抄録
The limiting (or lowest) Sherwood number for dilute sphere-packed beds is determined from the mass transfer data taken at zero flow rate by the diffusion current method utilizing potassium ferro- and ferri-cyanides system. These mass transfer data are enhanced by the influence of natural convection. The experimental Sherwood numbers at zero flow rate are plotted against (particle size)3/4, and the limiting Sherwood number Shpo is determined from linear extrapolation of the plot to zero particle size. Shpo thus obtained agrees fairly well with the theoretical value of 2.0 (εf/1.5), where εf is the void fraction of the beds.
