Assessment of twist tape thermal performance in heat transfer passive augmentation technique
Beni-Suef University Journal of Basic and Applied Sciences volume 11, Article number: 29 (2022)
Processing processes such as petrochemical, refineries, pharmaceutical, thermal, chemical, and integrated chemical industries such as the food, dairy and sugar industries have been widely used for heat exchange. Additional techniques have been used in the formulation of various twist geometry gestures such as helical film, triangular/rectangular/trapezoidal tape, HiTrain wire matrix mould, a novel turbulator with a diameter (p/d), well placed/separated broken twisted tapes, conic splitting, and other geometric tapes are well researched with Reynolds number range 13–500,000 liquid processing solutions such as ethylene glycol and turbine oil respectively. This paper also highlighted the impact of circular holes, rectangular holes, angle of entry, wavy rate and tape size in the optimal temperature parameter such as thermal enhancement factor 1.04–3 varies with Reynolds' number from 100 to 20,000. By test/numerical reading the curved ratio was calculated from 0.25 short lengths to 20 trapezoidal cuts with tape geometry through various reviews. The Jacobean matrix associated to the linear equation is given by,
Compared to a blank tube, the heat transfer rate and the friction factor improved by 20% when using full-length tapes y = 2.5, and NNu increased 9 times to y = 3.125. There is a 30–40% increase using different twisted tapes. This in-depth study is common use in industrial systems to gain power.
Conduction, convection and radiation are the three mechanisms by which heat is transferred. A heat exchanger is a system that allows heat to be transferred between two fluids of different temperatures. It occurs when a hot fluid passes through a solid wall separating two cold fluids due to a temperature difference.
Heat exchangers are commonly used in process industries for heating and cooling in evaporators, refrigerators, and other similar devices. Energy conservation is a hot subject in the heat exchanger industry these days . As a result, it is essential to improve heat transfer in heat exchange equipment while minimising costs and conserving electricity. Passive augmentation methods using twisted tape are used in this case. In a Double Pipe Heat Exchanger, heat transfer enhancement would be achieved in the tube side, which is equipped with full-length twisted tapes inserts in laminar flow.
Heat exchangers are used in a variety of manufacturing and engineering settings. The design of heat exchangers is very complicated, as it necessitates an exact study of heat transfer rate and pressure drop estimates, as well as considerations such as long-term efficiency and cost. The most difficult aspect of designing a heat exchanger is making it compact and achieving a high heat transfer rate with minimal pumping capacity. Heat transfer enhancement techniques are useful in a variety of engineering applications. The high cost of energy and materials has resulted in an increased effort to produce more reliable heat exchange equipment in recent years. Furthermore, augmentation of heat transfer is often needed for miniaturization of a heat exchanger in specific applications, such as space applications. Heat transfer enhancement is a subject of great interest to researchers because it results in energy and cost savings. Heat transfer in channels has a wide range of applications in process industries and engineering. Various augmentation methods are used to strengthen traditional heat exchangers, with a focus on various forms of surface enhancement. The augmentation surface can have one or more of the following conditions that favour an increase in heat transfer rate while causing an undesirable increase in friction. [2,3,4,5,6,7,8,9,10,11]:
Increased turbulence intensity and disruption of boundary layer growth.
Increased surface area for heat transfer.
Swirling/rotating/secondary flow generation.
1.1 Augmentation techniques
Since there is no cross mixing of the fluid in a laminar flow, heat transfer is primarily by conduction and molecular diffusion. There were also natural convection currents. With the exception of liquid metals, the thermal conductivities of the fluids were mild. As a result, laminar flow heat transfer coefficients were generally poor.
As a result, larger heat transfer whereas will be needed for a given heat transfer rate when compared to turbulent flow heat transfer situations. As a result, in some cases, an augmentative scheme is needed to meet the size constraints placed on and to ensure efficient operation .
In many engineering applications, good thermal efficiency of the heat exchanger or thermal systems is needed, and numerous methods to improve the heat exchanger in the system have been developed and widely used shown in Table 1. The following conditions are created by these techniques to improve the heat exchanger rate:
Increasing the surface area for heat transfer.
Spinning and/or secondary flow generation.
