LAMINAR FLOW HEAT TRANSFER IN HELICAL OVAL-TWISTED TUBE FOR HEAT EXCHANGER APPLICATIONS

被引：5
作者：
Wahlquist, Scott [1 ]
Ali, Amir [1 ,2 ]
Yoon, Su-Jong [3 ]
Sabharwall, Piyush [3 ]
机构：
[1] Idaho State Univ, Pocatello, ID 83209 USA
[2] Ctr Adv Energy Studies CAES, Idaho Falls, ID USA
[3] Idaho Natl Lab, Idaho Falls, ID 83415 USA
来源：
FRONTIERS IN HEAT AND MASS TRANSFER | 2022年 / 18卷
关键词：
Oval-twisted; helical tube; advanced heat exchangers; vorticity; enhancement performance factor; TRANSFER ENHANCEMENT; PRESSURE-DROP; COILED-TUBE; CONVECTION; WALL;
D O I：
10.5098/hmt.18.35
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The heat transfer performance of a novel tube configuration that combines the swirling velocity induced by oval-twisting and secondary flow generated by a helical geometrical flow path is presented. The Nusselt number (Nu) and friction factor ( f) are compared for the laminar flow regime (Re = 250-2000) under isothermal wall conditions. Under the same flow and boundary conditions, the oval-twisted helical tube increased the Nu and slightly increased the f over the circular helical tube. The best performance with the highest Nu and lowest f occurs at the coil curvature ratio (d(h)/D) of 0.17. The quantified enhancement performance factor (eta) shows a 46 - 56% increase for the oval-twisted helical tube over the circular helical tube with d(h)/D = 0.17. Correlations for the Nu and f are developed and agreed with the numerical results: +/- 6% and +/- 5% for the Nu and f, respectively.
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页数：8
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