The heat transfer coefficient of convection from the wall to the flow depends on flow type, on surface temperature distribution in a stream-wise direction, and in transient cases also on time. In so-called conjugated problems, the surface temperature distribution of the wall and flow are coupled together. Thus, the simultaneous solution of convection between the flow and wall, and conduction in the wall are required because heat transfer coefficients are not known. For external and internal flows, very accurate approximate analytical expressions have been derived for heat transfer in different kinds of boundary conditions which change in flow direction. Due to the linearity of the energy equation, the superposition principle can be adopted to couple with these expressions the surface temperature and heat flux distributions in conjugated problems. In the paper, this type of approach is adopted and applied to a number of industrial applications ranging from flat plates of electroluminecence displays to the optimization of heat transfer in fins, fin arrays and mobile phones.
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Use of Analytical Expressions of Convection in Conjugated Heat Transfer Problems
R. Karvinen
e-mail: reijo.karvinen@tut.fi
R. Karvinen
Tampere University of Technology
, P.O. Box 589, 33101 Tampere, Finland
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R. Karvinen
Tampere University of Technology
, P.O. Box 589, 33101 Tampere, Finland
e-mail: reijo.karvinen@tut.fi
J. Heat Transfer. Mar 2012, 134(3): 031007 (9 pages)
Published Online: January 11, 2012
Article history
Received:
July 9, 2010
Revised:
August 26, 2011
Accepted:
September 8, 2011
Online:
January 11, 2012
Published:
January 11, 2012
Citation
Karvinen, R. (January 11, 2012). "Use of Analytical Expressions of Convection in Conjugated Heat Transfer Problems." ASME. J. Heat Transfer. March 2012; 134(3): 031007. https://doi.org/10.1115/1.4005129
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