Transcription of Heat transfer in Flow Through Conduits
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Heat transfer in Flow Through Conduits
Heat transfer in Flow Through Conduits R. Shankar Subramanian Department of Chemical and Biomolecular Engineering Clarkson University A common situation encountered by the chemical engineer is heat transfer to fluid flowing Through a tube. This can occur in heat exchangers, boilers, condensers, evaporators, and a host of other process equipment. Therefore, it is useful to know how to estimate heat transfer coefficients in this situation. We can classify the flow of a fluid in a straight circular tube into either laminar or turbulent flow. It is assumed from here on that we assume fully developed incompressible, Newtonian, steady flow conditions. Fully developed flow implies that the tube is long compared with the entrance length in which the velocity distribution at the inlet adjusts itself to the geometry and no longer changes with distance along the tube.
A variety of correlations are in use for predicting heat transfer rates in laminar flow. From dimensional analysis, the correlations are usually written in the form . Nu =φ(Re,Pr, ) where . hD Nu k = is the Nusselt number, φ is some function, and Pr. p. C k. µ ν α = = is the Prandtl number. Here, h. is the heat transfer coefficient, k
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