Browsing by Author "Chen, Ing-Youn"

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Influence of Inlet Configurations on the Refrigerant Distribution of a Dual Cold-Plate System
(2010)
Yang, Kai-Shing
;
Yu, Kun-Huang
;
Chen, Ing-Youn
;
Wang, Chi-Chuan
;
電子工程學系及電子研究所
This study examines the refrigerant distribution of a dual cold-plate system subject to the influence of heating load and inlet configurations. Three inlet configurations, namely, uniformly divided, side-entrance, and inlet inclination, are examined. For an unequal heating load for both uniformly divided and side-entrance configurations, it is found that the distribution of mass flow rate subject to the influence of heating load is strongly related to the outlet states of the two cold plates. For the condition where one of the cold plates is in a superheated state while the other is in a saturated state, the mass flow rate pertaining to a fixed heating load is lower than that of a smaller heating load, and the difference increases significantly when the heating load gets smaller. For the condition where both outlet states of cold plate are at superheated states, the mass flow rate for the fixed heating load is about the same for the uniformly divided configuration and is marginally higher than that of the smaller heating load at the side-entrance configuration. The inlet inclination has a moderate influence on the flow distribution; the difference in mass flow rate is as large as 15% when the inclination angle is 10 degrees.
Novel no-moving-part valves for microfluidic devices
(2010-10-01)
Yang, Kai-Shing
;
Chen, Ing-Youn
;
Wang, Chi-Chuan
;
Shyu, Jin-Cherng
;
機械工程學系
This study characterizes and analyzes the performances of micro diffusers/nozzles with five types of enhancement structures and one of conventional micro nozzle/diffuser valve. The pressure drops across the designed micro nozzles/diffusers are found to be increased considerably when the obstacle and fin structure are added. Further, the micro nozzle/diffuser having added circular area reveals the lowest pressure drop, owing to the hydraulic diameter is increased by circular area and lower interface friction. The maximum improvement of the loss coefficient ratio is about 16% for an added 3-fin structure operated at a Reynolds number around 70. Upon this situation, the static rectification efficiency improves 4.43 times than the conventional nozzle/diffuser. Experimental results indicate the performance peaks at a Reynolds number around 70, and an appreciable decline is encountered when the Reynolds number is reduced. It is due to the efficiency ratio of conventional micro nozzle/diffuser significant increases with the Reynolds number.