Disruption of boundary layer formation and increased turbulence in the flowing fluid.
The following three methods Fig. 1 are commonly used to improve heat transfer in Heat Exchanger:
lopina and Bergles  is completed an analysis in which water is utilized a liquid single stage with twisted tapes embed in roundabout cylinder Heat exchanger. They utilizes full length tapes with twist ratio 2.5–9.2. Because of this stream way are expanded. In these they utilized a NRe < 8 × 103 to 1.3 × 105. By utilizing twisted tapes there is an expansion in stream way which prompts dissemination way. Heat transfer rate and friction factor has improved by 20%.
They used full length twisted tape with a y = 3.125 tape insert, according to Hong and Bergles . Water and ethylene glycol were used as fluids, with Nre ranges of 83–2460 and 13–390, respectively. When the Nre is big, tape twist has an effect on friction. The Nusselt number of a tube without twisted tapes was found to be 9 times that of a tube with twisted tapes.
Ray and Date  used full length twisted tapes with a twist ratio of 1.5 < y < 10 in a square duct for NRe < 1100, with water as the fluid for the experiment, 1 < NPr < 50. They include Nusselt number and friction factor correlations. A square duct has better hydrothermal efficiency than a circular duct.
Gaitonde and Saha  Experiments on turbulent flow in circular tubes of regularly spaced twisted tapes with a factor of 3.18 < ∞. They discovered that full length twisted tapes perform better than regularly spaced twisted tapes for NRe 5000–43,000.
Dutta and Saha  Laminar flow in circular tubes with regularly spaced twisted tapes with twist ratios ranging from 2.50 to 5. They discovered that full length twisted tapes perform better than regularly spaced twisted tapes for NRe 45–1150.
Suden and Wang  In circular tubes with twist ratios of 3, 4.5, and 6, for NRe 300–30,000, a comparison was made between twisted tapes and wire coil inserts.
Study of heat transfer enhancement in circular tubes with different inserts, with twist ratios ranging from 5.2 to 3.4, by Kapatkar and Padalkar . They discovered that the friction factor with tapes inserts was 340–750% higher than smooth tubes for NRe 200–2000.
Klaczak  The use of twisted tape inserts with twist ratios ranging from 1.62 to 5.29 improves heat transfer. They discovered that low pitch twist tapes have the highest effectiveness for NRe 110–1500.
Sita Rama Raju and Naga Sarada  They investigated heat transfer enhancement using varying width twisted tape inserts with twist ratios of 3, 4 and 6 for NRe 6000–13,500, having different widths. They discovered that as compared to plain tube, there is a 30–40% improvement.
Greetings, Khalil et al.  investigate the use of twist tapes with a twist ratio of 2.77 and variable width to improve heat transfer. 690–2195 NRe They discovered that without twist tape, the total enhancement ratio is 575%.
Agarwal and Raja Rao  Heat transfer augmentation in circular tubes using twisted tape inserts with twist ratios of 2.41–4.84 for NRe 70–4000. The friction factor was found to be 3.13–9.71 times that of simple tubes.
Heat transfer enhancement using twisted tape in square duct by Fenget al. . 3, 4 and 5 twist ratios They discovered a 5% deviation in average heat transfer when compared to experimental results.
Chaedir et al.  Heat transfer in a helical tube with twisted tape inserts of 3.15, 7.86 and 15.73. They discovered that for NRe 100–2000, the NPr enhancement ratio is higher at NRe 500–1000.
Lim and Hung  Using twisted tapes, evaluate swirl flow in a heat exchanger. Twist ratios of 2.5, 4, and 6 They developed a NNu correlation accuracy of about 15% for NRe 450–1350.
External power is used in active techniques to promote the desired flow adjustment and the resulting increase in heat transfer rate. Stirrers, surface vibration, fluid pulsation, and other methods can be used to improve heat transfer in this process. Passive strategies do not need any external power; instead, they draw power from the device itself, resulting in an increase in pressure drop. Surface or geometrical changes to the flow channel, such as inserts or external devices, are often used. The term compound method refers to a technique that combines active and passive elements. The heat transfer enhancement provided by this technique is obviously greater when both passive and active techniques are used individually. However, incorporating this technique into thermal systems requires complex designs, high maintenance, and is not cost efficient [47, 48].
