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Heat Transfer Research
Импакт фактор: 1.199 5-летний Импакт фактор: 1.155 SJR: 0.267 SNIP: 0.503 CiteScore™: 1.4

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.2018021728
pages 965-977

EXPERIMENTAL INVESTIGATION OF MIXED CONVECTION AND SURFACE RADIATION HEAT TRANSFER FROM PROTRUDING DISCRETE HEAT SOURCES MOUNTED ON A VERTICAL CHANNEL

Tapano Kumar Hotta
School of Mechanical Engineering, VIT University, Vellore 632014, India
Perni Sri Harsha
Department of Mechanical Engineering, IIT Madras, Chennai 600036, India
S. P. Venkateshan
Department of Mechanical Engineering, IIT Madras, Chennai 600036, India

Краткое описание

Three-dimensional steady-state mixed convection heat transfer experiments are conducted on five protruding discrete heat sources (aluminum) of different sizes arranged at various positions on a substrate board (bakelite), mounted on a vertical channel. The objective is to study the mixed convection and surface radiation heat transfer characteristics of these heat sources. It is seen that the temperature excess of the heat sources is largely influenced by their size, positioning on the substrate board, power generation rate, and channel aspect ratio. The aspect ratio studies are carried out to investigate the effect of the channel size on the cooling of discrete heat sources. It is seen that increasing the channel aspect ratio has a negligible effect on the heat transfer characteristic of heat sources, and a suitable aspect ratio has to be maintained to obtain the optimal temperature of heat sources. Experiments are carried out for both polished and black painted heat sources to study the contribution of surface radiation. The results suggest that radiation is significant as the heat transfer is enhanced by 10% from polished to black painted surfaces. Again, the larger heat source will have less heat dissipation rate per unit area and must be placed on the substrate bottom.


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