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한외여과에서 막 표면 농도 예측과 Sherwood 수 상관관계식 보정
Estimation of Solute Concentration at Membrane Surface and Sherwood Number Correlation Modification in Ultrafiltration
HWAHAK KONGHAK, December 1991, 29(6), 646-653(8), NONE
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Abstract
평판형 한외여과 cell에서 dextran 500T 용액의 한외여과 실험을 행하여 조작 조건의 변화에 따른 막 표면 농도를 예측하고, 농도분극층 내의 밀도, 점도 및 확산계수 등의 물리적 성질 변화를 고려한 Sherwood 수 상관관계식을 제시하여 이의 타당성을 검토하였는 바, 농도분극 현상이 큰 경우 기존의 상관관계식에서 나타난 오차를 줄일 수 있었으며 이 때의 관계식은 다음과 같이 나타낼 수 있었다._x000D_
NSh = 0.073ㆍNRe0.061ㆍNSc0.33ㆍ[NSc/NScm]-0.25 (삼투압 모델)_x000D_
NSh = 0.045ㆍNRe0.067ㆍNSC0.33ㆍ[NSc/NScm]-0.20 (경계층 저항 모델)
Concentrations at membrane surface were predicted from ultrafiltration experiments of dextran 500T solution in a flat plate. From this results, considering the change of physical properties in boundary layer, modified Sherwood number correlation was introduced. This correlation reduced the errors for opera-tion pressure difference variation. The modified Sherwood number correlation equations are as follows:_x000D_
NSh=0.073ㆍNRe0.061ㆍNSc0.33ㆍ[NSc/NScm]-0.25 (osmotic pressure model)_x000D_
NSh=0.045ㆍNRe0.067ㆍNSc0.33ㆍ[NSc/NScm]-0.20 (boundary layer resistance model)
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Cheryan M, "Ultrafiltration Handbook," Technomic Publishing Company, Inc., Langcaster (1986)
