Y. H. Hwang

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In refrigeration and air-conditioning systems, oil migrates from the compressor to the remainder of the system. Thus, the working fluid is not only a refrigerant, but a refrigerant-oil mixture. While some oil leaves the compressor by forming an equilibrium mixture with the refrigerant, some is dragged as a result of very high refrigerant vapor velocity at(More)
Air-conditioning systems run under widely changing operating conditions. During their transient period of operation, they suffer from losses in capacity and COP, which are dependent on the magnitude and rate of the deviation of the real operating conditions from design conditions. To understand the system behavior under such dynamic conditions, a test(More)
Zinc contamination in near- and sub-surface environments is a serious threat to many ecosystems and to public health. Sufficient understanding of Zn speciation and transport mechanisms is therefore critical to evaluating its risk to the environment and to developing remediation strategies. The geochemical and mineralogical characteristics of contaminated(More)
Perfluorinated compounds (PFCs) consist by a hydrophobic perfluorinated carbon tail and a hydrophilic ionic headgroup. Because of their unique structure, PFCs have a wide variety of applications including active ingredient in fire fighting foams, impregnation for food packing and waterproof breathable fabrics and the producing of teflon. Recently, the(More)
The use of particle method in solving the Navier-Stokes equation is attractive from the viewpoint of avoiding the explicit discretization of the nonlinear convection term adopted in the commonly used Eulerian approach. In this paper, we shall report on the progress of our recently developed particle method in solving the Navier-Stokes equation. Starting(More)
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