Thermal Visualization and Performance Analysis in a Channel Installing Transverse Baffles with Square Wings

Smith Eiamsa-Ard (), Arnut Phila, Khwanchit Wongcharee, Varesa Chuwattanakul, Monsak Pimsarn, Naoki Maruyama and Masafumi Hirota
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Smith Eiamsa-Ard: Division of System Engineering, Graduate School of Engineering, Mie University, Tsu 514-8507, Japan
Arnut Phila: Department of Mechanical Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand
Khwanchit Wongcharee: Department of Mechanical Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand
Varesa Chuwattanakul: School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Monsak Pimsarn: School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Naoki Maruyama: Division of Mechanical Engineering, Graduate School of Engineering, Mie University, Tsu 514-8507, Japan
Masafumi Hirota: Division of Mechanical Engineering, Graduate School of Engineering, Mie University, Tsu 514-8507, Japan

Energies, 2022, vol. 15, issue 22, 1-19

Abstract: The experimental examination of local heat transfer, thermal intensification, friction factors, and thermal performance factors (TPF) in a rectangular channel with square-winged transverse baffles (SW-TB) are presented in this paper. The purpose of this study is to modify the typical transverse baffles (TB) into square-winged transverse baffles (SW-TB) in order to improve the thermal performance and heat transfer rate of the channel. The effects of SW-TBs with various wing attack angles and Reynolds numbers on the heat transfer performance characteristics were examined using a thermochromic liquid crystal sheet. In the experiments, the SW-TBs were attached to the bottom wall of the channel, which had an aspect ratio (W:H) of 3.75:1. The SW-TBs had a width ( w ) of 150 mm, a square perforated cross-sectional area (a × b) of 8 × 8 mm 2 , and attack angles ( ? ) of 0° (solid transverse-baffle), 22.5°, 45°, 67.5°, and 90°. The bottom wall of the channel was evenly heated, while the other walls were insulated. The temperature contours on the heated surface were plotted using temperatures obtained through using the thermochromic liquid crystal (TLC) image-processing method. Experimental results revealed that the SW-TBs created multiple impinging jets, apart from the recirculation. At the proper attack angles ( ? = 22.5° and 45°), the SW-TBs offered greater heat transfer rates and caused lower friction losses, resulting in higher TPFs than the solid transverse baffles. In the current work, channels where the SW-TBs display a ? = 45° presented the greatest TPF, as high as 1.26. The multiple impinging jets issuing by the SW-TBs suppressed the size of the recirculation flow and allowed better contact between the fluid flow and channel wall.

Keywords: channel; heat transfer; square-winged transverse baffles; thermal performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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