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首页> 外文期刊>Journal of Heat Transfer >Effect Of Channel Geometry Variations On The Performance Of A Constrained Microscale-film Ammonia-water Bubble Absorber
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Effect Of Channel Geometry Variations On The Performance Of A Constrained Microscale-film Ammonia-water Bubble Absorber

机译：通道几何形状变化对受限的微尺度膜氨水气泡吸收器性能的影响

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摘要

An experimental study of the absorption of ammonia vapor in a constrained thin film of ammonia-water solution is presented. A large aspect ratio microchannel with one of its walls formed of a porous material is used to constrain the thickness of the liquid film. Experiments are performed at a pressure of 2.5 bar absolute and 4 bar absolute and at a fixed weak solution inlet temperature. Weak solution flow rates are varied from 10 g/min to 30 g/min (corresponding to the weak solution Reynolds number, Re, from 15 to 45), inlet mass concentrations are varied from 0% to 15%, and gas flow rates are varied between 1 g/min and 3 g/min (corresponding to the vapor Re from 160 to 520). Six geometries, including three smooth-bottom-walled channels of differing depths and three channels with structured bottom walls, are considered. Results indicate that, for identical rates of vapor absorption, the overall heat transfer coefficient of the 400 μm absorber is in most cases significantly larger than that of other absorbers. For the 150 μm and 400 μm absorbers, a trade-off between the high overall heat and mass transfer coefficients is achieved for the highest vapor to solution flow rate ratio.
机译：提出了在受限的氨水溶液薄膜中吸收氨蒸气的实验研究。具有其壁之一由多孔材料形成的大纵横比的微通道用于限制液膜的厚度。在2.5 bar（绝对）和4 bar（绝对）的压力以及固定的稀溶液入口温度下进行实验。弱溶液的流速从10 g / min到30 g / min（对应于弱溶液的雷诺数Re，从15到45），入口质量浓度从0％到15％不等，气体流速为在1 g / min和3 g / min之间变化（对应于蒸气Re从160到520）。考虑了六个几何形状，包括三个深度不同的平滑底壁通道和三个结构化底壁通道。结果表明，对于相同的蒸汽吸收率，在大多数情况下，400μm吸收器的总传热系数明显大于其他吸收器。对于150μm和400μm的吸收器，要获得最高的蒸气与溶液流速比，就要在高的总传热系数和传质系数之间进行权衡。

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