Heat transfer enhancement in a fin and tube heat exchanger with isosceles vortex generators

被引:17
作者
Sahel, D. [1 ]
Benzeguir, R. [1 ]
Baki, T. [1 ]
机构
[1] Univ Sci & Technol Oran, Fac Mech Engn, Gas Fuels & Environm Lab, USTO MB, BP 1505, El Mnaouer 31000, Oran, Algeria
来源
MECHANIKA | 2015年 / 06期
关键词
Fin-and-tube; heat exchanger; heat transfer; isosceles vortex generators; winglets; FLOW VISUALIZATION; PRESSURE-DROP; FLUID-FLOW; PERFORMANCE; SIMULATION; WINGLETS; ARRAYS;
D O I
10.5755/j01.mech.21.6.12240
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
A numerical study was carried out to analyze the thermal and dynamic performances of fin-and-tube heat exchanger provided with vortex generators (VGs) presented in this work. The VGs presented as a new design of isosceles shape of attack angles alpha = 0 degrees (Simple vortex generator), 5 degrees, 10 degrees, 15 degrees, 25 degrees, 35 degrees and 45 degrees. The computations based on a finite volume method with the SIMPLE algorithm have been conducted for the air flow in terms of Reynolds numbers ranging from 400 to 800. The heat transfer coefficients and pressure losses presented in terms of Nusselt number (Nu) and pressure difference (61)), respectively. The results show that the isosceles vortex generator (IVG) of alpha = 0 degrees presents an encouraging increase in heat transfer coefficients by 95%, and a moderate pressure drop penalty tend to 2.8 times compared with the Baseline case (tube without VGs), respectively. In addition, the IVG of alpha = 0 degrees assured the highest factors of thermal performance vary between 2.1 and 2.15 depending on the Reynolds number values.
引用
收藏
页码:457 / 464
页数:8
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