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首页> 外文期刊>Canadian Journal of Pure and Applied Sciences >MODELING OF THINLIQUID FALLINGFILM IN H2O-LiBr AND H2O-LiCl ABSORPTION REFRIGERATION SYSTEMS
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MODELING OF THINLIQUID FALLINGFILM IN H2O-LiBr AND H2O-LiCl ABSORPTION REFRIGERATION SYSTEMS

机译：H2O-LiBr和H2O-LiCl吸收式制冷系统中的稀液薄膜建模

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Experimental modeling has over the past three decades been used in analyzing simultaneous heat and mass transfer in thin-liquid falling-film absorption processes. However, numerical modeling applications in this area have been minimal due to complications arising from the presence of waves. An approach in numerical modeling is to consider waves as a second order effect, thereby making it a smooth falling-film. The objective of this paper was to develop a numerical model for the absorption process on a thin-liquid smooth falling-film using lithium bromide (LiBr) and lithium chloride (LiCl) solutions. The absorption process of a thin-liquid smooth falling-film was considered as a two-dimensional steady laminar flow within the film thickness to the absorber wall. The conservation equations were used to determine temperature and concentration distribution within the film-thickness using the finite difference technique. Existing data on LiBr and LiCl solutions in the literature were used to validate the developed model. Standard values of absorber wall length, film thickness, solution mass flow-rate, absorbent inlet concentration, inlet temperature, absorber wall temperature, conventional film Reynolds number and absorption design effectiveness were used for both LiBr and LiCl solutions. Data were analyzed using descriptive statistics and student's t-test (p<0.05). The physical properties distribution for both LiBr and LiClsolutions were not significantly different from published results available in the literature(p<0.05). The nodal temperature distribution obtained within the film thickness both in the bulk and interface between the liquid and vapour regions were between 44.4 and 35.0 o C while concentration was between 60.0 and 54.5% for LiBr-H 2 O. Similarly for LiCl-H 2 O, the model temperature distribution was between 35.0 and 30.0 o C while the concentration was between 45.0 and 35.8%.A numerical model on a thin-liquid smooth falling film using LiBr and LiCl solutions was developed. Lithium bromide was also observed to have higher concentration values than lithium chloride thus suggesting a better working fluid combination especially in the absorption air-conditioning system.
机译：在过去的三十年中，实验模型已用于分析薄液降膜吸收过程中的同时传热和传质。然而，由于波浪的存在而引起的复杂性，该领域中的数值建模应用已很少。数值建模中的一种方法是将波视为二阶效应，从而使其成为平滑的降膜。本文的目的是建立使用溴化锂（LiBr）和氯化锂（LiCl）溶液在薄液光滑降膜上的吸收过程的数值模型。薄液体平滑降膜的吸收过程被认为是在到达吸收器壁的膜厚度内的二维稳定层流。使用有限差分技术，利用守恒方程确定薄膜厚度内的温度和浓度分布。文献中有关LiBr和LiCl溶液的现有数据用于验证开发的模型。 LiBr和LiCl溶液均使用吸收塔壁长，膜厚，溶液质量流速，吸收塔入口浓度，入口温度，吸收塔壁温度，常规膜雷诺数和吸收设计效果的标准值。使用描述性统计数据和学生t检验分析数据（p <0.05）。 LiBr和LiCl溶液的物理性质分布与文献中公布的结果没有显着差异（p <0.05）。对于LiBr-H 2 O，在液体区域和蒸汽区域之间的体积以及界面之间的膜厚度内，节点温度分布在44.4和35.0 o C之间，而浓度在60.0和54.5％之间。类似地，对于LiCl-H 2 O ，模型温度分布在35.0至30.0 o C之间，浓度在45.0至35.8％之间。建立了使用LiBr和LiCl溶液的薄液平滑降膜的数值模型。还观察到溴化锂具有比氯化锂更高的浓度值，因此表明更好的工作流体组合，尤其是在吸收式空调系统中。

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