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전자 스페클 간섭법과 유한요서법을 이용한 면내변형의 측정에 관한 연구
강형수(Hyung-Soo Kang),조기현(Ki-Hyon Cho),김홍석(Hong-suk Kim),정형길(Hyung-Kil Chung) 한국산업융합학회 2002 한국산업융합학회 논문집 Vol.5 No.3
In-plane ESPI(Electronic Speckle Patten1 Interferometry)was devised to measure in~plane defamation and rotation of a specimen with laser in this study. The conventional measuring methods of surface deformations such as the strain gauge have many demerits because they are contact and point-to-point measuring ones. But that ESPI is noncontact, nondestructive and whole field measuring method can overcome previous disadvantages. We used ESPI which is sensitive to in-plane displacement for measuring in-plane deformations of a disk. First of all, the system calibration was done due to an in-plane rotation before getting deformations of a disk. Finally we showed good agreement betweEn theexperiment results and those of the FEA(Finit Element Analysis).<br/>
조기현(Ki-Hyon Cho),정형길(Hyung-Kil Chung),강형수(Hyung-Soo Kang) 한국산업융합학회 2001 한국산업융합학회 논문집 Vol.4 No.1
This study was carried out to investigate the feasibility of the used frying oil as a bin-oil which was one of the alternative fuel for diesel engine. From tests of engine performance, it was shown that the bio-oil and blends and the sufficient potential as alternative fuels of diesel engine except NOx and Smoke emission.<br/> <br/>
밀폐형 2상 열사이폰의 열전달 특성에 관한 실험적 연구
조기현(Ki-Hyun Cho),백이(Yee-Paek),정형길(Hyung-Kil Chung) 한국산업융합학회 2002 한국산업융합학회 논문집 Vol.5 No.3
The thermosyphon has been used as a heat transmission device in the heat recovery of low level energy and cooling for heat generating equipments. Many studies on the working fluids and wicks have been reported to improve the heat transfer efficiency of the thermosyphon. A low temperature heat pipe with acetone is chosen in the present study to compare the heat transfer characteristics due to pouring amount of working fluid, magnitude of power supplied and tilt angles. The thennosyphon made ??15.88×0.8t×600㎜ of copper, evaporation section 200㎜, insulation section 25㎜, condensation 375㎜. Heat transfer rate of the thermosyphon increase as magnitude of power supplied increase and observe dry out phenomenon at 5~10% of pouring amount of working fluid. So thermosyphon at the 150kJ/s judged to need 12% or more. Heat transfer rate of the thermosyphon have nothing to do with tilt angles. Dry out phenomenon of the thermo syphon makes it possible that a low temperature thermosyphon may be used to control temperature and heat transfer of a system when the critical quantity of a working fluid is supplied in the thermosyphon.<br/>