Research Papers: Heat Exchangers

Numerical Study and 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
e-mail: weili96@zju.edu.cn

Tariq Amin Khan

Department of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China;
Co-Innovation Center for Advanced Aero-Engine,
College of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China
e-mail: tariqamin4u@yahoo.com

Weiyu Tang

Department of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China;
Co-Innovation Center for Advanced Aero Engine,
College of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China

W. J. Minkowycz

Department of Mechanical and
Industrial Engineering,
University of Illinois at Chicago,
Chicago, IL 60607

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 11, 2017; final manuscript received May 7, 2018; published online July 23, 2018. Assoc. Editor: Danesh K. Tafti.

J. Heat Transfer 140(11), 111801 (Jul 23, 2018) (11 pages) Paper No: HT-17-1596; doi: 10.1115/1.4040609 History: Received October 11, 2017; Revised May 07, 2018

Wavy fins have been considered as an alternative of the straight fins in compact heat exchangers (CHEs) for better heat transfer performance, which can be augmented by considering vortex generators (VGs). This work is related to numerical investigation and optimization of corrugation height of fin and angle of attack of delta winglet type VGs in a wavy fin-and-tube heat exchanger. For this purpose, three-dimensional (3D) Reynolds-averaged Navier-Stokes analysis and a multi-objective genetic algorithm (MOGA) with surrogate modeling are performed. Numerical simulation is carried out to study the effect of delta winglets with varying the corrugation height of wavy fin in three rows of tubes with staggered tube arrangements. The corrugation height (H) and angle of attack (α) vary from 0.3 mm to 1.8 mm and 15 deg to 75 deg, respectively. Results are illustrated by investigating the flow structures and temperature contours. Results show that increasing the corrugation height of wavy fin and angle of attack of delta winglets 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 α) are calculated using the Pareto optimal strategy. For this purpose, computational fluid dynamics (CFD) data, a surrogate model (neural network), and a multi-objective GA are combined. Results show that optimal orientation of delta winglets with respect to corrugation height can improve both the thermal and hydraulic performance of the heat exchanger.

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Fig. 1

Model and relevant geometric parameters of wavy-fin and tube heat exchanger with delta winglets

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Fig. 2

The combined flow chart of CFD, ANN and MOGA

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Fig. 3

Grid on fin and around delta winglet

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Fig. 4

Validation of numerical model with experimental results for (a) Colburn factor and (b) friction factor

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Fig. 5

Secondary flow and velocity contours for (a) H = 0.6 mm and (b) H = 0.6 mm

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Fig. 6

Temperature contours in the middle Y-plane for (a) H = 0.6 mm and (b) H = 1.8 mm

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Fig. 7

Colburn factor and friction factor as a function of corrugation height

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Fig. 8

(a) Angle of attack versus Colburn factor and (b) corrugation height versus Colburn ratio

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Fig. 9

(a) Angle of attack versus friction factor and (b) corrugation height versus friction ratio

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Fig. 10

Pareto optimal front of Colburn and friction factors by MOGA

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Fig. 11

Performance comparison of optimal design with plane wavy fins



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