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Evaluation of momentum and thermal eddy diffusivities for turbulent flow in tubes

机译:管中湍流动量和热涡流扩散率的评估

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摘要

The present investigation deals with a differential formulation to estimate the eddy diffusivity together with the universal velocity for fully developed turbulent flows in a tube. The subsequent theoretical predictions of wall friction coefficients and Nusselt numbers are in reasonable agreement with the classical solution of Blasius wall friction coefficient and Dittus and Boelter correlation for heat transfer, Nu = 0.023 Re~(0.8) Pr~(1/3). The differential form of the eddy diffusivity equation is rendered into an explicit form by regression of the computer runs for wide range of 200
机译:本研究涉及一种微分公式,以估算涡流扩散率以及管中充分发展的湍流的通用速度。随后的壁摩擦系数和Nusselt数的理论预测与Blasius壁摩擦系数和Dittus和Boelter换热相关性的经典解Nu = 0.023 Re〜(0.8)Pr〜(1/3)合理地吻合。通过在200

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