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A Study on the Flow Characteristics of Micro-Elbows

[+] Author Affiliations
T.-A. Kim, Youn J. Kim

Sungkyunkwan University, Suwon, Korea

Paper No. ICMM2005-75188, pp. 441-446; 6 pages
doi:10.1115/ICMM2005-75188
From:
  • ASME 3rd International Conference on Microchannels and Minichannels
  • ASME 3rd International Conference on Microchannels and Minichannels, Parts A and B
  • Toronto, Ontario, Canada, June 13–15, 2005
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4185-5 | eISBN: 0-7918-3758-0
  • Copyright © 2005 by ASME

abstract

In this study, we modeled two micro-elbows with dimensions with 20×1×5810 μm3 and 90° turn at the channel centre. In case of the right angle elbow, the channel turns sharply at a right angle, and in case of the round elbow, the channel turns smoothly 60 μm radius of curvature. In order to investigate flow characteristics, numerical analyses are carried out with pressure driven condition and argon gas. Mass flow rate and pressure distribution of micro-elbows are calculated. Due to the low Reynolds number and Knudsen number Kn = 0.06, we used laminar and compressible Navier-Stokes equation and slip boundary conditions. Although the turn angle of micro-elbows is the same, 90°, mass flow rate is not the same. Mass flow rate of the right angle elbow is lower than that of the round elbow. Besides, in case of the same flow rate, the pressure drop of right angle elbow is larger than that of round elbow. As the mass flow rate decreases, the pressure drop of micro-elbows is increased. Results also show that in a right angle channel, small separation is came into existence in the sharp corner bend of inner wall.

Copyright © 2005 by ASME
Topics: Flow (Dynamics)

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