From: Assessment of twist tape thermal performance in heat transfer passive augmentation technique
Wijayanta and Mirmanto [13] | Water | NRe 4500–18,500 | – | Short lenth twisted tapes inserts with twisted ratio 0.25, 0.5, 0.75 and 1 | The friction factor and NNu were found to be 0.51 and 2.84 times higher than the simple tubes, respectively |
Saha et al. [14] | Water | NRe 5000–43,000 | NPr 4–5.5 | Twist ratio is 3.18 to ∞ | Twist tapes that were spaced evenly were superior to full length twist tapes |
Kunlabud et al. [15] | Air | Nre 5000–15,000 | – | Twisted tapes With loose fit multi-channel | The simple tube's heat transfer rates have been improved |
Ahmadet al. [16] | Water | NRe 5000–16,000 | – | Swirling Perforated Twisted Tape Insert | Heat transfer is easier with partially perforated twisted tape than with completely perforated twisted tape |
Ganorkar and Warkhedkar [17] |  | NRe 5000–22,000 | – | Elliptical-cut twisted tapes inserts with twist ratio 8. And major- minor axis compositions 5, 4, 3.3, 3 and 2.5 | With a decreasing major to minor axis ratio, NNu and friction factor in the tube with elliptical-cut twisted tape increase |
Eiamsa-ard et al. [18] | Nanofluid TiO2/Water | NRe 5400–15,200 | – | Overlapped dual twisted tapes. With twist ratio 1.5, 2.0 and 2.5 | With decreasing overlapped twist ratio, Nusselt number and friction factor increased |
Yaningsih et al. [19] | Water | NRe 5400–17,500 | – | Twisted tape Twist tape ratio 3.97 and twisted tape with perforated axial pitch ratio 0.56, 0.87 and 1.19 | Twisted tape inserts with perforations have more successful than twisted tape inserts without perforations |
Yaningsih et al. [20] | Water | NRe 5400–17,350 | – | V cut twisted tapes insert with different width ratio 0.32, 0.38, and 0.48 | Heat transfer and thermal efficiency improve when the width is reduced |
Sivakumar and Rajan [21] | Water | NRe 5710–18,366 | – | Triangular cut twisted tapes twist ratio 5.4. And depth of triangular cut 1.2 cm | Triangular cut twisted tapes outperform plain twisted tapes by 1.1–1.3 times |
Yaningsih and Wijayanta [22] | Water | NRe 5800–18,500 | – | Twisted tapes using wing with diff axes Triangular-wing chord ratio 0.31 Trapezoid-wing span ratio 0.23 Twist ratio 3.8 | As compared to plain tube, the heat transfer rate increased by 1.91 times and the friction factor improved by 5.2 times |
Naga Sarada et al. [23] | Air | NRe 6000–13,500 | – | Twist tapes width from 10–22 mm. With twist ratio 3, 4 and 5 | Inserts boost heat transfer by 36–48% as compared to plain heat transfer for maximum width. It was 33–39% for reduced width |
Eiamsa-Ard [24] | Air | NRe 6000–20,000 | – | Circular-ring turbulators with pitch ratio (l/D = 1.0,1.5 and 2) and twisted tape with twist ratio 3, 4, 5 | When Pitch ratio 1 and Twist ratio 3 are combined, the effect is better than when they are used separately |
Abdolbaqi et al. [25] |  | NRE 7200–32,400 | – | Twin counter twisted tapes and twin co- twisted tapes with twist ratio 5, 10 and 15 | The heat transfer rate of counter twisted tapes was 22.5% higher than that of co twisted tapes |
Hong et al. [26] | Air | NRe 8000–22,000 | – | twin overlapped twisted tapes counter large and small combinations with twist ratio 1.06, 1.56, 2.44 and 3.22 | When the overlapped twisted ratio was reduced, NNu and friction factor increased |
Lopina and Bergles [27] | Water | NRe < 8 × 103 to 1.3 × 105 | – | full length twist tapes | The rate of heat transfer has accelerated by 20% |
Kreith and Sonju [28] | Water | NRe < 10 × 103 to 1 × 105 | – | Twisted tapes | Tube length tapes perform 25–45% better than full-length tapes |
Salam et al. [29] | Water | NRe 10,000–19,000 | – | Rectangular-cut (depth 8 mm and width 14 mm) twisted tape with twist ratio 5.25 | Twisted tapes with a rectangular cut improve performance by 2.3–2.9 times as compared to smooth tubes |
Liao and Xin [30] | Water, Ethylene glycol and Turbine oil | NRe 80–500,000 | NPr 5.5–590 | twisted tape and three dimensional extended surfaces | As compared to a smooth tube, a tube with three dimensional extended surfaces and twisted tape increased average NSt by 5.8 times |
Sivashanmugam and Suresh [31] | Water | NRe | – | Helical screw- tape insert with increasing and decreasing order | Empirical correlation is validated |
Arunachalam and Edwin[32] | Al2O3–Cu/water Hybrid nano fluid (Peclet number 2580to 11,780) | – | – | V-cut twisted tape inserts and plain twisted tapes inserts | Simple twisted tape inserts with V-cut twisted tape inserts have a better heat enhancement than plain twisted tape inserts. Hybrid fluid has a heat transfer coefficient of 25.8% higher than water |
Al-Fahed et al. [33] | Oil | – | – | Twisted tape with twist ratio 3.6, 5.4, 7.1 | Low twist ratio means less pressure drop and more heat transfer |
Ujhidy et al. [34] | Water | – | – | Twisted tapes | The flow structure was defined |
Sivanshanmug-am and Sunduram [35] | Water | – | – | Twisted tapes with twist ratio 8.54, 5.882, 4.95 and 4.149 | Tape-generated swirl flow has thermo-hydraulic characteristics. More efficient when the twist ratio is high |