教師資料查詢 | 類別: 期刊論文 | 教師: 洪祖昌 Hong Zuu-chang (瀏覽個人網頁)

標題:Fluid Dynamics and Heat Transfer Analysis of Three Dimensional Microchannel Flows with Microstructures
學年96
學期1
出版(發表)日期2008/01/01
作品名稱Fluid Dynamics and Heat Transfer Analysis of Three Dimensional Microchannel Flows with Microstructures
作品名稱(其他語言)
著者洪祖昌; Hong, Zuu-chang; Zhen, Chaw-en; Yang, Chien-yuh
單位淡江大學機械與機電工程學系
出版者Taylor & Francis
著錄名稱、卷期、頁數Numerical Heat Transfer, Part A: Applications 54(3), pp.293-314
摘要The subsonic gas flows through straight rectangular cross-sectional microchannel with patterned microstructures was simulated using the direct simulation Monte Carlo (DSMC) method. An implicit treatment for low-speed inflow and outflow boundaries for the DSMC of the flows in microelectromechanical systems (MEMS) is employed. The 3-D microchannel flows are simulated with the cross-section aspect ratio ranging between 1 and 5. The comparison between 3-D cases and 2-D case shows that when the aspect ratio < 3, the two extra side-walls in the 3-D case have significant effects on the heat transfer and flow properties. When the aspect ratio increases, the flow pattern and heat transfer characteristics tend to approach those of 2-D results. The 2-D simplification is found to be reasonable when the cross-section aspect ratio is larger than 5. The microchannel flows with microstructures are also calculated with three different Knudsen numbers regime cases, and each case is calculated with three different microstructure temperatures, 273 K, 323 K, and 373 K. One Knudsen numbers regime ranges between 0.72 and 1.8, another regime ranges between 0.24 and 0.6 and the other regime ranges between 0.08 and 0.2. The computations show that the cooling and heating effects of the microstructure temperature on flow properties are enhanced with decreasing Knudsen number, and the higher microstructure temperature accelerates the velocity of the flow at the locations above the microstructures.
關鍵字
語言英文
ISSN1040-7782
期刊性質國內
收錄於
產學合作
通訊作者
審稿制度
國別中華民國
公開徵稿
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