Understanding transport mechanism of a self-sustained thermally driven oscillating two-phase system in a capillary tube

Understanding transport mechanism of a self-sustained thermally driven oscillating two-phase... Nomenclature</h5> A n coefficients in the Fourier series (–)</P>h lv latent heat (J/kg)</P>k thermal conductivity (W/m K)</P>M ¯ molecular weight (kg/mol)</P>P pressure (Pa)</P>q ″ heat flux (W/m 2 )</P>R ¯ universal gas constant (J/mol K)</P>t time (s)</P>T temperature (°C or K)</P>x coordinate (–)</P>X location of the liquid–vapor interface (m)</P>Greek symbols α thermal diffusivity (m 2 /s)</P>δ length scale (m)</P>ρ density (kg/m 3 )</P>σ ˆ accommodation coefficient (–)</P>Subscripts cond condenser</P>f fluid, film</P>i interfacial</P>l liquid</P>res reservoir</P>sat saturation</P>v vapor</P>w wall</P>1 Introduction</h5> A pulsating heat pipe (PHP) is an apparently simple looking heat transfer device, however with complex internal thermo-hydrodynamic transport processes, responsible for the self-sustained thermally driven oscillating two-phase Taylor bubble flow, which in turn, leads to its unique heat transfer characteristics. Research on PHP has received substantial attention in the recent past, due to its unique operating characteristics and potential applications in many passive heat transport situations [1–4] . A PHP consists of a simple capillary tube, with no wick structure, bent into many turns, and partially filled with a working fluid (for constructional details, refer to [4] ). When the temperature difference between the heat source and the heat sink exceeds a certain threshold, the vapor bubbles and liquid http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Heat and Mass Transfer Elsevier

Understanding transport mechanism of a self-sustained thermally driven oscillating two-phase system in a capillary tube

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Publisher
Elsevier
Copyright
Copyright © 2013 Elsevier Ltd
ISSN
0017-9310
eISSN
1879-2189
D.O.I.
10.1016/j.ijheatmasstransfer.2013.05.067
Publisher site
See Article on Publisher Site

Abstract

Nomenclature</h5> A n coefficients in the Fourier series (–)</P>h lv latent heat (J/kg)</P>k thermal conductivity (W/m K)</P>M ¯ molecular weight (kg/mol)</P>P pressure (Pa)</P>q ″ heat flux (W/m 2 )</P>R ¯ universal gas constant (J/mol K)</P>t time (s)</P>T temperature (°C or K)</P>x coordinate (–)</P>X location of the liquid–vapor interface (m)</P>Greek symbols α thermal diffusivity (m 2 /s)</P>δ length scale (m)</P>ρ density (kg/m 3 )</P>σ ˆ accommodation coefficient (–)</P>Subscripts cond condenser</P>f fluid, film</P>i interfacial</P>l liquid</P>res reservoir</P>sat saturation</P>v vapor</P>w wall</P>1 Introduction</h5> A pulsating heat pipe (PHP) is an apparently simple looking heat transfer device, however with complex internal thermo-hydrodynamic transport processes, responsible for the self-sustained thermally driven oscillating two-phase Taylor bubble flow, which in turn, leads to its unique heat transfer characteristics. Research on PHP has received substantial attention in the recent past, due to its unique operating characteristics and potential applications in many passive heat transport situations [1–4] . A PHP consists of a simple capillary tube, with no wick structure, bent into many turns, and partially filled with a working fluid (for constructional details, refer to [4] ). When the temperature difference between the heat source and the heat sink exceeds a certain threshold, the vapor bubbles and liquid

Journal

International Journal of Heat and Mass TransferElsevier

Published: Oct 1, 2013

References

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