Experimental Study of Heat and Mass Transfer from Humid Air to a Horizontal Tube in False Tube Banks

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This paper describes local characteristics of heat and mass transfer when humid air is cooled and dehumidified in a tube bank. The tests are carried out for a single tube in a uniform flow and for false tube banks of staggered and in-line arrangements in which the test tube is placed at the first, second or third row and the other dummy tubes preserve flow pattern. Dimensionless coefficients of convective mass transfer Sh. convective heat transfer Nus and overall heat transfer Nu are expressed as functions of Reynolds number Re. Distributions of temperatures and heat transfer rates around the tube are also measured. From the first row up to the third row Sh asymptotically approaches a value analogically predicted from Nu corresponding to single-phase heat transfer. Nus is approximately equal to Nu at the first and the second rows and attains a larger value than Nu at the third row. The data on Sh and Nus at the third row agree well with the average characteristics of the tube banks reported previously by the authors.
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