CONVECTIVE MASS-TRANSFER FROM CYLINDERS IN A JET FLOW

A photoevaporative mass-transfer measurement technique has been used t o determine the convective mass-transfer behavior of stationary and ro tating cylinders which were immersed in a two-dimensional jet of air. For a stationary cylinder, the circumferential distributions of the lo cal mass-transfer rate were determined as a function of jet Reynolds n umber (45000-176000) and ranges of other parameters of practical impor tance (relative position of cylinder in jet (LID) and relative size of cylinder and jet nozzle (d/D)). Circumferentially averaged values of the mass-transfer coefficient were estimated by integration and the re sults used to produce correlations for the mean Sherwood number. For a rotating cylinder immersed in the slot jet, circumferentially average d values of Sherwood number were directly determined for a range of co nditions similar to those used in the study of the stationary cylinder but with rotational speed as an additional variable. Predictions of t he mean Sherwood number for cylinders drying in a slot jet have been m ade using a CFD package and are presented in the form of correlations.