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

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

doi:10.1016/j.ijheatmasstransfer.2008.06.010

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

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

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

72 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	328-336
Number of pages	9
Journal	International Journal of Heat and Mass Transfer
Volume	52
Issue number	1-2
DOIs	https://doi.org/10.1016/j.ijheatmasstransfer.2008.06.010
Publication status	Published - 2009 Jan 15

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1016/j.ijheatmasstransfer.2008.06.010

Cite this

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title = "Loss characteristics and flow rectification property of diffuser valves for micropump applications",

abstract = "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.",

author = "Wang, {Yi Chun} and Hsu, {Jui Cheng} and Kuo, {Ping Chi} and Lee, {Yung Chun}",

note = "Funding Information: The authors are grateful to the financial support from the National Science Council, Taiwan under Contract No. NSC 93-2212-E-006-060. ",

year = "2009",

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doi = "10.1016/j.ijheatmasstransfer.2008.06.010",

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AU - Wang, Yi Chun

AU - Hsu, Jui Cheng

AU - Kuo, Ping Chi

AU - Lee, Yung Chun

N1 - Funding Information: The authors are grateful to the financial support from the National Science Council, Taiwan under Contract No. NSC 93-2212-E-006-060.

PY - 2009/1/15

Y1 - 2009/1/15

N2 - 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.

AB - 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.

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

Abstract

All Science Journal Classification (ASJC) codes

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