MASS-TRANSFER IN HORIZONTAL FLOW CHANNELS WITH THERMAL-GRADIENTS

Mass transfer to a wall of a horizontal rectangular channel reactor wa s investigated by the limiting current technique for Reynolds numbers ranging from 200 to 32000. Overall mass transfer coefficients at vario us mass transfer surface angles were obtained while the reactor was op erated under isothermal and non-isothermal conditions. Dimensionless c orrelations were developed for isothermal flows from 25 to 55 degrees C and for non-isothermal flows with applied temperature differences up to 30 degrees C. In the laminar flow range natural convection dominat ed, but under turbulent conditions combined natural and forced convect ion prevailed. Mass transfer was approximately doubled under optimum s election of channel surface rotation, temperature gradient and flow ra te.