Heat and Mass Transfer from a Rotating Disk with a Source Flow

概要

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The convective heat transfer from a rotating disk with additional flow has recently been proved to give an effective cooling mechanism of rotating devices, such as memory storage disks in computers, or impeller disk for cryogenic fluid pumps. This problem in addition to withdrawal flow was theoretically solved by Sparrow & Gregg, Stuart and Mabuchi et al. The present paper reports the experiments on these themes which were made by using a rotating naphthalene disk with source flow. Authors measured heat and mass transfer characteristics of (I) a disk with source flow in an open environment and (II) a shrouded rotating disk with source flow in semi-closed space. Authors came to the conclusions as follows ; S_h∞=0.955R_<〓r>^0.45+2.7×10^-9R_<〓i>^2.45R_<〓r>^0.45 where Rei denotes the source flow Reynolds number and Rer the rotational Reynolds number S_hc=[1+0.047(vi/wc)^0.74(1-2.183^-(d_1/d_0))]S_h∞ where Vi : mean velocity of a source flow, ω : angular velocity of a rotating disk, c : spacing between two disks, and d_1 and d_0 : diameters of a stationary and a rotating disk respectively. The above equation correlates about 95% of all measured data.
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