EXPERIMENTAL AND NUMERICAL INVESTIGATION OF THE BEHAVIOR OF A VAPOR–LIQUID MIXTURE IN A VENTURI TUBE

A fl ashing fl ow occurs after a high-temperature liquid fl ows through a Venturi tube, forming a fl ashing region downstream of the throat and generating an adaptive back pressure which will aff ect a vapor fl ow in front of the throat. To reveal the phenomenon, the eff ect of the condensate fl ow rate on the steam fl ow rate in a Venturi tube is explored experimentally with consideration for the installation angle impact. The two-phase mixture approach is used to numerically explain the fl ashing fl ow behavior. The radial steam volume fraction is not equal in the fl ashing region, and the highest steam fraction appears near the wall. The maximum water discharge for various constructions is predicted numerically. The steam fl ow rate at the output can be maintained low if the condensate fl ow rate is near the expected value. Furthermore, fl ashing is signifi cantly more visible at smaller throat diameters, which results in a continuous increase in the radial steam volume fraction
A fl ashing fl ow occurs after a high-temperature liquid fl ows through a Venturi tube, forming a fl ashing region downstream of the throat and generating an adaptive back pressure which will aff ect a vapor fl ow in front of the throat. To reveal the phenomenon, the eff ect of the condensate fl ow rate on the steam fl ow rate in a Venturi tube is explored experimentally with consideration for the installation angle impact. The two-phase mixture approach is used to numerically explain the fl ashing fl ow behavior. The radial steam volume fraction is not equal in the fl ashing region, and the highest steam fraction appears near the wall. The maximum water discharge for various constructions is predicted numerically. The steam fl ow rate at the output can be maintained low if the condensate fl ow rate is near the expected value. Furthermore, fl ashing is signifi cantly more visible at smaller throat diameters, which results in a continuous increase in the radial steam volume fraction
Author:  Xinqi Han, Weifeng He, Shi-Rui Li
Keywords:  fl ashing fl ow, Venturi tube, multiphase fl ow, steam volume fraction, condensate fl ow rate
Page:  1361