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한태헌(Tae-Heon Han),양경수(Kyung-Soo Yang),윤동혁(Dong-Hyeog Yoon),이경준(Kyongjun Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Heat transfer on two identical nearby circular cylinders immersed in the uniform cross flow at Re = 100 and Pr = 7.0 was numerically studied. We consider all possible arrangements of the two circular cylinders in terms of the distance between the two cylinders and the inclination angle with respect to the direction of the main flow. It turns out that significant changes in the characteristics of heat transfer are noticed depending on how the two circular cylinders are positioned, resulting in quantitative changes of heat transfer coefficients on both cylinders. Collecting all the numerical results obtained, we propose a contour diagram for averaged Nusselt number for each of the two cylinders. The perfect geometrical symmetry implied in the flow configuration allows one to use those diagrams to estimate heat transfer rates on two identical circular cylinders arbitrarily positioned in physical space with respect to the main flow direction.
한태헌(Tae Heon Han),김선민(Sun Min Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We present a theoretical and experimental study of temperature gradient focusing(TGF) exploiting an inherent Joule heating phenomenon. High electric potential applied to the device induces a temperature gradient within the microchannel due to its variable-width geometry, and the temperature-dependent mobility of analytes causes focusing at a specific location.