Heat transfer study of enhanced additively manufactured minichannel heat exchangers

Rastan, Hamidreza; Abdi, Amir; Hamawandi, Bejan; Ignatowicz, Monika; Meyer, Josua P.; Palm, Björn

doi:10.1016/j.ijheatmasstransfer.2020.120271

Cited by 44 publications

(11 citation statements)

References 59 publications

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“…14C and D) has been demonstrated to increase heat transfer coefficients by up to 300% (relative to standard channels), by inducing longitudinally spiralling vortices that increase mixing between the wall and core flow regions. 114 The fluid channels heat transfer augmenting design features, previously not feasible with conventional manufacturing techniques, have the potential to enable new levels of performance for fluid channel heat exchanger systems in hypersonic application. 115…”

Section: Future Outlookmentioning

confidence: 99%

Endothermic catalytic cracking of liquid hydrocarbons for thermal management of high-speed flight vehicles

Hubesch

Mazur

Selvakannan

et al. 2022

Sustainable Energy Fuels

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Section: Future Outlookmentioning

confidence: 99%

Endothermic catalytic cracking of liquid hydrocarbons for thermal management of high-speed flight vehicles

Hubesch

Mazur

Selvakannan

et al. 2022

Sustainable Energy Fuels

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“…How should the fluid flow so that the container cools as quickly as possible? This question arises, for instance, in the design of optimal heat exchangers, whose complicated shapes and flows facilitate heat transfer at rates far beyond diffusion [1][2][3][4][5][6][7][8][9][10]. More generally, the problem is related to the ongoing search for sharp bounds on turbulent heat transfer in a variety of settings, including internally heated [11][12][13][14][15][16] as well as buoyancy-driven convection [17][18][19][20][21], among others.…”

Section: Introductionmentioning

confidence: 99%

Optimal cooling of an internally heated disc

Tobasco

2022

Phil. Trans. R. Soc. A.

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Motivated by the search for sharp bounds on turbulent heat transfer as well as the design of optimal heat exchangers, we consider incompressible flows that most efficiently cool an internally heated disc. Heat enters via a distributed source, is passively advected and diffused, and exits through the boundary at a fixed temperature. We seek an advecting flow to optimize this exchange. Previous work on energy-constrained cooling with a constant source has conjectured that global optimizers should resemble convection rolls; we prove one-sided bounds on energy-constrained cooling corresponding to, but not resolving, this conjecture. In the case of an enstrophy constraint, our results are more complete: we construct a family of self-similar, tree-like ‘branching flows’ whose cooling we prove is within a logarithm of globally optimal. These results hold for general space- and time-dependent source–sink distributions that add more heat than they remove. Our main technical tool is a non-local Dirichlet-like variational principle for bounding solutions of the inhomogeneous advection–diffusion equation with a divergence-free velocity. This article is part of the theme issue ‘Mathematical problems in physical fluid dynamics (part 1)’.

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“…Rastan et al [2] investigated the feasibility of additive manufacturing to fabricate mini channel heat exchangers with longitudinal vortex generators. At a Reynolds number of 1380, the convective heat transfer coefficient can be up to three times that of the smooth channel, using distilled water as working fluid.…”

Section: Introductionmentioning

confidence: 99%

Melting of Paraffin Waxes Embedded in a Porous Matrix Made by Additive Manufacturing

2021

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The recent advances in additive manufacturing technology have widened the choice of materials that can be printed, opening new frontiers in the field of heat transfer devices. This paper explores the use of a solid porous matrix in which paraffin waxes, having different melting temperatures (42, 55, and 64 °C), were embedded. The solid matrix is made by additive manufacturing. The parent cell of the porous matrix occupies the volume of a cube with an edge of 5 mm. The entire 3D printed matrix has a square base with an edge of 100 mm, and it has a height of 20 mm. The solid matrix was printed between two plates, each one with a thickness of 10 mm, where thermocouples were inserted, and it was tested in an upright position, laterally heated applying three different heat fluxes (10, 15, and 20 kW m−2). The experimental results are given in terms of the temperature of the heated side, as well as of the phase change material, during the heating process. The temperature reached by the heated side and the time needed to completely melt the paraffin waxes are compared at the different working conditions. Furthermore, the thermal conductivities and diffusivities of the three paraffins and of the parent material of the porous matrix were experimentally evaluated.

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Heat transfer study of enhanced additively manufactured minichannel heat exchangers

Cited by 44 publications

References 59 publications

Endothermic catalytic cracking of liquid hydrocarbons for thermal management of high-speed flight vehicles

Endothermic catalytic cracking of liquid hydrocarbons for thermal management of high-speed flight vehicles

Optimal cooling of an internally heated disc

Melting of Paraffin Waxes Embedded in a Porous Matrix Made by Additive Manufacturing

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