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research-article

Optimization of corrugation height and angle of attack of vortex generator in the wavy fin-and-tube heat exchanger

[+] Author and Article Information
Wei Li

Fellow ASME, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China
weili96@zju.edu.cn

Tariq Amin Khan

Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China, Department of Energy Engineering, Collaborative Innovation Center of Advanced Aero-Engine, Zhejiang University, Hangzhou 310027, China
tariqamin4u@yahoo.com

Weiyu Tang

Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China; Department of Energy Engineering, Collaborative Innovation Center of Advanced Aero-Engine, Zhejiang University, Hangzhou 310027, China
tangweiyu@zju.edu.cn

W. J. Minkowycz

Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA
WJM@uic.edu

1Corresponding author.

ASME doi:10.1115/1.4040609 History: Received October 11, 2017; Revised May 07, 2018

Abstract

Wavy fins have been considered as an alternative of the straight fins in compact heat exchangers for better heat transfer performance which can be augmented by considering vortex generators. This work is related to numerical investigation and optimization of corrugation height of fin and angle of attack of delta type vortex generator in a wavy fin-and-tube heat exchanger. For this purpose three-dimensional Reynolds-averaged Navier-Stokes analysis and a multi-objective genetic algorithm with surrogate modeling is performed. Numerical simulation is carried out to study the effect of delta winglets with varying the corrugation height of wavy fin in a three rows of tubes with staggered tube arrangements. The corrugation height (H) and angle of attack (?) varies from 0.3mm to 1.8mm and 15o to 75o, respectively. Results are illustrated by investigating the flow structures and temperature contours. Results show that increasing corrugation height of wavy fin and angle of attack of delta winglet enhances the heat transfer performance of heat exchanger while friction factor is also increased. Employing delta winglets has augmented the thermal performance for all corrugation heights and superior effect is observed at a higher corrugation. To achieve a maximum heat transfer enhancement and a minimum pressure drop, the optimal values of these parameters (H and ?) are calculated using the Pareto optimal strategy.

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