Experimental evaluation of the thermal performance and capillary limit of a screen mesh heat pipe using SDBS and Al2O3-water-based nanofluids

Abstract A comprehensive three-dimensional numerical model is developed to evaluate the effect of bending on water-copper cylindrical heat pipes. This model distinguishes itself from other models by its ability to uniquely determine the operating pressure of the heat pipe based on the operating and physical conditions. The effects of one 90-degree bend and two 90-degree bends are evaluated on the performance of a heat pipe. Two types of wicks are considered: a screen mesh wick and a sintered powder wick. The obtained results show that bending does affect the vapor pressure drop; however, the changes are not significant when compared to the operating pressure of the heat pipe. If the bending is performed in a manner where the wick is not damaged and the liquid is not blocked from returning to the evaporator, the performance of the heat pipe will not be affected significantly. In addition, if the heat pipe is operating in the horizontal direction, where both evaporator and condenser legs are at the same level, bending does not affect the liquid pressure drop significantly; however, the screen mesh does provide a higher capillary limit. The results also showed that the effects of gravity can be important when bending heat pipes and consideration should be given for this factor. When the bent heat pipe works against gravity, the sintered powder wick heat pipes showed higher capillary limits.

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An Experimental Study on the Thermal Performance of a Flat-Ship Heat Pipe with Inner Grooves and Screen Mesh Cover

Transactions of the Korean Society of Mechanical Engineers B ◽

10.3795/ksme-b.2005.29.7.805 ◽

2005 ◽

Vol 29 (7) ◽

pp. 805-813 ◽

Cited By ~ 1

Author(s):

Soo Yong Park ◽

Joon Hong Boo

Keyword(s):

Experimental Study ◽

Heat Pipe ◽

Thermal Performance ◽

Screen Mesh

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Population balance for capillary limit modeling in a screen mesh wick heat pipe working with nanofluids

International Journal of Thermal Sciences ◽

10.1016/j.ijthermalsci.2018.12.015 ◽

2019 ◽

Vol 138 ◽

pp. 134-158 ◽

Cited By ~ 2

Author(s):

Bernardo Herrera ◽

Farid Chejne ◽

Marcia B.H. Mantelli ◽

Juan Mejía ◽

Karen Cacua ◽

...

Keyword(s):

Heat Pipe ◽

Population Balance ◽

Capillary Limit ◽

Screen Mesh

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Experimental Study of the Effects of Ferrofluid on Thermal Performance of a Pulsating Heat Pipe

ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels, Volume 1 ◽

10.1115/icnmm2011-58233 ◽

2011 ◽

Author(s):

Maziar Mohammadi ◽

Mohammad Mohammadi ◽

Amir R. Ghahremani ◽

M. B. Shafii

Keyword(s):

Magnetic Field ◽

Thermal Resistance ◽

Heat Pipe ◽

Thermal Performance ◽

Heat Input ◽

Pure Water ◽

Working Fluid ◽

Pulsating Heat Pipe ◽

Water Based ◽

The Magnetic Field

In this work, a four-turn Pulsating Heat Pipe (PHP) is fabricated and tested experimentally. The novelty of the present PHP is the capability of obtaining various thermal performances at a specific heat input by changing the magnetic field. The effects of working fluid (water and ferrofluid), charging ratio (25%, 40%, and 55%), heat input (25, 35, 45, 55, 65, 75, and 85 W), orientation (vertical and horizontal heat mode), and magnetic field on the thermal performance of PHPs are investigated. The results showed that applying the magnetic field on the water based ferrofluid reduced the thermal resistance of PHP by a factor of 40.5% and 38.3% in comparison with the pure water case for the vertical and horizontal mode, respectively. According to the experimental results, an optimum thermal resistance of 0.38 °C/W was achieved at the following conditions: water-based ferrofluid as the working fluid in the presence of magnetic field, vertical mode, charging ratio of 55%, 7% volumetric concentration, and 85 W heat input. This thermal resistance is 11.5 times better than that of the empty PHP.

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