臭化リチウム水溶液膜への水蒸気の吸収に関する数値計算法の考察

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  • Numerical Method for the Absorption of Steam into Films of Aqueous Solution of LiBr.
  • シュウカ リチウム スイヨウ エキマク エ ノ スイジョウキ ノ キュウシュウ

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説明

There are some analytical methods for the steam absorption process, but they do not achieve overall mass balance perfectly. In this paper, the model proposed in the previous paper is modified to include the velocities normal to the film and the change of film thickness. The basic equations are rewritten in the body-fitted coordinate system and solved by the control volume method. The numerical results for a stagnant film show good agreement with the analytical results. Falling film cases for the range of 20-1000 in Re used in absorption refrigeration are calculated by the proposed method. For Re=20, the flow rate and the film thickness increase by 10% and 3% respectively after flowing down 1m. For Re=1000, the increase of flow rate and film thickness are small but the velocities normal to the film are not negligible relative to the effect of diffusion.

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