NDLI: Flow Boiling Characteristics in a Fractal-Like Branching Microchannel Network

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Liburdy, J. A. Pence, D. V. Narayanan, V.
Copyright Year	2008
Abstract	This study evaluates flow instability and void fraction in a fractal-like branching microchannel network. The flow network is characterized by set branching ratios for channel length and width of 1/2 and 2, respectively, and features five branching levels. The hydraulic diameter of the channels ranged from 308μm at the inlet to 143μm at the outlet. Test were performed using water heated to an 88°C at the inlet with a mass flow rate of 10g/min. Heat fluxes of 1.76 W/cm2 and 2.64 W/cm2 were applied to the test device for the given flow rate. An upstream control valve was used to throttled the flow with a pressure drop approximately 100 times larger than the pressure drop across the test device. For the cases with and without throttling results for inlet pressure oscillation frequency and vapor activity at the inlet of the test device are compared. In addition, time averaged void fraction is compared for each branching level with and without throttling and is compared to predictions from a 1-D model. Results show good agreement between model and experiments for the average void fraction although local values differ significantly.
Starting Page	97
Ending Page	106
Page Count	10
File Format	PDF
ISBN	9780791848715
DOI	10.1115/IMECE2008-69239
e-ISBN	9780791838402
Volume Number	Volume 10: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B, and C
Conference Proceedings	ASME 2008 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2008-10-31
Publisher Place	Boston, Massachusetts, USA
Access Restriction	Subscribed
Subject Keyword	Water Vapors Oscillations Valves Fractals Boiling Flow (dynamics) Pressure Microchannels Heat Pressure drop Flux (metallurgy) Porosity Flow instability
Content Type	Text
Resource Type	Article

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