On the basis of Naiver - Stokes equations and KKKKKKKKKKK - 33333333333 turbulence model

the transient hydrodynamics behavior of liquid jet loop reactor with periodically oscillating operation which is carried out by switching of central and circumambient jet was studied. The flow developing time Tv

1 (operation when injection shifted from circumambient to central inlet)

Tv

2(operation when injection shifted from central to circumambient inlet) and the whole oscillating period Tv(the sum of fv

1 and Tv

2) were determined. The effects of liquid injection rate

the height of draft tube and the ratio between the diameters of reactor with draft lube on developing time

oscillating period were also investigated.