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The exact expressions of concentration and local or average Sherwood number,Sh or Sh for non-Newtonian fluids which obey the famous power law:τ={K|1/2(1/2)~(1/2)|~(n=1)}in which the flow index n takes any positive rational value,have been obtained by solving the differen-tial equation of diffusion together with the velocity distribution in the falling film flow.The use of Fourth-order Runge-Kutta method and Wegstien's iteration method by means of thecomputer yields results which are a series of values of dimensionless concentration O,local and averageSherwood number for n equal to 1/4,1/3,1/2,1/1.4,1/1.2,1,1.25,2.5,and ∞.When the flow indexn=1,i.e.for Newtonian fluids,the result agrees well with the data from the literature. 相似文献
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本文介绍了用渐开线齿廓的参数方程导出了渐开线齿廓与等强度梁(抛物线)切点位置的统一准确方程,并用牛顿法求解以得到此切点的坐标及齿形系数。还将上述方程绘成算图,用此算图可求得各种情况时内齿轮的齿形系数。文末推导出了一个近似公式。 相似文献
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