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溴化锂水溶液中加入表面活性剂后,水蒸气吸收过程的传热与传质系数显著提高。20世纪50年代,国内外就开始对此强化过程进行研究,但目前尚未有被普遍认可的机制理论。研究人员普遍认同马拉格尼对流(marangoni convection)的强化作用,但是缺乏对其合理的解释。以往的研究大都基于静态池实验,这与实际吸收式热泵内吸收器的动态吸收过程(如液膜的形成等)相距甚远。另外,研究人员大都主要研究溴化锂水溶液与水蒸气的气液界面的强化作用,而忽视了溴化锂水溶液与铜管壁面的固液表面的强化过程。本文从微观的角度对2个强化界面进行分析,解释“马拉格尼对流”强化作用产生的原因,结论与诸多研究人员的实验结果一致。
Lithium bromide aqueous solution after adding surfactant, water vapor absorption heat transfer and mass transfer coefficient significantly increased. In the 1950s, domestic and foreign researchers began to study this process of reinforcement, but at present no mechanism theory has been universally accepted. Researchers generally agree with Marangoni convection (marangoni convection) to strengthen the role, but the lack of a reasonable explanation. Most of the previous researches are based on the static pool experiment, which is far from the dynamic absorption process (such as liquid film formation) of the absorber in the actual absorption heat pump. In addition, most researchers mainly study the strengthening effect of the lithium-bromide aqueous solution and water vapor on the gas-liquid interface, while neglecting the solidification of the solid-liquid surface of the lithium bromide solution and the copper pipe wall. In this paper, we analyze the two intensified interfaces from the microscopic point of view and explain the reasons for the strengthening effect of the “Maraguag convection”. The conclusion is consistent with the experimental results of many researchers.