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Study on Characteristic of Pressure Drop by using Ejector
신유식(Y. S. Shin),이윤환(Y. H. Lee),허두상(D. S. Heo),정효민(H. M. Jeong),정한식(H. S. Chung) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
There are many important factors for breeding fish in an aquafarm. What is especially important for good quality breeding or fish is the maintenance of optimum aquaculture temperature. In summertime, when sea temperatures rise above 25℃ the growth condition is greater and diseases in fish spread. In this study water cooling system using a steam ejector was used to drop the temperature of the water in the aquafarm by about 5℃ from 25℃ or higher. To replace the present water cooling system, we focused on system operated by the latent heat of evaporation. Using a vacuum pressure to evaporate the water in an enclosed tank. The water cooling effects are dependent on the vacuum pressure in the enclosed tank, and the cooling water is generated by evaporation. As the experimental result, the absolute vacuum pressure was obtained with about 8~10㎜Hg with a the vacuum tank capacity of 85Liters. The reaching time needed to reach this vacuum pressure was about 8~10 minutes and had a water cooling temperature difference of 6℃.
하류 유동제어에 의한 에젝터의 효율상승 방법에 관한 연구
김세현(S. H. Kim),이상철(S. C. Lee),신유식(Y. S. Shin),최석천(S. C. Choi),정효민(H. M. Jeong),정한식(H. S. Chung) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The ejector system is used for making a low pressure in industrial field. The ejector is consists of nozzle, mixing section and diffuser. The diffuser is influenced in low pressure of ejector system. The diffuser is an important fluid-mechanical equipment to convert kinetic energy into pressure energy. Many of the experimental and theoretical researches have been done in a diffuser but the understanding of energy transfer and detailed mechanism of energy dissipation is unclear. In this study, computations were performed using a numerical method with SIMPLE algorithm for conical diffuser with various diffuser angles and Reynolds number. Also, we investigated the pressure recovery coefficient in conical diffuser by inserting strut. In this paper, we showed that the strut can cause a rising pressure recovery.