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Research Papers: Evaporation, Boiling, and Condensation

A Mesoscale Electrohydrodynamic-Driven Two-Phase Flow Heat Transport Device in Circular Geometry and In-Tube Boiling Heat Transfer Coefficient Under Low Mass Flux

[+] Author and Article Information
Viral K. Patel

Multi-Scale Heat Transfer Laboratory,
Department of Mechanical Engineering,
Worcester Polytechnic Institute,
Worcester, MA 01609
e-mail: vkpatel@wpi.edu

Jamal Seyed-Yagoobi

Multi-Scale Heat Transfer Laboratory,
Department of Mechanical Engineering,
Worcester Polytechnic Institute,
Worcester, MA 01609
e-mail: jyagoobi@wpi.edu

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 25, 2014; final manuscript received December 26, 2014; published online February 3, 2015. Assoc. Editor: Bruce L. Drolen.

J. Heat Transfer 137(4), 041504 (Apr 01, 2015) (9 pages) Paper No: HT-14-1153; doi: 10.1115/1.4029545 History: Received March 25, 2014; Revised December 26, 2014; Online February 03, 2015

Meso and microscale two-phase flow heat transport involves devices that are used to remove heat from small surface areas by circulating a working fluid through the heated space and causing phase change from liquid to vapor. There is an impetus to develop such devices for applications that require compact thermal management systems. The active, mesoscale two-phase flow heat transport device presented in this paper is driven solely by electrohydrodynamic (EHD) conduction pumping, and its heat transport characteristics are provided. An important understanding of the EHD conduction pump performance under a two-phase system versus single-phase system is also elucidated from these results. In addition, the ability to generate reliable low mass fluxes by this method has also allowed for determining local in-tube flow boiling heat transfer coefficient as a function of vapor quality in a mesoscale circular tube evaporator, providing limited but valuable information currently unavailable in the literature.

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References

Figures

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Fig. 1

Assembled EHD pump with 20 pairs of electrodes (top) and individual electrodes and spacers (bottom)

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Fig. 2

Single-pair electrode and spacer arrangement

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Fig. 3

Experimental setup

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Fig. 4

Net EHD pump pressure generation versus applied EHD voltage for single-phase liquid flow

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Fig. 5

Mass flux versus applied EHD voltage for single-phase liquid flow

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Fig. 6

Evaporator temperature and heater power variation during heat transport and dryout recovery experiments of EHD-driven two-phase flow device

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Fig. 7

Net EHD pump pressure generation and evaporator pressure drop during heat transport and dryout recovery experiments of EHD-driven two-phase flow device

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Fig. 8

Flow boiling heat transfer coefficient of HCFC-123 versus quality for circular copper tube (D = 1.5 mm), with comparison to two correlations

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