1.2 Functioning of twisted tape
Eiamsa-ard and Promvonge  has been discovered that improving heat transfer with a passive method using various forms of helical tape construction in the inner tube of a concentric double pipe heat exchanger Fig. 2 will significantly increase the heat transfer rate. In contrast to the simple tube, the maximum mean Nusselt number for the full-length helical tape with centered-rod, 150% for the full-length helical tape without rod, and 145% for the regularly-spaced helical tape, s = 0.5, can be increased by 160%. The swirling flow caused by the secondary flows of the fluid may explain the increased heat transfer and pressure decrease.
Yaningsih and Wijayanta  Modifications that are popular (T-Tri, T-Rec, and T-Tra) are twisted tape inserts Fig. 3 with triangular, rectangular, and trapezoidal wings (T-Tri, T-Rec, and T-Tra) with alternate axes that have higher heat transfer than TT. This is due to a combination of the alternative axes' flow fluid and the wings' proposed additional turbulence near the pipe's wall. The Nusselt numbers, friction factor, and thermal efficiency factor for T-Tra were the largest, followed by T-Rec and T-Tri. As inserts T-Tra is used, the highest value of thermal efficiency factor was 1.44, while the amount of friction factor and Nusselt increased to 1.91 and 5.2 times, respectively, as compared to a plain tube.
Raman Bedi et al.  according to experimental findings, a good swirl generator should have a higher heat transfer coefficient, lower pressure drops, and a lower friction factor. hiTrain wire matrix Fig. 4 meets all of these criteria. The simplicity of design and fabrication is one of the reasons for the widespread use of twisted tape. HiTrain wire matrix fabrication is more difficult due to the varying loop density and strength per foot length. The loops in the hiTrain wire matrix shear the fluid flow at lower Reynolds numbers (Laminar flow), resulting in a higher heat transfer coefficient, lower pressure decrease, and lower friction factor. Swirl and recirculation zones are created by twisted tape and twisted tape with baffles, resulting in increased pressure and friction. Experiments with nano-fluid as additives should be applied to the turbulent area to investigate the fluid flow properties of twisted tape baffles and hiTrain wire matrix.
Nalavade et al.  the most important factors in this analysis, Nu and f, both increase as the pitch to tube diameter ratio (p/d) decreases. The CFD simulation results show that the novel turbulator with (p/d) 0.54 and a 90° angle of twist performs better, with TPF ranging from 1.28 to 1.43 and PEC ranging from 0.95 to 1.27 over the Reynolds number range tested. CFD simulation was used to investigate the impact of variations in twist angle. The heat transfer rate increases as the angle of twist decreases. The results show that as the angle of twist decreases, both the Nusselt number and the friction factor increase. The turbulator Fig. 5 with a pitch-to-diameter ratio (p/d) of 0.54 and a 30° twist angle (θ) performs better. The friction factor is 4.94–5.71 times that of the smooth tube, and the TPF is 1.43–1.60 times that of the smooth tube.
Al-Fahed et al.  the data shows a modest improvement in both heat transfer and pressure drop coecients for the microfin tube evaluated in this paper over the plain values. For laminar low conditions, this form of microfin is not recommended. According to the heat transfer results, twisted-tape inserts are an effective method for increasing heat transfer. The heat transfer rate rises as the twist ratio rises. The twist ratio had a direct relationship with the effect of width. The tight-fit tape provides higher heat transfer values than the loose-fit tape for twist ratios of 3.6 and 5.4. The loose-fit geometry Fig. 6 has a higher heat transfer value than the tight-fit geometry for y 7.1. To improve heat transfer in laminar flow, Bhattacharyya  provided numerical friction factor and Nusselt number results. As swirl flow, a square channel with angular cut wavy tape is used.
1.3 Comprehensive study of twisted tape parameter to affect the energy transfer
Bhuiya et al.  investigated the heat transfer and friction factor characteristics of flow through a circular tube in a turbulent area using twisted tape of various porosities.
Aldali et al.  Comprehensive investigation of heat transfer and pressure drop for laminar flow in an inner circular tube, taking into account twist ratio and twist tape thickness.
