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首页> 外文期刊>International Journal of Heat and Mass Transfer >Influence of particle curvature on transition regime heat conduction from aerosolized nanoparticles
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Influence of particle curvature on transition regime heat conduction from aerosolized nanoparticles

机译：颗粒曲率对气溶胶纳米颗粒过渡态热传导的影响

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摘要

In many applications it is necessary to calculate heat transfer between aerosolized nanoparticles and the surrounding gas, for example when inferring particle sizes from time-resolved laser-induced incandescence (TiRe-LII) data. Under transition regime conditions the heat transfer rate from the aerosolized nanoparticles is often approximated using Fuchs's boundary-sphere method, in which the problem domain is subdivided into a collisionless shell surrounding the nanoparticle that represents the Knudsen layer, surrounded by a continuum gas. Traditionally the collisionless shell thickness is set equal to the mean free path at the boundary sphere temperature, but recently several LII practitioners have adopted a more complex treatment that accounts for particle curvature and the directional distribution of incident gas molecules. This paper assesses this approach using Direct Simulation Monte Carlo (DSMC); while this approach accurately represents the true Knudsen layer thickness, it does not improve the accuracy of heat conduction rates under conditions typical of LII experiments.
机译：在许多应用中，有必要计算雾化的纳米颗粒与周围气体之间的热传递，例如，当从时间分辨的激光诱导白炽度（TiRe-LII）数据推断出粒径时。在过渡状态下，通常使用Fuchs的边界球方法估算雾化纳米颗粒的传热速率，该方法将问题域细分为围绕纳米颗粒的无碰撞外壳，该外壳代表Knudsen层，并被连续气体包围。传统上，将无碰撞壳的厚度设置为等于边界球温度下的平均自由程，但是最近，许多LII从业人员采用了更为复杂的处理方法，该方法考虑了粒子曲率和入射气体分子的方向分布。本文使用直接模拟蒙特卡洛（DSMC）评估了这种方法。虽然这种方法可以准确地表示真实的Knudsen层厚度，但是在LII实验的典型条件下并不能提高导热率的精度。

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