Effect of Nozzle Geometry on the Suction Flow Rate in a Ejector

Abstract

Ejector is an equipment devised for making use of the low pressure occurring from the fast fluid injection and it is a transportation equipment which can obtain vacuum using the kinetic energy of the fluid. This ejector system is, nowadays, widely used for construction machinery, heavy equipments, the cooling and ventilation of electronic devices and for the various fluid transportation and pumps.In this study, it is attempted to perform a numerical analysis and an experiment to find out the characteristics of fluid quantity, velocity and the pressure distribution of the induction pipe by changing the length and the radius ratio of the nozzle of ejector .From the results, it is investigated that the distributions of velocity and pressure of induction pipe attached are changing with the length and the radius ratio of the nozzle. In addition, it is shown that for the small and large ejector, the efficiency is the maximum when the length of the nozzle arrived to the neck of the ejector, however, if it is installed at below or above the neck the efficiency is rather decreased . † †

Flow characteristics of injection pump with inclined suction pipe for basic design of cosmetics and paint production facilities

“…Ji's [2] previous studies on injection pump with the design of injection nozzle identi-fied the internal pressure and suction performance with variations of nozzle shape and direction. Kim [3] made comparative analysis on the effect of flow characteristics based on the different nozzle length and diameter ratio and inhalation efficiency using 1].…”