대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)
- 제22권4호
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- Pages.489-498
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- 1998
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
DOI QR Code
수직관내 리튬브로마이드 수용액막의 흡수과정에 대한 비흡수가스의 영향
Effects of Non-Absorbable Gases on the Absorption Process of Aqueous LiBr Solution Film in a Vertical Tube (I)
- Kim, Byeong-Ju (Dept. of Mechanical IEngineering, Hongik University) ;
- Lee, Chan-U (Dept. of Mechanical IEngineering, Hongik University)
- 발행 : 1998.03.01
초록
Among the heat/mass exchange units composing an absorption system, the absorber, where the refrigerant vapor is absorbed into the liquid solution is the one least understood. In the present study, the effects of non-absorbable gas on the absorption process of aqueous lithium bromide solution falling film inside a vertical tube were experimentally investigated. In the range of film Reynolds number of 30 ~ 195, heat and mass transfer characteristics were investigated as a function of non-absorbable gas volumetric concentration, 0.2 ~ 20%. An increase of non-absorbable gas volumetric concentration degraded the mass transfer rate dramatically in the absorption process. The reduction of mass transfer rate was significant for the addition of small amount of non-absorbable gas to the pure vapor. At film Reynolds number of 130, an increase of non-absorbable gas concentration from 0.2 to 6.0% resulted in the decrease of mass transfer rate by 36% and 20% of non-absorbable gas by 59%. However the decrease of film Nusselt number with the increase of volumetric concentration of non absorbable gas was relatively smaller than the decrease of Sherwood number. Critical film Reynolds number was identified to exist for the maximum heat and mass transfer regardless of the volumetric concentration of non-absorbable gases.
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