Validity of the quasi-2D optimal variable density lattice for effective liquid cooling based on Darcy–Forchheimer theory

In this study, we investigate the validity of variable-lattice-density optimization based on the Darcy–Forchheimer theory for an effective liquid-cooling quasi-2D structure including experimental verification. The unit lattice features a simple cylinder shape, and its size distribution is optimized....

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Bibliographic Details
Published in:Thermal science and engineering progress 2024-10, Vol.55, p.102898, Article 102898
Main Authors: Takezawa, Akihiro, Matsui, Kenjiro, Murakoshi, Shomu, Taniguchi, Kentaro, Moritoyo, Ryota, Kitamura, Mitsuru
Format: Article
Language:English
Subjects:
Additive manufacturing
Brinkman–Forchheimer equation
Porous flow
Thermal conduction–convection
Variable-lattice-density optimization
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Summary:In this study, we investigate the validity of variable-lattice-density optimization based on the Darcy–Forchheimer theory for an effective liquid-cooling quasi-2D structure including experimental verification. The unit lattice features a simple cylinder shape, and its size distribution is optimized. Considering its anisotropy, we regard Darcy’s permeability, Forchheimer’s drag coefficient, and the effective thermal conductivity as tensors and calculate these effective properties using the representative-volume-element method. Two types of optimizations are performed, i.e., minimizing the surface temperature and maximizing the flow rate, using the gradient method. We examine the results using three methods: an approximate simulation based on the Brinkman–Forchheimer equation, a detailed simulation based on the Navier–Stokes equation, and an experiment. We focus primarily on the exact measurement of planar temperature distribution using thermocouples. The proposed methodology exhibits high accuracy in regions with a certain flow level, although the error can be significant in low-flow regions. •An optimization method of lattice heat exchanger is experimentally and numerically verified.•The flow model is based on anisotropic Brinkman–Forchheimer theory.•Obtained optimal structures was realized by additive manufacturing.•Exact measurement of the planer temperature distribution was performed.•Good agreement of the temperature in the regions with a certain rate of flow.
ISSN:2451-9049
DOI:10.1016/j.tsep.2024.102898