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首页> 外文期刊>International Journal of Heat and Mass Transfer >Passive enhancement of ammonia-water absorption by the addition of surfactants
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Passive enhancement of ammonia-water absorption by the addition of surfactants

机译：通过添加表面活性剂被动提高氨水吸收

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Surface-active agents or surfactants have the potential to substantially enhance heat and mass transfer in ammonia-water absorption by reducing the surface tension of the working fluid. The enhancement is caused by interfacial turbulence at the vapor-liquid interface that results from surface tension gradients. A surfactant selection criterion is developed based on the plateau value of surface tension, critical concentration, and the critical Marangoni number required to initiate interfacial turbulence. Based on this criterion, surface-active agents, and their ideal concentrations for the enhancement of ammonia-water absorption are recommended. The preferred additives are found to be 500 PPM of 1-octanol or 2-ethyl-1-hexanol. A heat and mass transfer model is developed to predict the performance of a falling-film absorber due to the addition of surfactants at conditions representative of an absorption heat pump. The model indicates that the overall conductance of the absorber is improved by ～30% by the addition of surfactants. The results from this work can guide intensification of various coupled heat and mass transfer processes using surfactants.
机译：表面活性剂或表面活性剂具有通过降低工作流体的表面张力来显着增强氨吸收中的热量和质量传递。增强是由表面张力梯度产生的蒸汽液界面处的界面湍流引起的。表面活性剂选择标准是基于表面张力，临界浓度的平台值，临界浓度和启动界面湍流所需的临界玛龙龙数。基于该标准，表面活性剂及其理想浓度，适用于增强氨吸收的浓度。发现优选的添加剂是500ppm的1-辛醇或2-乙基-1-己醇。开发了热量和传质模型以预测由于在代表吸收热泵的条件下添加表面活性剂而导致的下降膜吸收剂的性能。该模型表明，通过添加表面活性剂，吸收剂的总电导得到了〜30％。该工作的结果可以使用表面活性剂引导各种偶联热量和传质过程的强化。

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