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首页> 外文期刊>International Journal of Heat and Mass Transfer >Bi-dimensional modelling of the thermal boundary layer and mass flux prediction for direct contact membrane distillation
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Bi-dimensional modelling of the thermal boundary layer and mass flux prediction for direct contact membrane distillation

机译：直接接触膜蒸馏的热边界层二维建模和质量通量预测

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A good knowledge on thermal boundary layer thickness and mass flux are important features in the development of membrane distillation pilot modules. The present work poses as a comprehensive approach for modelling both during the process' steady state, whilst cherishing simplicity as it does so through a simple, intuitive software - namely Calc from Libreoffice. The mass transfer model allows prediction of average mass flux, being obtained by tailoring a mass transfer equation to be used together with an overall-macroscopic energy balance for the system. Within such approach, five different convective heat transfer correlations were investigated and a mass transfer coefficient of 6.02 x 10(-7) kg . m(-2). s(-1). Pa-1 was found for the PTFE supported membrane used in the experiments. Thermal boundary layer thickness was estimated using the integral method, primarily under the assumption of constant local heat flux along the membrane extension. Thermal boundary layer thickness was coherently modelled in the middle portion of the channels, region where model results agreed with the assumptions made with 80% accuracy or higher, pointing for correspondingly low variation of heat flux with space within such region. The applicability of the temperature profile proposed in the present work in portraying the reality of permeate and feed in membrane distillation processes was discussed. (C) 2019 Elsevier Ltd. All rights reserved.
机译：对热边界层厚度和质量通量的深入了解是膜蒸馏中试模块开发中的重要特征。当前的工作是在过程的稳定状态下进行建模的一种综合方法，同时通过简单，直观的软件（即Libreoffice的Calc）来珍惜其简单性。传质模型可以预测平均质量通量，该通量可以通过定制传质方程来获得，并与系统的整体宏观能量平衡一起使用。在这种方法中，研究了五种不同的对流传热相关性，传质系数为6.02 x 10（-7）kg。 m（-2）。 s（-1）。实验中使用的PTFE支撑膜为Pa-1。热边界层的厚度是使用积分方法估算的，主要是在沿着膜延伸的恒定局部热通量的假设下。热边界层厚度在通道的中间部分进行了连贯建模，该区域的模型结果与80％或更高准确度的假设相吻合，表明在该区域内热通量随空间的变化相对较小。讨论了本工作中提出的温度曲线在描绘膜蒸馏过程中渗透物和进料的真实性方面的适用性。 （C）2019 Elsevier Ltd.保留所有权利。

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