A numerical study on the absorption of water vapor into a film of aqueous LiBr falling along a vertical plate
A numerical study on the absorption of water vapor into a film of aqueous LiBr falling along a vertical plate
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DOI：
10.1007/s00231-009-0557-y
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发表时间：
2009-11
影响因子：
2.2
通讯作者：
S. Karami;B. Farhanieh
中科院分区：
文献类型：
--
作者：
S. Karami;B. Farhanieh
吸波器是吸波机的重要部件，其特性对吸波机的整体效率有重要影响。本文报道了在雷诺数为5 <Re< 150的情况下，冷媒蒸汽进入溴化锂水冷立式吸收体溶液的同时传热传质过程模型。质量、动量和能量输运方程采用边界层假设，膜流控制方程采用全隐式有限差分法求解。研究了溴化锂的水性质与温度和浓度的关系以及膜厚度与蒸汽吸收率的关系。该模型可以预测水剖面的温度、浓度和性质，以及吸收热通量和质量通量、传热传质系数、吸收器的努斯莱特数和舍伍德数。对壁面温度条件的线性分布进行了分析，并与前人的研究结果进行了比较，验证了该数值方法的可靠性。
Absorber is an important component in absorption machines and its characteristics have significant effects on the overall efficiency of absorption machines. This article reports a model of simultaneous heat and mass transfer process in absorption of refrigerant vapor into a lithium bromide solution of water––cooled vertical plate absorber in the Reynolds number range of 5 <Re< 150. The boundary layer assumptions were used for the transport of mass, momentum and energy equations and the fully implicit finite difference method was employed to solve the governing equations in the film flow. Dependence of lithium bromide aqueous properties to the temperature and concentration and film thickness to vapor absorption was employed. This model can predict temperature, concentration and properties of aqueous profiles as well as the absorption heat and mass fluxes, heat and mass transfer coefficients, Nusslet and Sherwood number of absorber. An analysis for linear distribution of wall temperature condition carries out to investigation the reliability of the present numerical method through comparing with previous investigation.