Effect of downstream edge inclination of transverse rectangular chamfered ribs on heat transfer and flow characteristics of solar air heater - A CFD study

2022 ◽  
Author(s):  
G. K. Pramod ◽  
M. S. Manjunat
Keyword(s):  
Heat Transfer ◽  
Flow Characteristics ◽  
Solar Air Heater ◽  
Air Heater

Innovatively Arranged Curved-Ribbed Solar-Assisted Air Heater: Performance and Correlation Development for Heat and Flow Characteristics

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Rajneesh Kumar ◽  
Abhishek Singh Kashyap ◽  
Paramvir Singh ◽  
Varun Goel ◽  
Khushmeet Kumar
Keyword(s):  
Heat Transfer ◽  
Flat Plate ◽  
Roughness Element ◽  
Flow Characteristics ◽  
Solar Air Heater ◽  
Quasi Steady State ◽  
Air Heater ◽  
Relative Roughness ◽  
Flow And Heat Transfer ◽  
Gap Width

Abstract Solar radiation is a rich and clean source of energy. It can be collected and converted to thermal energy with the help of flat plate collectors called the solar-assisted air heater. Because of the low coefficient of heat transfer of air, the solar-assisted air heater has low thermal performance which can be improved by creating local turbulence using surface roughness on the heat transferring plate. The present investigation has been conducted to perceive the influence of the curved-ribbed element with gap on flow and heat transfer. The roughness element is defined by using five non-dimensionlized parameters, i.e., relative roughness width (W/w), relative roughness pitch (P/e), relative gap width (g/e), relative roughness height (e/D), and relative gap distance (d/x). The radius of the curvature of the curved rib-element is kept constant and the experimental measurements were done under quasi-steady state. The thermohydraulic performance parameter improved by 3.61 times the smooth flat plate solar air heater (SAH), in curved-ribbed SAH for W/w = 3, P/e = 8, g/e = 1, e/D = 0.045, and d/x = 0.65 at Reynolds number of 23,000. The generalized relation for heat transfer and flow characteristics is also being developed and the predicted Nusselt number and friction factor with the accuracy of ± 7.5% and ± 6.7%, respectively.

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