Analysis of the effect of perforation in multi-v rib artificial roughened single pass solar air heater: - Part A

A detailed study on Solar Air Heaters (SAHs) with single-pass roughening with plastic net perforated multi-V and continuous multi-V ribs was investigated and compared for its effectiveness. Improvements in the Nusselt number ratio (Nu/Nus) and the friction factor ratio (f/fs) studied with the Reynol...

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Bibliographic Details
Published in:Experimental heat transfer 2023-02, Vol.36 (2), p.163-182
Main Authors: Singh, Varun Pratap, Jain, Siddharth, Gupta, JML
Format: Article
Language:English
Subjects:
Air heaters
Angle of attack
Aspect ratio
Fluid flow
Friction factor
multi-V ribs
Parallel flow
perforation
Reynolds number
Roughening
Roughness
Solar air heater
synthetic roughness
thermo-hydraulic performance
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Summary:A detailed study on Solar Air Heaters (SAHs) with single-pass roughening with plastic net perforated multi-V and continuous multi-V ribs was investigated and compared for its effectiveness. Improvements in the Nusselt number ratio (Nu/Nus) and the friction factor ratio (f/fs) studied with the Reynolds number (Re) ranged from 2000-18000 for a relative roughness height (e/Dh) of 0.043, a relative roughness pitch (P/e) of 10, an aspect ratio (W/H) of 12, and an angle of attack (α) of 60°, maintaining a similar flow scenario. For a syntactically roughened channel with a perforated multi-V rib, the significant enhancement was recorded in thermo-hydraulic performance with a slight decrease in pumping power. The study was extended to analyze the effect of perforation in a double pass parallel flow SAH.
ISSN:0891-6152
1521-0480
DOI:10.1080/08916152.2021.1988761