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# Numerical Investigations on Fluid Flow and Heat Transfer Characteristics of an Ultra-Thin Heat Pipe with Separated Wick Structures

Yasushi Koito1,*, Akira Fukushima2

1 Division of Industrial Fundamentals, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto, 860-8555, Japan
2 Department of Mechanical and Mathematical Engineering, Graduate School of Science and Technology, Kumamoto University, Kumamoto, 860-8555, Japan

* Corresponding Author: Yasushi Koito. Email: -u.ac.jp

Frontiers in Heat and Mass Transfer 2024, 22(3), 869-887. https://doi.org/10.32604/fhmt.2024.050910

## Abstract

Thermal and fluid-flow characteristics were numerically analyzed for ultra-thin heat pipes. Many studies have been conducted for ultra-thin heat pipes with a centered wick structure, but this study focused on separated wick structures to increase the evaporation/condensation surface areas within the heat pipe and to reduce the concentration of heat flux within the wick structure. A mathematical heat-pipe model was made in the three-dimensional coordinate system, and the model consisted of three regions: a vapor channel, liquid-wick, and container wall regions. The conservation equations for mass, momentum, and energy were solved numerically with boundary conditions by using a code developed by one of the authors. The numerical results with the separated wick structures were compared with those with the centered, which confirmed the effectiveness of the separation of the wick structure. However, the effectiveness of the separation was affected by the position of the separated wick structure. A simple equation was presented to determine the optimum position of the separated wick structures. Numerical analyses were also conducted when the width of the heat pipe was increased with the cooled section, which clarified that the increase in the cooled-section width with the addition of wick structures was more effective than the increase in the cooled-section length. A 44% reduction in the total temperature difference of the heat pipe was obtained under the present numerical conditions. Furthermore, a comparison was made between experimental results and numerical results.

## Keywords

APA Style
Koito, Y., Fukushima, A. (2024). Numerical investigations on fluid flow and heat transfer characteristics of an ultra-thin heat pipe with separated wick structures. Frontiers in Heat and Mass Transfer, 22(3), 869-887. https://doi.org/10.32604/fhmt.2024.050910
Vancouver Style
Koito Y, Fukushima A. Numerical investigations on fluid flow and heat transfer characteristics of an ultra-thin heat pipe with separated wick structures. Front Heat Mass Transf. 2024;22(3):869-887 https://doi.org/10.32604/fhmt.2024.050910
IEEE Style
Y. Koito and A. Fukushima, "Numerical Investigations on Fluid Flow and Heat Transfer Characteristics of an Ultra-Thin Heat Pipe with Separated Wick Structures," Front. Heat Mass Transf., vol. 22, no. 3, pp. 869-887. 2024. https://doi.org/10.32604/fhmt.2024.050910

This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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