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首页> 外文会议>Canadian Congress of Applied Mechanics(CANCAM 2005); 20050530-0602; Montreal(CA) >Effects of Radial Position and Reynolds Number on Differential Diffusion in a Turbulent Jet
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Effects of Radial Position and Reynolds Number on Differential Diffusion in a Turbulent Jet

机译：径向位置和雷诺数对湍流射流中微分扩散的影响

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摘要

The mixing of scalars in turbulent flows is common in engineering applications. Due to the complexity of turbulence, the majority of studies on this subject have concentrated on a single scalar. However, turbulent flows frequently transport more than one scalar. For example, both temperature and salinity are transported in the oceanic mixed layer. Whenever more than one scalar is being transported by a turbulent flow, there is the possibility that they might evolve separately. Differential diffusion occurs when two scalars in a flow evolve differently due to their unequal molecular diffusivities (D). In many current applications, such as combustion modeling, differential diffusion is assumed to be negligible by assuming that ⅰ) the two species have equal molecular diffusivities, or ⅱ) molecular diffusion is insignificant at high Reynolds numbers. The objectives of this work are to simultaneously study the effects of Reynolds number and radial position on differential diffusion in a turbulent jet.
机译：标量在湍流中的混合在工程应用中很常见。由于湍流的复杂性，有关该主题的大多数研究都集中在单个标量上。但是，湍流经常输送不止一个标量。例如，温度和盐度都在海洋混合层中传输。每当湍流运输一个以上的标量时，它们就有可能分开发展。当两个标量由于其不相等的分子扩散性（D）而以不同的方式演化时，就会发生差异扩散。在许多当前的应用中，例如燃烧模型，通过假设ⅰ）两种物质具有相同的分子扩散率，或ⅱ）在高雷诺数下分子扩散不明显，可以认为微分扩散可以忽略。这项工作的目的是同时研究雷诺数和径向位置对湍流射流中微分扩散的影响。

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