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SYMMETRIC SINK FLOW AND HEAT TRANSFER BETWEEN TWO PARALLEL DISKS

机译：两个平行磁盘之间的对称槽流和传热

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The k-s model are performed to investigate numerically the steady, turbulent, incompressible flow and heat transfer converging radially between two stationary disks, which is as a continuously developing flow problem under the internal boundary layer approximations. The effect of relaminarization was considered. This present study has presented a good agreement with the laminar investigation of Murphy et al [1], where no heat transfer was considered. At large values of the dirnensionless radii (" 1) the velocity profile becomes parabolic and invariant and the friction factor approaches the classic value obtained for fully developed flow between infinite plates, 24/Re{sub}0, where Re{sub}0 is an overall Reynolds number based on the volumetric flow rate and the disk spacing and is independent of radius. At radii less than one a typical external boundary layer evolves close to the wall with an approximately uniform core region, the boundary layer thickness decreases from one-half the disk spacing to values proportional to the local radii as the flow accelerates and the friction factor approaches the constant 2.17/Re{sub}0. A local Nusselt number, Nu= 230(r/R){sup}0.650(1- r/R){sup}(-0.386), where r is radial coordinate and R the radius of the disk, was estimated. A large overall Reynolds number was imposed and a relaminarization of the flow was observed. It was suggested that these results can be applicable for laminar and turbulent flow under Re{sub}0=10{sup}6.
机译：进行K-S模型以在数和径向间的稳定，湍流的不可压缩的流动和传热和传热之间进行调查，在两个固定磁盘之间径向会聚，这在内部边界层近似下是连续开发的流量问题。考虑了relaminarization的作用。本研究提出了与Murphy等人[1]的层流调查吻合，其中没有考虑过热传递。在潜伏线的大值（“1）中，速度曲线变得抛物线和不变，并且摩擦因子接近在无限板之间完全发育的流动的经典值，24 / Re {sub} 0，其中Re {sub} 0是基于体积流速和磁盘间距的整体雷诺数，并且与半径无关。在小于一个小于一个典型的外边界层，靠近壁的近似覆盖核心区域，边界层厚度从一个 - 作为流量加速和摩擦因子的磁盘间隔到与本地半径成比例的值以及摩擦因子接近常数2.17 / re {sub} 0.本地诺斯号，nu = 230（r / r）{sup} 0.650（1- R / R）{SUP}（ - 0.386），其中R是径向坐标和盘的半径。施加大的整体雷诺数，观察到流动的relamarization。有人建议这些结果适用于层流和湍流f在RE {sub} 0 = 10 {sup} 6下。

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