Numerical analysis of a solar air Heater for improved performance Using cylindrical turbulators with RIBS

Madhwesh, N and Karanth, Vasudeva K (2018) Numerical analysis of a solar air Heater for improved performance Using cylindrical turbulators with RIBS. International Journal Of Mechanical Engineering And Technology, 9 (8). pp. 296-309. ISSN 0976 – 6359

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Abstract

Space heating and drying purpose for domestic, commercial and industrial applications are done these days using solar air heaters. Lot of research has been carried out to improve the performance of solar collectors using different types of turbulator design. In this study a typical cylindrical turbulator design with ribs has been analyzed for improvement in thermal performance of solar air heater. It is observed from the CFD study that there is a significant improvement in thermal performance for air heater configuration with such turbulators when compared to plain duct configuration for a wide range of mass flow rate with Reynolds number varying from 3000 to 20000. The presence of cylindrical turbulators with ribs improves the Nusselt number by about 18% for flow Reynolds number in the neighborhood of 10000 for a longitudinal turbulator pitch ratio of 1. However, at higher flow Reynolds number of 20000, the thermal performance of turbulator configuration is the highest at 12% for a pitch ratio of 0.5; This indicates that there is an optimum mass flow rate for which there is an enhanced performance related to the longitudinal pitch ratio of turbulators

Item Type: Article
Uncontrolled Keywords: Solar air heater, pressure drop, Nusselt number, Turbulator.
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 19 Dec 2018 11:07
Last Modified: 19 Dec 2018 11:07
URI: http://eprints.manipal.edu/id/eprint/152485

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