볼텍스 세퍼레이터(Vortex Separator) 내부 입자 유동 특성 해석
Characteristics of Particulate Flow in Vortex Separator
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초록
본 연구에서는 볼텍스 세퍼레이터 내부의 밀폐된 영역 내에서 발생하는 회전에 의한 입자상 물질과 유체의 분리 특성 파악을 위하여 전산유체역학을 이용한 수치해석을 수행하였다. 볼텍스 세퍼레이터는 접선방향 운동량으로 인해 회전유동이 발생하여 원심력과 중력으로 인한 입자상 물질과 유체의 분리가 이루어지므로 비정상 상태의 복잡한 흐름을 갖는다. 본 연구에서는 유한체적법 기반의 3차원 점성 유동장의 비정상 해석을 수행하였으며 이상유동의 해석을 위하여 오일러-오일러 모델을 이용하였다. 효율적인 설계를 위하여 세 가지 형태의 볼텍스 세퍼레이터 내부 구조에 대한 분석을 수행하였으며, 입자상 체적비, 입자 직경의 변화에 따른 분리효율을 비교하였다. 또한 전산해석을 통하여 얻어진 분리성능을 확인하였으며 실험을 통한 검증을 수행하였다.
Abstract
This study computationally modeled the stratification of solid particles in the rotating flow inside a vortex separator intowhich particulate flow is injected. During the rotation initiated by the tangential momentum, the dynamic force stratifies the particulateflow and interacts with gravitational force as well as friction, which make the flow instable and complex. Two phase flow model basedon Euler-Euler formulation was employed to effectively model the flow dynamics of two phase flow inside the vortex separator, whichis numerically solved by using finite difference method for unsteady and viscous flow regime. For the efficient design of the vortexseparator, three types for interior structures were tried and analyzed with various volume fractions and sizes of particulate matters. Thecomputational results were validated with comparisons with experimental measurements for separation efficiencies both for fluid andsolid phases. The results show that the effectiveness of the stratification as well as the validity of computational assessment.
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