Abstract
The results of calculations of mean and fluctuating heat transfer characteristics in a turbulent flow of liquid through a circular tube with permeable walls are presented. The results were obtained with the use of six differential equations for the description of turbulent momentum and the heat transfer mechanism. The calculations were conducted for air ( Pr = 0.7) over the range of Reynolds numbers Re 0 = 10 4-4 × 10 5 and suction (injection) rates m 0 = −0.2-0.02. The effect of suction and injection on the velocity and temperature distributions, temperature fluctuations, turbulent heat flux, and turbulent Prandtl number is shown. It has been established that the effects of strong suction (injection) on the hydrodynamic and thermal characteristics are different—the fact being due to the appearance of high positive (for suction) and negative (for injection) pressure gradients. In the case of strong suction, a substantial change in Pr t over the tube cross-section is observed. The results of Stanton number calculations for the region far from the inlet cross-section are well correlated to give a relative heat transfer law.
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