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Heat Transfer Research
Импакт фактор: 0.404 5-летний Импакт фактор: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 51, 2020 Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2012004656
pages 507-534

MIXED CONVECTION AND ITS INTERACTION WITH SURFACE RADIATION IN A DIFFERENTLY HEATED ENCLOSURE: A CRITICAL APRAISAL

Swarup Kumar Mahapatra
Indian Institute of Technology Bhubaneswar
Sikata Samantaray
Siksha 'O' Anusandhan University
Amitava Sarkar
Department of Mechanical Engineering, Jadavpur University, Kolkata, India-700032

Краткое описание

The present study is based on numerical investigation of mixed convection coupled with surface radiation within a differentially heated square cavity. The effect of surface radiation on the flow regimes, because of the combined effect of shear induced flow and buoyancy, was investigated. We analyzed the flow which is steady, two-dimensional, and laminar within a differentlially heated cavity. The fluid is considered to be incompressible and the source term is evaluated using the Boussinesq approximation. The finite difference method was employed as a numerical scheme to solve the momentum and energy equations. The net radiation method is used to evaluate radiosity from diffuse and gray surfaces. A parametric study was conducted with the following controlling parameters: Rayleigh number (Ra), Richardson number (Ri), emissivity (e), and wall motion. It is found that for opposing mixed convection regimes (i.e., at Ri = 1 or more) in the presence of surface radiation, the heat transfer rate is higher for the horizontal wall movement than that for the vertical wall movement. In the presence of pure opposing mixed convection, the minimum heat transfer rate occurs at the Richardson number Ri =1 for the vertical wall movement, but at the Richardson number Ri = 1.8 for the horizontal wall movement. In contrast to the convective heat transfer, radiative heat transfer is found to be independent of Ri and wall movement.