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首页> 外文期刊>Journal of Hydroinformatics >Combined bulk and wall reactions in turbulent pipe flow: decay coefficients and concentration profiles
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Combined bulk and wall reactions in turbulent pipe flow: decay coefficients and concentration profiles

机译：湍流管道中的整体反应和壁反应：衰减系数和浓度曲线

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This study discusses the effect of combined first-order, bulk and wall reactions on the overallnintensity of mass withdrawal in smooth pipes. A one-dimensional model for the transport of highnSchmidt number compounds (where the Schmidt number is the ratio of the fluid viscosity to thensolute diffusivity) is extended with the effect of a first-order bulk reaction. Profiles of velocity andneddy diffusivity are obtained with a standard high Reynolds number k–E closure in combinationnwith a modified Van Driest wall function. By comparing the results of the 1D model to annanalytical asymptotic high Sc approximation, it is shown that the interaction between bulk andnwall reactions is very weak. In terms of the decay coefficient, a maximum deviation of 4% isnobserved for very high bulk demand due to the attenuation of the streamwise solute mass flux.nThe parameter range for which the concentration profiles can be safely assumed to be uniform,nboth in the viscous sublayer and in the bulk, is established.
机译：这项研究讨论了组合的一级反应，本体反应和壁反应对光滑管内物质排出总体强度的影响。在一级本体反应的作用下，扩展了用于传输高n Schmidt数化合物的一维模型（其中Schmidt数是流体粘度与溶质扩散系数之比）。通过标准的高雷诺数k–E封闭以及改进的Van Driest壁函数，可以获得速度和涡流扩散率曲线。通过将一维模型的结果与解析的渐近高Sc近似进行比较，表明本体反应和壁反应之间的相互作用非常弱。就衰减系数而言，由于沿流的溶质通量的衰减，对于非常高的体积需求，最大偏差为4％。n可以安全地假设浓度分布的参数范围是均匀的，n在粘性中子层中，并建立了整体。

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