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Jang, Jaesung
Sensors & Aerosols Lab
Research Interests
  • Multi-scale Sensor Systems for Biomedical and Industrial Applications
  • Bio-Aerosol and Aerosol Technology
  • Fundamental Gas and Liquid Flows in Microchannels
  • Electrical Particle & Fluid Manipulation

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Effects of planar inlet plenums on the hydrodynamically developing flows in rectangular microchannels of complementary aspect ratios

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Title
Effects of planar inlet plenums on the hydrodynamically developing flows in rectangular microchannels of complementary aspect ratios
Author
Lee, Sang-YoupJang, JaesungWereley, Steven T.
Keywords
Aspect ratio of rectangular microchannel; Entrance length; Hydrodynamically developing flow; Micro particle image velocimetry; Rectangular microchannel
Issue Date
2008-07
Publisher
SPRINGER HEIDELBERG
Citation
MICROFLUIDICS AND NANOFLUIDICS, v.5, no.1, pp.1 - 12
Abstract
The effects of planar inlet plenum geometry on the developing flow fields in two rectangular microchannels of reciprocal aspect ratios (H/W ∼2.75 and ∼0.40) were investigated for ReD = 1-100 using micro particle image velocimetry (μPIV). These two microchannels were made by a precision sawing and silicon microfabrication techniques. Both the velocity profiles and centerline velocity developments were clearly resolved and extracted along the axial distance from μPIV results. The entrance lengths were found from the centerline velocities using a decaying exponential fitting function where the centerline velocity reaches 99% of the fully developed centerline velocity. The proposed fitting function showed excellent agreement with the experimental results. The planar plenum was shown to cause an upstream predevelopment resulting in the significant reductions in the entrance lengths. Two entrance length correlations were proposed in the forms of Atkinson et al.'s (AIChE J 15:548-553, 1969) and Chen's (J Fluids Eng 95:153-158, 1973) correlations. The proposed entrance length correlations showed that acquired constant portion and slope of the entrance lengths showed 23-27 and 70-81% reductions for H/W = 2.75 while the entrance length correlation for H/W = 0.40 showed 69-73% increase and 41-63% decrease in the constant portion and slope, respectively.
URI
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DOI
10.1007/s10404-007-0179-y
ISSN
1613-4982
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