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Comparison of Flow Patterns During Flow Boiling in Single (Dh = 333μm) and Parallel Rectangular Channels (Dh = 207 μm)

[+] Author Affiliations
Prabhu Balasubramanian, Satish G. Kandlikar

Rochester Institute of Technology, Rochester, NY

Paper No. IMECE2003-42089, pp. 315-322; 8 pages
doi:10.1115/IMECE2003-42089
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 4
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

The experimental observation of flow patterns during flow boiling in microchannels has been an interesting field of work intended to enhance our understanding of the heat transfer and two-phase flow mechanisms. A number of studies have been conducted recently to observe the flow patterns during boiling in small channels with hydraulic diameters ranging from 200 μm to 1 mm. The present study is aimed at studying the flow patterns during flow boiling of water in two different channels of hydraulic diameter 207 μm and 333 μm respectively. Highspeed photography is used to obtain video images of the flow field. The channels are machined on top of a copper block and are covered with Lexan to permit visual observation. The copper block along with the channel is heated by a cartridge heater. The effect of channel height on flow patterns in single and multiple channels is studied as a function of mass flux, heat flux and location along the flow length. The results provide important information regarding the boiling behavior in different aspect ratio channels with single and multiple parallel flow channels.

Copyright © 2003 by ASME

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