LOCAL HEAT/MASS TRANSFER DISTRIBUTION AROUND SHARP 180 degree TURN IN A SMOOTH SQUARE CHANNEL.
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The local heat transfer characteristics in a three-pass smooth channel of square cross section were investigated via the naphthalene sublimation technique. The top and bottom of the test duct were of napthalene. Highly localized heat/mass transfer measurements along the bottom wall of the test duct and around the sharp 180 degree turn region were made for three values of Reynolds numbers between 12,500 and 50,000. The following conclusions can be drawn: 1. The spanwise-averaged Sherwood number at any location of the test duct is higher than the fully developed values. The average heat/mass transfer downstream of the 180 degree turn is higher than that upstream of the turn. The maximum average Sherwood number is observed immediately before the end of the 180 degree turn. 2. The measured highly detailed heat/mass transfer distributions around the sharp 180 degree turn indicate that the local Sherwood number is about 2 to 3 times higher than the fully developed value for the corresponding Reynolds number.
author list (cited authors)
Han, J. C., Chandra, P. R., & Lau, S. C.