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首页> 外文期刊>International Journal of Heat and Mass Transfer >Absorption characteristics of lithium bromide (LiBr) solution constrained by superhydrophobic nanofibrous structures
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Absorption characteristics of lithium bromide (LiBr) solution constrained by superhydrophobic nanofibrous structures

机译：超疏水纳米纤维结构约束的溴化锂（LiBr）溶液的吸收特性

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摘要

An experimental study on absorption characteristics of water vapor into a thin lithium bromide (LiBr) solution flow is presented. The LiBr solution flow is constrained between a superhydrophobic vapor permeable wall and a solid surface that removes the heat of absorption. As opposed to conventional falling film absorbers, in this configuration, the solution film thickness and velocity can be controlled independently to enhance the absorption rate. The effects of water vapor pressure, cooling surface temperature, solution film thickness, and solution flow velocity on the absorption rate are studied. An absorption rate of approximately 0.006 kg/m~2 s was measured at a LiBr solution channel thickness and flow velocity of 100 μm and 5 mm/s, respectively. The absorption rate increased linearly with the water vapor driving potential at the test conditions of this study. It was demonstrated that decreasing the solution film thickness and increasing the solution velocity enhance the absorption rate. The high absorption rate and the inherently compact form of the proposed absorber facilitate development of compact small-scale waste heat or solar-thermal driven cooling systems.
机译：提出了水蒸气对稀溴化锂（LiBr）溶液流的吸收特性的实验研究。 LiBr溶液的流动被限制在超疏水蒸气可渗透的壁和去除吸收热的固体表面之间。与传统的降膜吸收器相反，在这种配置中，可以独立控制溶液膜的厚度和速度，以提高吸收率。研究了水蒸气压力，冷却表面温度，溶液膜厚度和溶液流速对吸收率的影响。在LiBr溶液通道厚度和流速分别为100μm和5 mm / s的情况下，测得的吸收速率约为0.006 kg / m〜2 s。在这项研究的测试条件下，吸收率随水蒸气驱动电位线性增加。结果表明，减小溶液膜厚度和增加溶液速度可以提高吸收速率。所提出的吸收器的高吸收率和固有的紧凑形式有利于紧凑型小规模废热或太阳热驱动冷却系统的开发。

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