Study on Supersonic Nozzle Flow with Micro Bubbles

Abstract

The study deals with a method to reduce the energy loss due to the velocity slip by using micro bubbles in a supersonic two-phase flow nozzle converting enthalpy of a fluid to its kinetic energy. In the experiment, two micro bubble generation methods were attempted. One is the micro bubble generator using a vortex breakdown, and the other is the pressurized dissolution method with a carbon dioxide gas. The two-phase flow with the micro bubbles became the supersonic flow and was very stable compared with the flow with millimeter-size bubbles.