Prediction of the temperature field in flat plate heat pipes with micro-grooves – Experimental validation

• Published in: International journal of heat and mass transfer Vol. 51; no. 15-16; pp. 4083 - 4094
• Main Authors: Lefèvre, Frédéric, Rullière, Romuald, Pandraud, Guillaume, Lallemand, Monique
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 15.07.2008; Elsevier
• Subjects: Applied sciences; Energy; Energy. Thermal use of fuels; Engineering Sciences; Exact sciences and technology; Flat plate heat pipe; Heat transfer; Heat transport capability; Mechanics; Meniscus curvature; Micro-grooves; Physics; Theoretical studies. Data and constants. Metering; Thermal resistance; Thermics; Two-phase heat spreader; Meniscus curvature; Heat transport capability; Thermal resistance; Flat plate heat pipe; Micro-grooves; Two-phase heat spreader; Two phase flow; Heat pipe; Capillary flow; Experimental study; Modeling; Liquid meniscus; Microroughness; Cooling system; Groove; Curvature; Heat transfer; Flat plate
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2007.12.007

A liquid and vapour flow model coupled to a thermal model is presented for a flat plate heat pipe with micro-grooves. This model allows the calculation of the liquid and vapour pressures and velocities, the meniscus curvature radius in the grooves and the temperature field in the heat pipe wall from the heat source to the heat sink. The meniscus curvature radius is introduced in the thermal model to take into account the heat transfer at the liquid–vapour interface. Experimental measurements of the meniscus curvature radius as well as temperature measurements along a grooved heat pipe are compared to the model results. Both comparisons show the good ability of the numerical model to predict the maximum heat transport capability and the temperature field in the heat pipe. The model is used to optimize the heat pipe dimensions in order to improve its thermal performances.