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윤정인,오후규,백목효부 대한기계학회 1995 대한기계학회논문집 Vol.19 No.6
It is known that the heat and mass transfer characteristics in the absorber are most sensitive of the temperature boost of all the heat exchangers and the development of a more efficient absorber should be highly important. This paper describes absorption experiments made with different inside tube diameters, tube length and tube shapes. The purpose of this study is to acquire basic knowledge about heat and mass transfer in a falling film type absorber with vertical inner tubes. Heat and mass transfer were measured for water vapor absorption into a Lithium Bromide-water solution flowing down an absorber of vertical inner tubes. As a result, insert spring tube compares bare tube and heat transfer improved by order of insert spring tube P2(pitch 20 mm) and P1(pitch 10 mm).
이동호,서정윤,백목효부 한국산업안전학회 1991 한국안전학회지 Vol.6 No.3
To better understand the phenomena inside an absorber, where heat and mass transfer coexist, this study selected the most basic absorption model from in which water vapor is absorbed on the surface of a stationary lithium bromide absorbent solution. The purpose of this study is to obtain basic knowledge of heat and mass transfer processes as affected by Marangoni convection induced by addition of surfactant. We apply a non-flowing bulk absorption model and assume that dropwise surfactant is fixed on the absorbent surface. Four governing equation-continuity, laminar monentum, energy and diffusion-are solved numerically to obtain temperature and concentraion distributions during steam absorption with Marangoni convection in conclusion, Sh and Nu genrally increase at the initial absorption stage.
증기흡수시(蒸氣吸收時) 계면활성제액적간(界面活性劑液滴間)에 발생(發生)하는 마랑고니대류거동(對流擧動)의 가시화(可視化)
이동호,최국광,백목효부,서정윤,Rie, D.H.,Choi, K.K.,Kashiwagi, T.,Seo, J.Y. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.2
In most absorption machines, absorption enhancement has been achieved by adding small amount of surfactant additive, which introduced the surface tension difference between absorbent and surfactant droplets in the vapor absorption. The aim of this study is to understand a basic mechanism of Marangoni convection and its effectiveness in the vapor absorption enhancement. In this study, nonflowing aqueous solution of LiBr 60 mass% was exposed to saturated water vapor under the condition that two dropwises surfactant were fixed on the absorbent surface. Our experiments achieved to visualize the enhanced heat and mass transfer phenomena by the effect of Marangoni convection through the laser holographic interferometry. Also, Marangoni convection behavior was obtained by using tracer method.
수직관내(垂直管內)를 흘러내리는 액막식(液膜式) 흡수기(吸收器)의 흡수(吸收) 및 열전달특성(熱傳達特性) (제(第) 1 보(報), 흡수특성(吸收特性))
엄기찬,백목 효부,서정윤,Ohm, K.C.,Kashiwagi, T.,Seo, J.Y. 대한설비공학회 1993 설비공학 논문집 Vol.5 No.1
Mass transfer coefficients were measured for water vapor absorption into a LiBr-Water solution of 60wt% flowing down an absorber of vertical tube type. The absorber is copper tube of 25mm inner diameter and 1000mm length. The film Reynolds number were varied in the range of 35~130. The solution is fed from the top of the pipe, and the conditions of solution are supercooled liquid and superheated liquid. As results, the flowrates of LiBr solution which takes peak value of average absorption mass flux exist. Mass transfer coefficients decrease with increasing the flowrate of LiBr solution, and the decrease rate in the case of supercooled liquid is large as compared with that in the case of superheated liquid. But the absorption rate of supercooled liquid is decidedly superior to that of superheated liquid.