PREDICTION of FLOW IN MIX‐PROOF VALVE BY USE of CFD ‐ VALIDATION BY LDA

Abstract

ABSTRACTThis study forms the basis to achieve quantitative knowledge on the link between hydrodynamics and good hygienic design of closed processing equipment. Knowledge of flow patterns and parameters in process equipment are required to investigate effects of hydrodynamics on cleaning processes. This study was done on a spherical shaped mix‐proof valve (MPV). Flow were predicted by Computational Fluid Dynamics (CFD) and validated by data obtained from experiments using laser sheet visualization and laser Doppler anemometry. Correction of the measured velocities and probe location was required as refraction of laser beams through the curved surfaces of the valve house changes both intersection angle and intersection location. CFD simulations were performed by use of both the standard wall function and the two‐layer model of Norris and Reynolds for near‐wall description. the importance of resolving the near‐wall region is shown. Fully 3D flow patterns were identified and valuable information was obtained for further investigations concerning prediction of cleanability in the MPV based on knowledge of the hydrodynamics herein.