Visualization and Experimental Analysis of Fluid Behavior in Grooved Heat Pipes

High-performance grooved heat pipe modelling requires improved knowledge of flow behavior inside grooves. Even if this flow is usually laminar, a free surface governed by capillarity leads to many difficulties when calculating the mean friction factor of grooves. In the present study, an experimenta...

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Bibliographic Details
Published in:Experimental heat transfer 2008-07, Vol.21 (3), p.188-205
Main Authors: Jacolot, R., Romestant, C., Ayel, V., Bertin, Y., Hugon, J.
Format: Article
Language:English
Subjects:
Applied sciences
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Exact sciences and technology
friction factor
groove
heat pipe
Heat pipes
meniscus
pressure drop
visualization
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Summary:High-performance grooved heat pipe modelling requires improved knowledge of flow behavior inside grooves. Even if this flow is usually laminar, a free surface governed by capillarity leads to many difficulties when calculating the mean friction factor of grooves. In the present study, an experimental bench has been developed in order to visualize the liquid-vapor interface channels of four different axially grooved heat pipes. Subsequent experimentation, which is associated with image processing programs, allows for measurement of liquid height and meniscus radius evolution in a groove along the heat pipe axis. As regards laminar flow inside the grooves typically used in heat pipes, the mean friction factor has been measured.
ISSN:0891-6152
1521-0480
DOI:10.1080/08916150802072842