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首页> 外文期刊>International Journal of Heat and Mass Transfer >A model for a non-uniform spray evaporator taking into account the effect of non-isothermal polydisperse droplets
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A model for a non-uniform spray evaporator taking into account the effect of non-isothermal polydisperse droplets

机译：考虑非等温多分散液滴影响的非均匀喷雾蒸发器模型

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摘要

A mathematical model of the water spray heat and mass transfer equipment with co-current flow of air and water droplets has been developed to investigate the effect of polydispersity of droplet size and the effect of spatial non-uniformity of the spray on evaporation performance. Our simulation results revealed that the simplifying assumption of constant droplet temperature led to significant errors when the droplet size distribution was strongly polydisperse. Numerous simulations showed that the average droplet diameter, droplet size distribution and the radial distribution of water spray significantly affected the changes in properties of air and water droplets. For polydisperse droplets with non-uniform spray, the case of a narrower droplet size distribution (σ = 0.2) showed a faster decrease in the averaged diameter and temperature of the droplets, which were associated with a faster temperature decrease and humidity increase of the contacting air, than the case of broader droplet size distribution (σ = 0.4) with the same volume-averaged diameter.
机译：建立了带有空气和水滴并流的喷水传热传质设备的数学模型，以研究液滴尺寸的多分散性和喷雾空间不均匀性对蒸发性能的影响。我们的模拟结果表明，当液滴尺寸分布呈强多分散性时，恒定液滴温度的简化假设会导致明显的误差。大量的模拟表明，平均液滴直径，液滴尺寸分布和水喷雾的径向分布会显着影响空气和水滴的性质变化。对于喷雾不均匀的多分散液滴，液滴尺寸分布较窄（σ= 0.2）的情况下，液滴的平均直径和温度下降更快，这与接触时温度下降和湿度增加更快相关与相同体积平均直径的液滴尺寸分布（σ= 0.4）较宽的情况相比。

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