THE INFLUENCE OF 90° AND 180° PIPE BENDS ON HEAT TRANSFER FROM AN INTERNALLY FLOWING GAS STREAM

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Abstract
An investigation has been made into the effect of 90° and 180° bends, of 50.8 mm internal diameter and varying diameter ratio, on the rate of heat transfer from a fluid flowing through the bend. The test section, immersed in water which acted as a heat sink, consisted of a pipe bend with upstream and downstream lengths of straight pipe. Hot air was blown through the test section and Reynolds numbers in the range 10,000 to 50,000 were studied. Local heat transfer coefficients were computed from a knowledge of local heat flux values along the pipe system. This enabled equations and design charts which predict heat transfer coefficients for a system containing a bend to be produced.

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