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research-article

Experimental and CFD study on fluid flow and heat transfer in triangular passage solar air heater of different configurations

[+] Author and Article Information
Rajneesh Kumar

National Institute of Technology Mechanical Engineering Department, Hamirpur, India
rajneesh127.nith@gmail.com

Varun Goel

National Institute of Technology Mechanical Engineering Department, Hamirpur, India
varun7go@gmail.com

Anoop Kumar

National Institute of Technology Mechanical Engineering Department, Hamirpur, India
anoop@nith.ac.in

1Corresponding author.

ASME doi:10.1115/1.4036775 History: Received January 09, 2017; Revised April 28, 2017

Abstract

The fluid flow characteristics and heat transfer in triangular duct solar air heater (SAH) has been studied experimentally and numerically for Reynolds number ranges for 4000 to 18000. In the present paper, three different models of triangular duct solar air heater were considered, namely, Model 1 which has simple triangular duct, Model 2 which has rounded corner on one side of triangular flow passage, and Model 3 contains rounded corner on one side of triangular duct with roughness on the absorber plate of SAH. The absorber plate and apex angle value assumed as constant in all three models of SAH i.e., 160 mm and 60°, respectively. The three-dimensional numerical simulations performed by discretizing computational domain using finite volume method (FVM) and they are analyzed with the help of computational fluid dynamics (CFD) code. Experiments are performed to validation of numerical results by comparing the distribution of absorber plate temperature along the length of the SAH. Whereas, a detailed analysis of different models of solar air heater is carried out by solving flow governing equations numerically on ANSYS Fluent 12.1. A close match has been observed between the simulated and experimental results of SAH with the maximum percentage deviation of approximately ±5% in absorber plate temperature. The rounded apex improves velocity distribution near the corner region and helps in improving heat transfer. In three studied models of solar air heater, the best performance is observed in the case of Model-3.

Copyright (c) 2017 by ASME
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