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에어젯트 직기에서 가속관 직경변화에 따른 주노즐의 유동특성
정석윤 ( S. Y. Jeong ),김경훈 ( K. H. Kim ) 한국분무공학회 2003 한국액체미립화학회지 Vol.8 No.2
N/A The Air-jet loom represents a major step in the development of shutterless weaving due to its ability to weave a wide range of yarns at high speeds. The Air-jet weaving involvers, inserting a pre-measured length of yarm through the wrap, is sheds by means of compressed air. The analysis of air flow characteristic of the main nozzle and acceleration tube is required for the loom performance. In this paper We examined the effect of the main nozzle with different acceleration tubes as well as diameters. And also, we compared the performance of straight type tube with laval type tube and of according to be suction hole on the acceleration tube, respectively.
자동차 공조시스템에서 건조기 일체형 응축기에 대한 연구
김경훈(K. H. Kim),이우(W. Lee),정석윤(S. Y. Jeong) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An experimental study was performed to understand the heat transfer and fluid dynamic characteristic of Sub-Cooled Hybrid Condenser (SCHC), which conventional condenser and receiver dryer are integrated into. SCHC also employs a sub-cooled refrigerant at the end of the condenser in order to supply perfect liquid refrigerant to the expansion unit. Throughout the present study, it was found that the developed SCHC increases in the degree of sub-cooling by 10~100% compared to conventional condenser. The excessive sud-cooling has improved the cooling performance by 10%, and that leads reduction in evaporator outlet air temperature by 1.5℃. Also found through the study is that the refrigerant pressure drop across SCHC is fairly increased due to insertion of the desiccant cartridge in the receiver tank which composed of zeolite, filter and supporter plate.