Active control of flow boiling oscillation amplitude and frequency using a transverse jet in crossflow

We demonstrate a technique to mitigate thermal oscillations in microchannel flow boiling and suppress the characteristic frequency associated with these oscillations. The method employs a transverse jet in crossflow that is fabricated along with the primary microchannel in a double-sided vinyl tape,...

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Bibliographic Details
Published in:Applied physics letters 2016-03, Vol.108 (13)
Main Authors: Vutha, Ashwin Kumar, Rao, Sameer Raghavendra, Houshmand, Farzad, Peles, Yoav
Format: Article
Language:English
Subjects:
Active control
Ambient temperature
Applied physics
Boiling
Cross flow
Laser machining
Microchannels
Momentum
Oscillations
Replenishment
Thermal oscillations
Variation
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Summary:We demonstrate a technique to mitigate thermal oscillations in microchannel flow boiling and suppress the characteristic frequency associated with these oscillations. The method employs a transverse jet in crossflow that is fabricated along with the primary microchannel in a double-sided vinyl tape, using laser machining. Liquid at ambient temperature is injected into a flow boiling region at different momentum flux ratios to control the local temperature. A maximum reduction of 82% in temperature fluctuations was demonstrated and the dominant frequency of oscillations was completely suppressed within a particular range of momentum flux ratios. The observed phenomena are attributed to the replenishment of liquid into dryout regions, thereby preventing the large temperature rise and subsequent drop caused by dryout and rewetting, respectively.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4945334