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research-article

Numerical Evaluation of Thermal Hydraulic Performance in Fin-and-Tube Heat Exchanger with Different Vortex Generator Geometry and Arrangement

[+] Author and Article Information
Mohd Fahmi Md Salleh

Faculty of Mechanical Engineering, Universiti Teknologi MARA, Cawangan Johor, Kampus Pasir Gudang, Jalan Purnama, Bandar Seri Alam, 81750 Masai, Johor, Malaysia
afahmisalleh@uitm.edu.my

Ahmadali Gholami

High Speed Reacting Flow Laboratory, Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Bahru, Malaysia
bgholamifdg@gmail.com

Mazlan Abdul Wahid

High Speed Reacting Flow Laboratory, Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Bahru, Malaysia
cmazlan@fkm.utm.my

1Corresponding author.

ASME doi:10.1115/1.4041832 History: Received March 19, 2018; Revised October 24, 2018

Abstract

Vortex generator as secondary flow enhancement technique has captured the attention of many researchers recently to augment the performance of the fin-and-tube heat exchanger (FTHE). There are various vortex generator parameters that are influencing the thermal and hydraulic performance in the FTHE such as the geometry and arrangement. In present study, the effect of different vortex generator geometry and arrangement was investigated using numerical simulation method. There are three vortex generator geometry were studied including rectangular winglet (RWVG), delta winglet (DWVG) and trapezoidal winglet (TWVG). The vortex generators were placed behind tubes either in common flow down (CFD) or common flow up (CFU) arrangement. The introduction of vortex generators behind tubes resulted in heat transfer augmentation but come together with higher pressure drop penalty. Further analysis on the thermal performance has found that TWVG in CFU arrangement almost having similar thermal performance factor with respect to the baseline case at Reynolds number 500 and 600. However, the thermal performance factor for TWVG in CFU arrangement decreases as the Reynolds number further increased. For other vortex generator cases, lesser thermal performance factor was found than the baseline case.

Copyright (c) 2018 by ASME
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