Abstract
Chapter 5 treats turbulent forced and mixed convection heat transfer in internal flows. It is well-known that the heat transfer rate can be reasonably well estimated without solving the energy equation using momentum/heat transfer analogies. Expressions for the local Stanton numbers are derived for external flow (vertical pipes) and internal flow (circular pipes) using the analogy. An approximate theoretical analysis of the effect of buoyancy on the heat transfer to drag reducing fluids for upward flow in vertical pipes under turbulent conditions is also considered in this chapter. A criterion is suggested for controlling the reduction in heat transfer due to natural convection to less than 5%.
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