Microchannel two-phase flow oscillation control with an adjustable inlet orifice

Brent A. Odom, Mark J. Miner, Carlos A. Ortiz, Jonathan A. Sherbeck, Ravi S. Prasher, Patrick Phelan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

This work describes the experimental setup, method, and results of utilizing a micrometer to move an adjustable orifice immediately in front of an array of microchannels. Research by others indicates potential for significant improvement in delaying critical heat flux and increasing heat transfer coefficients when placing an orifice in front of each individual channel of a microchannel array. The experimental setup in this work allows incremental orifice size changes. This ability allows the experimentalist to find which orifice size provides enough pressure drop immediately in front of the channels to reduce oscillations. The design also allows for rapid change of orifice size without having to remove and replace any components of the test setup. Signal analysis methods were used to identify frequency and amplitude of pressure and temperature oscillations. Low mass flux experiments (300kg m-2 s -1 and 600kg m-2 s-1 of R134a in a pumped loop) showed reduced channel wall temperatures with smaller orifice sizes. The orifice concept was found to be more effective at reducing oscillations for the higher 600kg m-2 s-1 flow rate.

Original languageEnglish (US)
Title of host publicationASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
Pages793-801
Number of pages9
StatePublished - Dec 1 2011
EventASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 - Denver, CO, United States
Duration: Nov 11 2011Nov 17 2011

Publication series

NameASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
Volume11

Other

OtherASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
CountryUnited States
CityDenver, CO
Period11/11/1111/17/11

ASJC Scopus subject areas

  • Mechanical Engineering

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  • Cite this

    Odom, B. A., Miner, M. J., Ortiz, C. A., Sherbeck, J. A., Prasher, R. S., & Phelan, P. (2011). Microchannel two-phase flow oscillation control with an adjustable inlet orifice. In ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 (pp. 793-801). (ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011; Vol. 11).