LOCAL MASS-HEAT TRANSFER DISTRIBUTION ON SURFACES ROUGHENED WITH SMALL SQUARE RIBS

An electrochemical analogue technique has been used to measure the mass-heat transfer distribution in pipes roughened with square small ribs. The rib pitch to height ratios were varied from 3 to 10, the Reynolds number from 1 × 104 to 2.5 × 105 and the Schmidt number from 1 × 103 to 7 × 103. Measurements were made in regions with different degrees of flow development. Representative mass transfer distributions are given and discussed. It has been found that the mass transfer distributions are less non-uniform at higher Reynolds numbers and that they are virtually independent of the Schmidt number over a wide range of Sc. © 1979.