Lui et al.  published a systematic study on the passive augmentation technique for heat transfer enhancement in pipe heat exchangers. The results of comparative experiments on twisted tape of various configurations and geometries have been discussed. The effect of wire coils, wings, swirl flow, fins, and a conical ring on heat transfer thermal efficiency factor was also addressed.
Eiamsa et al.  carried out an experimental study on the thermal efficiency of a tube heat exchanger with twisted tape coupling (co-coupling and counter coupling) configuration. Also, look into the effect of the coupling width ratio and twist ratio on the exchanger's thermal efficiency.
Salam et al.  used a circular tube with a rectangular cut twisted tape insert to test tube side water fluid in turbulent flow. The friction factor, heat transfer coefficient, and enhancement efficiency have all been studied.
Skullong et al.  investigated the same twist ratio (TR = 4) in a coupled co-twistred tape with V-shaped ribs in the edges. The work was done in a round tube using V-ribs twist tape as a vertex generator in a turbulent flow with air as the fluid.
Ariwibawo  investigated the heat transfer coefficient and heat load effectiveness of a hairpin heat exchanger with twisted tape.
Durga Prasad  investigated the Al2O3/water nano-fluid U-tube heat exchanger with trapezoidal cut twisted tape insertion experiments.
Under a uniform heat flux condition, Eiamsa-ard et al.  investigated the effect of perforated helical twisted tape on heat transfer, thermal efficiency, and friction characteristics.
In the transitional flow regime for circular tubes, Meyer and coworkers  investigated heat transfer and pressure drop with twisted tape insert and square edged inlet. Experiments were carried out using Reynold numbers 400–11,400 and various twist ratios.
Heat transfer parameters performance and turbulent forced convection in circular pipe using modified twisted tape were recorded by Boonloi and coworkers . To minimise pressure drop, the general twisted tape is punched with a rectangular hole. The effect of hole size and twist ratio on numerical data in the chaotic regime for single and double tape has been investigated.
In a research on the thermal efficiency of twist tape adjusted with different conical cut inserts in laminar flow, Salman et al.  presented a comparative study. Twist tapes with quadrant, parabolic half, and triangular cuts were used to maintain the same twist ratio across the cut depth.
Patil et al.  used several twist tape inserts to investigate the efficiency of heat transfer parameters in circular pipes with co-swirl and counter-swirl orientations. The experiment involved single, twin, and four twisted tapes with different twist ratios.
Using uniform/non-uniform twisted tape inserts in tube side with alternate axis, Eiamsa-ard  established empirical correlation for heat transfer characteristics evaluation criterions. In addition, the heat transfer rate of the presented uniform twisted tape alternate axis with smaller length is higher than the larger one.
Experimental investigation by Azmi  to investigate the enhancement effect in flat plain tube along co and counter twisted tape.
In the simple tube, Bhattacharyya et al.  numerically investigated heat transfer with twisted tape at different angles of 180°, 160°, and 140°. The predicted outcome was used to boost the solar heater's heat rate.
Hung et al.  test the output of twisted tape in a laminar flow in a heat exchanger using two separate condition variables and continuous pumping power as measurement criteria. The heat duty ratio, Nusselt number, effective ratio, and heat transfer efficiency of twist tape inserts were all examined.
The output of an absorber tube with an oblique delta-winglet twisted tape insert with twist ratios of 1, 2, 3, 4 within the Reynolds number range of 3000–9000 was investigated by Rawani et al. .
In a shell and tube heat exchanger, Gui et al.  conducted an experimental study on oil flowing in transfers groove tubes with twisted tape geometry as continuous tape, discontinuous tape, and perforated tape.
2 Main text
2.1 Basic parameters and equations
Boundary layer concept: The component of a moving fluid in which the fluid motion is influenced by a rigid boundary is known as the boundary layer. When a uniform velocity fluid flow enters a pipe, fluid layers adjacent to the walls slow down as they would on a plane surface, and a boundary layer forms at the entry.
