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백대성(Dae Sung Back),김정석(Jung Seok Kim),권영철(Young Chul Kwon),이규섭(Gyu Seop Lee) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Magneto-rheological(MR) fluid is changed form a liquid state into a solid state by a magnetic field. When the magnetic field is applied, typical MR fluids have a suspension of micro-sized magnetic particles in a base oil, so they obstruct the flow of the oil. Therefore, the key issue is the dispersion stability, because the density of particles is different from oil. In the present study, the dispersion stability and physical characteristics of MR fluids along chemical compositions are studied.
이수광(Soo-Kwang Lee),이상재(Sang-Jae Lee),이권재(Kwon-Jae Lee),김정석(Jeong-Suk Kim),백대성(Dae-Sung Back) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
In the present study, the performance characteristics of R-410A heat-pump with an indoor air flow rate in cooling and heating modes are experimentally investigated to understand a capacity, a COP, a degree of superheat and subcooling, and an evaporating and condensing pressure. The performance of the heat pump is measured by the calorimeter of an air enthalpy method. With increasing the indoor air flow rate, the capacity, COP, degree of superheat, degree of subcooling and condensing pressure increase, at cooling mode. And capacity and COP increase but degree of superheat, degree of subcooling and condensing pressure decrease, at heating mode. But the significantly change of the evaporating pressure was not observed at cooling / heating modes.
김정석(Jung Seok Kim),이권재(Kwon Jae Lee),이기원(Ki Won Lee),백대성(Dae Sung Back),권영철(Young Chul Kwon) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Viscosity of a magnetorheological(MR) fluid can be influenced by means of inducing a magnetic field. When the magnetic field is applied, particles arrange themselves in a network of chains, so they obstruct the flow of the oil. Owing to this, viscosity of MR fluid increases significantly. To obtain a better insight in the behaviour of MR fluid, it is necessary to visualize the interaction between the particles. The main problem with visualizing this MR fluid is the high density of particles. In the present study, the behavior of MR fluid in the channel applying the magnetic field are visualized.