Effect of Grid and Straight-throat on Flow Characteristics in Two-Phase Nozzle for Absorption Refrigerating Machine

Abstract

The purpose of this research is to improve the performance of convergent-divergent nozzle for initially subcooled LiBr aqueous solution. The decline in the nozzle efficiency is due to pressure undershoot at nozzle throat and slip between liquid and vapor. We performed experiments using nozzle with grid near the throat and straight-throat. The following results were abtained : (1) Turbulence by grid near the throat has no effect on the slip between liquid and vapor in divergent nozzle flow. (2) The occurrence of cavitation in straight-throat decrease pressure undershoot at throat and slip between liquid and vapor by turbulence and mixing.