Thermal boundary layer: Assume that a continuous stream of fluid is flowing parallel to the plate. Assume that the stream entering the plate has a velocity and temperature Too, and that the plate's surface temperature Tw remains unchanged. Assume Tw is greater than the amount of fluid heated by the pan. Figure 7 shown boundary layer forms. The velocity of the outer boundary layer ranges from u = 0 at the wall to u = uo at the outer boundary layer. The hydrodynamic boundary layer, denoted by line OA, is a type of boundary layer. The temperature of the fluid near the plate's surface is changed by heat transfer from the plate to the fluid, resulting in a temperature gradient. The temperature gradient is also layer nere to the wall, and the temperature inside the layer ranges from Tw at the wall to T at the layer's outside boundary. The thermal boundary layer is the name given to this layer.
It's the ratio of four times the conduit's cross sectional area to the wetted perimeter in the test section.
The hydraulic diameter (Dh) of a plain tube can be calculated as follows:
It's the inertial force to Viscus force ratio, and it's dimensionless. The flow geometry and Reynolds number influence the fluid's behaviour in terms of heat transfer characteristics.
Reynolds number is defined mathematically as,
In a fluid, it is the ratio of convective to conductive heat transfer. The increase in Nusselt number indicates improved convectional heat transfer.
The local Nusselt number for a plain tube can be defined as,
Since the insert provides resistance to fluid movement through the tube, the pressure drop would be higher than if the tube were not inserted. Pumping capacity would also be higher than it would be for a tube without an insert. The pressure drop, mass flow rate, and density of the air passing through the tube all play a role.
2.2 Swirl flow device
Swirl flow or secondary flow circulation on axial flow in a channel is generated by these. Swirl flow devices Fig. 8 include helical twisted tape, twisted ducts, and various types of alternative.
insert having 0.5 mm width 
Pitch: Linear distance between two twists, denoted by ‘H’.
Twist ratio: It is the ratio of twist tape pitch to tube within diameter, denoted by the letter ‘y'. This is dimensionless term .
The number of revolutions: The number of 360° revolutions of twisted tapes is denoted by N.
The swirl parameter (Sw), which is defined as, describes the strength of the secondary motion induced by the twisted tape .
Heat transfer enhancement
In heat exchanger, heat transfer between a wall and the fluid is given by
The ratio of (\(hA\)) augmented surface to that of plain surface is defined as enhancement ratio. Denoted by E.
The heat transfer enhancement ratio divided by the friction factor ratio yields the overall enhancement ratio. This parameter is often used to compare various passive strategies, allowing two different approaches for the same pressure drop to be compared. The overall enhancement ratio is calculated as follows :
Constant pumping power is used to test it. R stands for performance parameter. At constant pumping power, it is known as the ratio of Nusselt number for twisted tape to that of plain tape.
To expand the mathematical model, we look at this simple idea to do the following:
Merchant performance in a consistent state governing.
Transmission of heat to the environment is ignored.
HE is considered to be a system with illuminated parameters.
Two flows in the liquid phase and does not change the phase.
By taking heat balance of hot and cold fluid, we get,
The heat exchanger's mathematical model has been constructed, and it includes a heat balance equation for the two material fluxes Qh and Qc, as well as an expression for transferred heat flow. The overall heat exchange coefficient, U, has a standard expression as the overall HTC, which may be given by Eq. (3), for the heat flow transported in the heat exchanger.
2.4 Experimental/numerical studies on passive technique using twisted tape
With an increase in pressure drop, twisted tape increases the heat transfer coefficient. Complete-length twisted tape, short length twisted tape, full length twisted tape with varying pitch, reduced width twisted tape, and regularly spaced twisted tape are all examples Table 2 of twisted tape have already been configured.
Different researchers have used different output ratios for multi-tube heat exchangers ,
The friction factor, f, and the Stanton number, St, without the subscript, refer to the rough surface, while the subscript, s, refers to the smooth surface. When heat transfer between two fluids is considered, the ratio of heat transfer coefficients for rough and smooth surfaces, h/hs, in (14) is replaced by the ratio of total heat transfer coefficients, U/Us. The heat transfer coefficient hs or Us in (14) is calculated for smooth surfaced tubes at the Reynolds number Res, which is determined by (16).
