高真空蒸発空間における物質移動の一考察

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タイトル別名
  • A Consideration on Mass Transfer in Evaporating Space of High Vacuum Evaporation
  • コウ シンクウ ジョウハツ ノ ジョウハツ クウカン ニ オケル ブッシツ イ

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Experiments on vacuum evaporation were made in falling-film colum in a range of residual air pressure from 1 × 10-4 to 3.5 × 10-1. Torr by use of di-butyl-sebacate (D.B.S.). In this work, slip-diffusion model which consists of two zones was applied to analysis of mass transfer in the evaporating space. The following results were obtained : The mechanisms of mass transfer in the evaporating space were divided by the value of Pr/Pvs.At the value of Pr/Pvs above 1.4, mass transfer in the evaporating space is controled by moecular diffusion, and then the effect of molecular-burst-evaporation on mass transfer velocity is neglected. At the value of Pr/Pvsbelow 0.3, mass transfer in evaporating space is controled by molecular-burst-evaporation, and then the effect of molecular diffusion on mass transfer velocity is neglected. At a range of Pr/Pvsfrom 0.3 to 1.4, mass transfer in evaporating space is controled by two mechanisms (molecular diffusion and molecular-burst-evaporation).<BR>The relationship of D.B.S. between the value of Pr/Pvs and the mechanisms of mass transfer in the evaporating space described above agrees with those of di-butyl-phthalate and di-2-ethyl hexyl-phthalate. Consequently, it is considered that 0.3 and 1.4 of Pr/Pvs are the universal values.

収録刊行物

  • 真空

    真空 22 (9), 306-310, 1979

    一般社団法人 日本真空学会

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