アンモニア蒸気吸収過程における物質拡散 : NH_3-H_2Oの二成分系とLiBrを溶解させた三成分系との比較

概要

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This paper is concerned with the mass diffusion in the processes of NH_3 vapor absorption into the pure water and the aqueous solution of LiBr with 60% by mass. A holographic interferometer was employed to observe the sequence of the absorption phenomena and also to measure the unsteady concentration distributions in this absorption process. The results are compared with the theoretical ones, and it is determined that the mass diffusivities are 3-4.5×10^<-9>(m^2/s) for a binary system in the NH_3 concentration range of 35-70% by mass and 0.7-1.5×10^<-9>(m^2/s) for a ternary one in the NH_3 concentration range of 55-80% by mass. As seen in these results, since the mass diffusivity of the ternary system decreases considerably compared with the binary one, it is clear that the enhancement of mass transport is highly essential to increase the performance of the ternary absorption heat pump system.
社団法人日本機械学会の論文
1988-02-25