Where Nu0 and f0 are the Nusselt number and friction factor of the plain tube, respectively, the PEC  is defined as follows:
The numerical simulation was used to calculate the PEC in a tube of triple or quadruple twisted tapes. For all twisted tapes, it was discovered that the PEC value rises as the Reynolds number rises. Tubes with twisted tapes of clearance ratio a* = 0.35 perform better in terms of total heat transfer than tubes with twisted tapes of other clearance ratios.
The highest level of thermal performance factor [71, 100], which have a measure of heat transfer augmentation, have one of the main parameters in heat exchanger design, as shown by variations of overall enhancement efficiency (η) against Reynolds number for different twist ratios at constant entrance angle 180°. In comparison to entrance angle (α = 160° and 140°), the percentage increase in enhancement factor for entrance angle (α = 180°) twisted tapes was around 17% and 46%, respectively.
The thermo-hydraulic output parameter (η)  was found to be efficient from an energy standpoint and enhancement efficiency was greater than unity for the entire computational investigation on angular cut wavy tape of different twist ratios. In the low laminar area, angular cut wavy tape with a wavy ratio of y = 1.0 and β 45° angle was far more dominant than the other tapes measured. Also, as the Reynolds number rises, angular cut wavy tape with a wavy ratio of 3.0 and β 45° angle shows some promise. The effect of heat transfer enhancement due to the wavy tape was more dominant than the effect of increasing friction, and vice versa, according to the enhancement efficiency above unity.
According to the review, the passive method heat transfer augmentation techniques using twist tape could result in secondary swirl flow generation. The thermal enhancement factor has increased as the twist ratio has decreased, but this is dependent on the geometry of the tape. The increased heat transfer and pressure decrease may be explained by the swirling flow caused by the secondary flows of the fluid. This type of microfin is not recommended for laminar low conditions.
The turbulence near the pipe's wall was increased by a combination of the alternate axes' flow fluid and the wings' turbulence. A successful swirl generator should have a higher heat transfer coefficient, lower pressure drops, and a lower friction factor, according to experimental findings in Fig. 9 and Table 3 sumerized for laminar flow region. The Nusselt number and the friction factor increase as the angle of twist decreases. As a consequence, when compared to turbulent flow heat transfer situations, larger heat transfer whereas will be needed for a given heat transfer rate. In comparison to plain tube, heat transfer rate and friction factor improved by 20% when full length tapes y = 2.5 were used, and NNu increased by 9 times at y = 3.125. There is a 30–40% increase by using different width twisted tape inserts.
In terms of output, twin counter-twisted tapes outperform twin co-twisted tapes. On twisted tape in different configurations and geometries, the findings of comparative studies have been discussed. It was discovered that the PEC value increases as the Reynolds number increases for all twisted tapes. In terms of overall heat transfer, tubes with twisted tapes of clearance ratio 0.35 outperform tubes with twisted tapes of other clearance ratios.
Availability of data and material
Data sharing not applicable—because of an article describes entirely theoretical research. All available data generated or analysed during this study are included in this published article. Figure source data are provided through references: See in Reference section. https://aip.scitation.org/doi/abs/10.1063/1.4968258. https://iopscience.iop.org/article/10.1088/1757-899X/376/1/012003. https://coek.info/pdf-pressure-drop-and-heat-transfer-comparison-for-both-microfin-tube-and-twisted-ta.html. Figures 3 and 9 drawn or prepare by author.
- T :
- u :
- D :
- h :
Heat transfer coefficient (Wm−2 K−1)
- k :
Thermal conductivity (Wm−1 K−1)
- ΔP :
Pressure drop (Pa)
- m :
Mass flow rate (kg s−1)
- Q :
Heat transfer rate (W)
- A :
Surface area (m2)
- E :
- f :
- u :
Viscosity (m s−1)
- ρ :
Density (kg m−3)
- η :
Overall enhancement ratio
Computational fluid dynamics
Thermal performance factor
Performance evaluation criterion
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Dehankar, P.B., Joshi, K., Bhosale, V.A. et al. Assessment of twist tape thermal performance in heat transfer passive augmentation technique. Beni-Suef Univ J Basic Appl Sci 11, 29 (2022). https://doi.org/10.1186/s43088-022-00208-0