Influence of shape factor and notch design of transverse trapezoidal shaped rib on thermal performance of solar air heater-a CFD study

M. S. Manjunath, Gaurav Pal Singh, N. Akhil, Atul Singh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Solar air heaters generally exhibit lower levels of thermal performance due to thermal losses and poor heat transfer characteristics of air. One of the commonly used techniques for performance improvement is to enhance turbulence levels in the flowing air stream. This paper presents the computational fluid dynamics analysis on the influence of trapezoidal rib shape factor and notch on the overall thermal behavior of solar air heater at constant heat flux conditions. The simulation is conducted for different Reynolds number varying from 11000 to 25000. The rib shape factor is varied as 1.71-8.85 for a fixed rib height value of 1.4âmm. The results reveal that lower values of shape factor improve heat transfer by about 13.1% for the rib shape factor of 2.42 while lower values of shape factor produce increased pressure drop by about 31% on an average for the rib shape factor of 1.71. The presence of notches create additional peak Nusselt number locations which however is negated by the presence of entrapped smaller eddies which effectively result in marginal improvement in heat transfer relative to the notchless rib irrespective of the geometry of notch. It is concluded that the suitable design modification of notches is essential to overcome the hot spots in order to take advantage of the concept of notch on ribs to achieve improved thermal characteristics.

Original languageEnglish
Title of host publication2nd International Conference on Mechanical Materials and Renewable Energy, ICMMRE 2019
EditorsXiao-Zhi Gao, Ranjan Kumar Ghadai, Kana Kalita, Ishwer Shivakoti, Erol Kilickap, Tanmoy Kundu, Soham Das
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440036
DOIs
Publication statusPublished - 02-11-2020
Event2nd International Conference on Mechanical Materials and Renewable Energy, ICMMRE 2019 - East Sikkim, India
Duration: 06-12-201907-12-2019

Publication series

NameAIP Conference Proceedings
Volume2273
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference2nd International Conference on Mechanical Materials and Renewable Energy, ICMMRE 2019
CountryIndia
CityEast Sikkim
Period06-12-1907-12-19

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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