fluid dynamics, the bulk temperature, or the average fluid bulk temperature, is a convenient reference point for evaluating properties related to convective heat transfer, particularly in applications related to flow in pipes and ducts.
The concept of the bulk temperature is that
adiabaticmixing of the fluid from a given cross section of the duct will result in some equilibrium temperature that accurately reflects the average temperature of the moving fluid, more so than a simple average like the film temperature.
*Kreith, Frank, and Bohn, Mark S. "Principles of Heat Transfer, Sixth Edition." Brooks/Cole: Pacific Grove, CA, 2001.
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