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首页> 外文期刊>International Journal of Heat and Mass Transfer >The effect of pressure on the performance of bubble column dehumidifier
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The effect of pressure on the performance of bubble column dehumidifier

机译：压力对鼓泡塔除湿机性能的影响

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摘要

Many experimental and theoretical studies have been conducted on bubble columns to improve its performance. Most of these studies assumed operating under atmospheric pressure condition and neglected the gas-side resistance. In this work, the effect of the pressure on the dehumidification process in bubble column dehumidifier is investigated experimentally under varying operating conditions. The measurements were conducted at absolute pressures in the range of 1 -2 bars, superficial velocity range of 2-18 cm/s, and column height range of 3-7 cm. A model is developed for the relationship between the bubble column effectiveness and the number of transfer units which combines the influence of the heat and mass transfer processes. In addition, a semi-empirical model is adopted and modified for the gas-side mass transfer coefficient to capture the effect of the pressure. The model correlates Sherwood number with Reynolds number, Schmidt number, and the density ratio of air and water vapor. It is found that the total heat transfer rate and the effectiveness of the bubble column dehumidifier both increase with the superficial velocity. However, the heat transfer rises and the effectiveness decreases with the pressure. The column height is found to insignificantly affect the heat transfer and the effectiveness. The developed models predict the total heat transfer rate and the bubble column effectiveness with a maximum deviation of 2% from the experimental measurements. The results suggest that operating a bubble column dehumidifier under higher pressure will result in a larger size to compensate for the decrease occurs in the effectiveness.
机译：为了提高气泡性能，已经对气泡塔进行了许多实验和理论研究。这些研究大多数假设在大气压条件下运行，而忽略了气体侧阻力。在这项工作中，在不同的操作条件下，通过实验研究了压力对鼓泡塔除湿机中除湿过程的影响。测量是在1 -2 bar的绝对压力，2-18 cm / s的表观速度范围和3-7 cm的柱高范围内进行的。针对气泡塔效率与转移单元数量之间的关系，开发了一个模型，该模型结合了传热和传质过程的影响。另外，采用半经验模型并修正了气体侧传质系数，以捕获压力的影响。该模型将舍伍德数与雷诺数，施密特数以及空气和水蒸气的密度比相关。结果表明，鼓泡塔除湿机的总传热速率和效率均随着表观速度的增加而增加。但是，随着压力的增加，传热增加而效率降低。发现塔的高度对传热和有效性没有显着影响。开发的模型可预测总传热速率和气泡塔效率，与实验测量值的最大偏差为2％。结果表明，在较高压力下运行鼓泡塔除湿机将导致更大的尺寸，以补偿发生的有效性下降。

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