NDLI: Microchannel Two-Phase Flow Oscillation Control With an Adjustable Inlet Orifice

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Brent, A. Odom Mark, J. Miner Carlos, A. Ortiz Jonathan, A. Sherbeck Ravi, S. Prasher Patrick, E. Phelan
Copyright Year	2011
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 (300 kg m−2 s−1 and 600 kg 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 600 kg m−2 s−1 flow rate.
Starting Page	793
Ending Page	801
Page Count	9
File Format	PDF
ISBN	9780791854976
DOI	10.1115/IMECE2011-62078
Volume Number	Volume 11: Nano and Micro Materials, Devices and Systems; Microsystems Integration
Conference Proceedings	ASME 2011 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2011-11-11
Publisher Place	Denver, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Design Wall temperature Temperature Two-phase flow Pressure drop Oscillations Signals Critical heat flux Flow (dynamics) Heat transfer coefficients Pressure Microchannels
Content Type	Text
Resource Type	Article

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