Abstract
An experimental investigation was performed to study the flow behavior and the mechanism for the augmentation of mass transfer rates in a rectangular duct having a cylindertype turbulence promoter on the transfer surface. In the study of flow behavior, the positions of corner eddies, separation and reattaching points were measured by visualization. It was found that these positions were correlated with linear functions of the diameter of the turbulence promoter and were independent of the Reynolds number. In the study of the augmentation of the mass transfer rates, mass transfer coefficients and shear stresses were measured by the electrochemical method and were compared with the results without promoter, as Sh/Sh0 and τ/τ0. They were graphically correlated with the diameter of the promoter and Reynolds number.
