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research-article

Optimum Fin parameters of Radial Heat sinks Subjected to Natural Convection

[+] Author and Article Information
Saurav Manna

Mechanical Engineering Department IIT Dhanbad, Jharkhand 826004 India sauravmanna37@gmail.com

Subrata Ghosh

Mechanical Engineering Department IIT Dhanbad, Jharkhand 826004 India subrata@iitism.ac.in

Subhas Chandra Haldar

Department of Mechanical Engineering Haldia, 721657 India schaldar@rediffmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received November 22, 2018; final manuscript received February 27, 2019; published online xx xx, xxxx. Assoc. Editor: Nesrin Ozalp.

ASME doi:10.1115/1.4043091 History: Received November 22, 2018; Accepted February 27, 2019

Abstract

Free convection from an upward facing radial heat sink with fins at equal angular gap attached to an isothermal base has been investigated numerically. The governing equations in primitive variables were changed to vorticity vector potential formulation and an in-house code was developed using finite difference technique. To close the computational domain, two pseudo boundaries were considered. Length, height and number of fins strongly influence the rate of heat transfer while the fin thickness has marginal role. As fin length increases, rate of heat transfer first increases and then remains almost unaffected. However, active length of the fins depends on the strength of buoyancy. Heat transfer continuously increases with fin height but with diminishing effect. Adding more number of fins has two opposing effects. It provides more surface area for convection but at the same time the induced air is unable to reach the interior of the heat sink making the inner portion of the fins inoperative. As a result of these two opposing influences, heat transfer increases in the beginning and then decreases as more fins are added. The paper suggests various fin parameters to achieve maximum cooling. In addition, one can estimate the rate of cooling to be achieved by any radial heat sink.

Copyright © 2019 by ASME
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