Loss characteristics and flow rectification property of diffuser valves for micropump applications

Yi Chun Wang, Jui Cheng Hsu, Ping Chi Kuo, Yung Chun Lee

研究成果: Article同行評審

70 引文 斯高帕斯(Scopus)

摘要

The primary motivation for this work is to provide data on the loss characteristics and flow rectification performance of flat-walled microdiffuser valves for Reynolds numbers between 100 and 2000 which is considered deficient in literature. The diffusers are designed with a fixed slenderness of 15 and an aspect ratio of 0.92 and with diverging angles ranging from 4° to 120°. The total pressure loss coefficient of the diffuser flow is determined experimentally. Components of the loss are studied in detail by numerical simulations. Results from the computations are in satisfactory agreement with the measurements. Simulations are also carried out for nozzle flows. Based on the experimental and the computational results, efficiencies of the diffuser valves are calculated. It is shown that, for laminar flows, global flow separation plays a significant role in reducing the loss of the diffuser. Consequently, the diffuser angle corresponding to the optimum diffuser efficiency varies from 40° at Re = 100 to 20° for Re ≥500.

原文English
頁(從 - 到)328-336
頁數9
期刊International Journal of Heat and Mass Transfer
52
發行號1-2
DOIs
出版狀態Published - 2009 1月 15

All Science Journal Classification (ASJC) codes

  • 凝聚態物理學
  • 機械工業
  • 流體流動和轉移過程

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