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A Visualization Study of Heterogeneous Condensation on Nano-Particles in a Fully Saturated Microchannel

[+] Author Affiliations
Sang Young Son

NASA Glenn Research Center

Paper No. IMECE2005-82421, pp. 679-683; 5 pages
doi:10.1115/IMECE2005-82421
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Part B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4222-3 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

The high heat transfer rate and compactness of micro/minichannel mutiphase flow system associated with phase change phenomena have been increasingly attractive in thermal management and microfluidic sensor development for applications which demand requirements such as small, light, and efficient systems. In this paper, quarts square microchannels with a hydraulic diameter of 1000 μm and a length of 20 mm are used for the path of fully saturated forced convection air flow with nano-particles (Θ ~ 100 nm). The outside of microchannel wall is cooled by natural convection of room air. Two distinctive heterogeneous condensation modes are observed as of droplet condensation on the channel wall and nano-particle nucleate condensation in the core air stream. At the exit of microchannel, liquid droplets with an order of micrometer diameter are observed by microscopic visualization using Nd:YAG (532 nm) Laser sheet illumination. The droplet growth visualization data show a influence of gas mixture mass flux, local vapor concentration, and wall surface condition either on wall droplet condensation and nucleate condensation droplet.

Copyright © 2005 by ASME

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