Transient heat transfer characteristics of a thermal microdevice
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Authors
Basu, Saptarshi
Issue Date
2013-08
Type
Electronic thesis
Thesis
Thesis
Language
ENG
Keywords
Mechanical engineering
Alternative Title
Abstract
For the flow boiling experiments, the heater temperature response was correlated to the bubble dynamics for different operating parameters. Conditions at which onset of boiling occurred were identified and the repeatability of the boiling process was studied in detail. Onset of boiling and the subsequent bubble dynamics were recorded with the help of a high-speed video camera. Boiling was initiated at very high wall superheats due to the smoothness of the heater surface and low surface tension of HFE-7000. Discrete bubbles resulted in a temperature drop whereas a vigorous boiling regime resulted in localized dryout and subsequent temperature rise. For short pulses, very high heat fluxes were applied and the heating rate was high. At these heat fluxes, onset of boiling resulted in the formation of a vapor film on the surface and rapid heater temperature rise was observed. Time taken to initiate boiling decreased rapidly with increasing heat flux and then reached a constant value. The wall superheat at which boiling started increased with increasing heat flux and subsequently reached a constant limit.
Description
August 2013
School of Engineering
School of Engineering
Full Citation
Publisher
Rensselaer Polytechnic Institute, Troy, NY