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首页> 外文期刊>International Journal of Heat and Mass Transfer >Conjugate heat and mass transfer by jet impingement over a moist protrusion
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Conjugate heat and mass transfer by jet impingement over a moist protrusion

机译：通过在潮湿的突出部上进行射流撞击来共轭传热和传质

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摘要

Biosubstrates drying can be intensified, controlled and optimized, even in blunt shapes, by providing exposure to air jet impingement. In this paper round air jet impingement on cylinder protrusions of a model substrate is investigated, for moderate Reynolds numbers and various geometry arrangements. A comprehensive numerical model, featuring conjugate interface transport (local fluid dynamic effects), multiphase coupling (local surface evaporation) and moisture diffusion notations, is first validated with the corresponding experimental results. Then quantitative distributions of temperature and moisture within the protrusion and along its exposed surface are presented, focussing on the dependence of surface heat and mass transfer on geometry arrangement and fluid dynamic regime. Two values of Reynolds number, two jet heights and two protrusion/jet diameter ratio combinations are investigated. It is pointed out that, within the investigated range of variables, a protrusion/jet diameter ratio equal to 1 allows for flow patterns that foster process enhancement, but at the expenses of treatment uniformity: after 15min of treatment the 10% of protrusion only is still relatively moist, but with a strong internal non-uniformity, whereas with a protrusion/jet diameter ratio equal to 3 the untreated part accounts to the 85%, with a smoother internal distribution.
机译：通过暴露于空气喷射的冲击下，即使是钝的形状，也可以加强，控制和优化生物基质的干燥。在本文中，针对中等雷诺数和各种几何布置，研究了圆形空气喷射撞击在模型基板的圆柱突起上的情况。首先以相应的实验结果验证了具有共轭界面传输（局部流体动力效应），多相耦合（局部表面蒸发）和水分扩散符号的综合数值模型。然后，给出了突起内及其沿暴露表面的温度和水分的定量分布，重点是表面热量和传质对几何形状排列和流体动力学状态的依赖性。研究了雷诺数的两个值，两个喷射高度和两个突出/喷射直径比组合。需要指出的是，在所研究的变量范围内，突起/射流直径比等于1允许流动模式促进过程增强，但以处理均匀性为代价：处理15分钟后，仅突起的10％为仍然相对湿润，但内部不均匀性很强，而突出/射流直径比等于3时，未处理部分占85％，内部分布更平滑。

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