Heat and Mass Transfer from a Rotating Disk with a Confronting Stationary Disk

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There are many essentially different flow types between the disk rotating in an open environment and the one with a shroud. In the present paper, we aim to research the heat and mass transfer rates from the rotating disk confronting to a stationary disk. Two patterns in variation of Sherwood number are formed with diminution of opening space c. The one of patterns is that Sherwood number decreases with the ratio of c/d_0,and the other changes as Sherwood number decreases to the minimum value at c/d_0=0.022 and turns to increase, where d_0 is the diameter of the rotating disk. In addition, we notice that the similarities between Sherwood and Nusselt numbers realize for each pattern, and that the rates of heat and mass transfer K_cm/α_m is estimated to be 1.35. In regard to j-factor by Colburn we affirm j_H is almost equivalent to J_D.
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