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실리카 슬러리를 사용한 동역학적 압력여과기의 성능 해석
Performance Analysis of Dynamic Pressure Filter with Silica Slurry
HWAHAK KONGHAK, October 1989, 27(5), 637-646(10), NONE
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Abstract
본 연구에서는 최근 개발되어 실용화 단계에 있는 Taylor와류를 이용한 동역학적 압력여과기의 성능을 실험적으로 조사하였다. 위치에너지를 구동력으로 입자의 평균크기가 4㎛인 실리카 1.0wt% 슬러리를 사용하여 실험한 결과 평균 공경이 1.2㎛인 막을 투과한 여액의 선속이 회전속도가 증가함에 따라 증가하였다. Taylor 와류가 층류형태를 보이는 영역에서는 기존 이론에 따라 투과선 속의 역수가 누적 투과량에 비례하는 경향을 보았으나, 난류형태의 Taylor와류영역에서는 초기 과도기를 지나면 여액 투과선속이 Taylor수에 비려하여 거의 일정한 값에 도달하였다. 본 실험결과들을 근거로 투과선속을 예측하기 위한 무차원 상관식들을 제의하였다.
Recently the dynamic pressure filter has been developed and its commercialization started. In this study its performance has been tested experimentally. Experiments with 1.0wt% slurry of 4㎛-silica particles by apply-ing the potential energy for the driving force show that the filtrate flux of water through the membrane of 1.2㎛ pore size is proportional to the rotating speed of inner cylinder. In laminar flow with Taylor vortices the reciprocal of the filtrate flux is found proportional to the cumulative throughput in agreement with a conventional theory. But in tur-bulent flow with Taylor vortices after the transient period the filtrate flux shows to reach a nearly constant value and is found proportional to the Taylor number. On the basis of these results of experiments the dimensionless relations to predict the filtrate flux are suggested in this study.