Slayt 1 - Marmara Üniversitesimimoza.marmara.edu.tr/~cem/HT/sunu6.pdf · 2011-06-01 · When the...
Transcript of Slayt 1 - Marmara Üniversitesimimoza.marmara.edu.tr/~cem/HT/sunu6.pdf · 2011-06-01 · When the...
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In Chapter 6 we considered the general and theoretical
aspects of forced convection, with emphasis on differential
formulation and analytical solutions.
In this chapter we consider the practical aspects of forced
convection to or from flat or curved surfaces subjected to
external flow, characterized by the freely growing boundary
layers surrounded by a free flow region that involves no
velocity and temperature gradients
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In order to account for the variation of theproperties with temperature, the fluid propertiesare usually evaluated at the so-called filmtemperature, defined as
which is the arithmetic average of the surfaceand the free-stream temperatures. The fluidproperties are then assumed to remain constantat those values during the entire flow
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When relations for local friction and convectioncoefficients are available, the average friction andconvection coefficients for the entire surface can bedetermined by
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The first relation gives the average friction coefficient for the entireplate when the flow is laminar over the entire plate. The second relationgives the average friction coefficient for the entire plate only when theflow is turbulent over the entire plate, or when the laminar flow regionof the plate is too small relative to the turbulent flow region
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In some cases, a flat plate is sufficiently long or theflow to become turbulent, but not long enough todisregard the laminar flow region. In such cases, theaverage friction coefficient over the entire plate is
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