Experimental insights into heat transfer mechanisms in a turbulent channel flow with inclined V-shaped baffles

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Published: Jan 30, 2026
Keywords:
Heat transfer coefficient Inclination angle V-shaped baffles Thermal-hydraulic performance

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P. Thapmanee
Department of Process and Industrial Engineering, School of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok, 10530, Thailand
C. Homniam
Department of Mechanical Engineering, School of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok, 10530, Thailand
A. Phila
Department of Mechanical Engineering, School of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok, 10530, Thailand
W. Keaitnukul
Department of Process and Industrial Engineering, School of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok, 10530, Thailand
S. Eiamsa-ard
Department of Mechanical Engineering, School of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok, 10530, Thailand
N. Maruyama
Engineering Innovation Unit, Graduate School of Regional Innovation Studies, Mie University, Mie, 514-8507, Japan. Department of Mechanical Engineering, Faculty of Engineering, Mie University, Mie, 514-8507, Japan.
M. Hirota
Department of Mechanical Engineering, Faculty of Engineering, Aichi Institute of Technology, Aichi, 470-0392, Japan
K. Buanak
Department of Automotive-Mechanical Engineering, Faculty of Industrial Technology, Rajabhat Rajanagarindra University, Chachoengsao, 24000, Thailand

Abstract

This study conducts an experimental analysis of heat transfer and pressure drop in a solar air preheater channel with an aspect ratio (AR) of 3.75:1, featuring inclined V-shaped baffles (I-VB) on one wall under continuous heat flux circumstances. The study focuses on the effects of the inclined angles on the heat transfer coefficient (h), pressure drop (DP) and thermal-hydraulic performance (THP). The inclined angles (q) explored include 0°, 45° and 90°, with attack angles (a) set at 45°, and Reynolds numbers (Re) varying from 6000 to 24,000. The experimental results show that the inclined angles significantly affect the temperature distribution, Nusselt number distribution, friction factor, and thermal-hydraulic performance. The heat transfer rates in channels with inclined V-shaped baffles (I-VB) at inclined angles of 0°, 45° and 90° are 13.95-53.46%, 165.29-361.08%, and 175.91-378.34% higher than those in a smooth channel, respectively. However, the corresponding pressure losses increase by 2.01-2.87, 10.42-13.37, and 15.03-19.91 times for these inclined angles. At all Reynolds numbers, the inclined V-shaped baffles with an inclined angle (θ) of 45° demonstrate superior thermal-hydraulic performance, reaching a peak value of 1.94 at a lower Reynolds number of 6000.

Article Details

How to Cite
Thapmanee, P., Homniam, C., phila, arnut, Keaitnukul, W., Eiamsa-ard, S., Maruyama, N., Hirota, M., & Buanak, K. (2026). Experimental insights into heat transfer mechanisms in a turbulent channel flow with inclined V-shaped baffles. Journal of Research and Applications in Mechanical Engineering, 14(1), JRAME–26. retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/258727
Issue
Vol. 14 No. 1 (2026)
Section
RESEARCH ARTICLES
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