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research-article

A Study of Enhanced Heat and Mass Transfer from Variable Height Fin Array Undergoing Natural Convection

[+] Author and Article Information
Debayan Dasgupta

ME Department, NIT Silchar Silchar, Assam 788010 India dasguptadebayan@gmail.com

Kankan Kishore Pathak

ME Department, GIMT Azara Guwahati, Assam 781017 India kankankishore@gmail.com

Asis Giri

Itanagar Nirjuli Arunachal Pradesh, 791109 India measisgiri@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 December 29, 2018; final manuscript received July 10, 2019; published online xx xx, xxxx. Assoc. Editor: Nesrin Ozalp.

ASME doi:10.1115/1.4044426 History: Received December 29, 2018; Accepted July 10, 2019

Abstract

A numerical study is performed on simultaneous heat and mass transfer from a shrouded vertical non-isothermal variable height fin array, representing dehumidification process under natural convection. Fluid properties are treated uniform and the fluid is assigned to comply with Boussinesq approximation to include the effect of density variation with temperature and concentration. Semi implicit method for pressure linked equations revised (SIMPLER) algorithm is adopted to resolve pressure and velocity coupling. A detailed parametric investigation of fin spacing, variable fin height and fin tip to shroud clearance for a range of thermal and mass Grashof number is undertaken. Results indicate that in case of smaller fin spacing, involving fin length of 0.3 m, coefficients of sensible and latent heat transfer increase with the decreasing variable height (H1*) of fin and become maximum at H1* = 0.5, for all thermal and mass Grashof numbers considered presently. Further, total heat transfer analysis on a particular base length due to sensible heat shows a maximum of 24.4 % enhancement whereas, same due to the latent heat shows a maximum of 25.8 % enhancement, depending on the values of clearance. Induced velocities also increase with the decreasing variable height of fin (H1*) which influence the heat and mass transport. The output parameters of this analysis, like induced velocities and overall Nusselt numbers due to the sensible and latent heat, are correlated with the governing parameters. The correlation coefficients are found to be in a range from 0.97 to 0.99.

Copyright © 2019 by ASME
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