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research-article

Natural Convection Heat Transfer From Perforated Hollow Cylinder with Inline and Staggered Holes

[+] Author and Article Information
Swastik Acharya

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India, 721 302
swastik.acharya8@gmail.com

Sukanta K. Dash

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India, 721 302
sdash@mech.iitkgp.ernet.in

1Corresponding author.

ASME doi:10.1115/1.4037875 History: Received February 21, 2017; Revised July 24, 2017

Abstract

The continuity, momentum and the energy conservation equation for air around a hollow cylinder with inline or staggered holes have been solved in three dimension to assess the buoyancy driven flow and temperature field around the cylinder. From the thermal field the average surface Nu could be computed for hollow cylinders with inline or staggered holes and the heat loss from the cylinder could be compared with that of a hollow cylinder without holes. Interesting flow and thermal plume around the hollow cylinder with holes could be seen which could help to explain why there is more heat loss from a cylinder with staggered holes compared to a cylinder with inline holes at lower Ra of 10^5, whereas for higher Ra of 10^6 or more there exists an optimum d/D where the heat loss from the perforated cylinder has a maximum value and thereafter it reduces. There are interesting comparisons on Nu for the hollow cylinder with inline or staggered holes and new correlations for Nu versus many different pertinent input parameters have been developed for many cases which can be used practically in industry for designing perforated cylinder with heat loss.

Copyright (c) 2017 by ASME
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