PIV에 의한 밸브가 있는 배관내 아이스슬러리의 유동현상 및 압력강하 특성에 관한 실험적 연구

Abstract

Recently, the government introduced the thermal storage system for the reduction of the electric power load. Ice storage system have become popular because they can relieve a significant portion of the peak demand of electricity during the daytime of summer.

Specially, attention is being given to dynamic type ice making technology because it overcomes a decreasing of the melting performance and an increasing of the thermal resistance on the ice layer in static type ice making technology. Thus the dynamic type ice making system has more excellent characteristics than static type as follows : ice making and melting, follow of load and transport of thermal etc. But there are several problems to be solved for direct transportation such as fluid characteristics of two-phase(solid and liquid) flow, decreasing of fraction in pipeline and development of surfactant.

The fundamental research on the flowing characteristics for aspects of ice slurry particles is necessary. Some researchers, such as that on horizontal pipes, vertical pipes and various pipes, have been carried out, but closer examination is urgent.

This study experimented to understand the effect of transporting ice slurry through in pipe with valve. And at this experiment it used ethylene glycol-water solution and a concentration is 20wt%. The experimental apparatus was constructed of ice slurry generation tank, turbo flow meter, manometers for differential pressure measuring, PIV system for flow pattern measuring, illumination and along a horizontal circular tube with valve as test section. The experiments were carried out under various conditions, with velocity of fluid at the entry ranging from 0.5 to 1.5 m/s and concentration of IPF is 20%, 30%. Also valve open rate is 50%, 75%, 100%.