摘要
This study numerically explores the mixing caused by a vortex ring launched upward into a two-layer density-stratified fluid in a rectangular tank so as to search for a highly efficient mixing method.The upper and lower fluid layers are an aqueous glycerol solution and an aqueous solution of potassium dihydrogen phosphate(KH2PO4),respectively.The phenomena of vortex rings with Reynolds numbers of 4000,6000,and 8000 were simulated.The vortex-in-cell method is used to calculate the dynamics of the upper and lower fluids,and the CIP method is used to trace the concentration of the lower fluid.The simulations reproduce the mixing process successfully and elucidate the relationship between mixing efficiency and the Reynolds number of the vortex ring.
