Augmented artificially roughened solar air heaters. (2022)

• Record Type: Journal Article
• Authors: Yadav, Anil Singh; Agrawal, Abhay; Sharma, Abhishek; Sharma, Sachin; Maithani, Rajesh; Kumar, Anil
• Is Part Of: Materials today. Volume 63:(2022)
• Page Start: 226
• Page End: 239
• Publication Date: 2022
• Subjects: Solar air heater -- Solar energy -- Nusselt number -- Friction factor -- Roughness; B/S Relative roughness length -- d/D relative print diameter -- d/w Relative gap position -- e Roughness height (m) -- e/Dh Relative roughness height -- e+ Roughness Reynolds number -- g/e Relative gap width -- g/p Relative groove position -- Gd /Lv Relative gap distance -- h Heat transfer coefficient (W/m2K) -- HTC Heat transfer coefficient -- HTEF Heat transfer enhancement factor -- L/e Relative long way length -- l/s Relative length of metal grit -- LWLM Long way length of mesh -- P Pitch of roughness (m) -- P/e Relative roughness pitch -- PD Pressure drop -- S/e Relative short way length -- SWLM Short way length of mesh -- THP Thermohydraulic performance -- W/H Duct aspect ratio -- W/w Relative width -- Ф Rib chamfer/wedge angle (degree) -- α angle of attack (degree); Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2022.02.548
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: The use of baffles, fins, ribs, and grooves in the solar air heater ( SAH ) improves heat transfer ( HT ). Various efforts were made to improve heat transfer rates through duct using these components. As a result, significant pressure drop has also been observed due to these components. This article attempts to describe and conclude experimental investigations on the influence of ribs with a variety of designs on heat transfer ( HT ) and fluid flow ( FF ). It also outlines prior developed Nusselt number ( Nur ) and friction factor ( fr ) correlations. This comparative review was done to comprehend the findings of various experiments on SAHs with varying absorber surface roughness. This study aims to investigate the effects of artificial roughness on the friction and heat transfer properties of the duct.