Abstract
AbstractWe present a complete model of a thermoelectric micro-energy harvester to transform ambient thermal fluctuations into electricity that couples a thermoelectric generator (TEG) to a heat storage unit (HSU) filled by a phase-change material embedded in a metallic foam subjected to convective flows due to the Marangoni effect. Convective heat transfer at the HSU is simulated with the Darcy–Brinkman–Forchheimer bulk equations, a shear stress boundary depending on the porosity, and the phase change with the enthalpy-porosity method. The porous matrix weakens the Marangoni effect by decreasing the surface shear stress while increasing the effective thermal conductivity. Introducing the metallic foam multiplies the efficiency in the transformation between thermal spatial gradients and electric energy with respect to only Marangoni driving. For a heat storage unit of 8 cm $$\times$$
×
1 cm, Darcy number Da $$=10^{-2}$$
=
10
-
2
coupled to a TEG with Seebeck coefficient 0.027, we find that the harvested energy multiplies with respect to a base PCM driving by Marangoni: 3.2 times (23.6 J) for porosity $$\epsilon =0.95$$
ϵ
=
0.95
, 3.9 times (28.4 J) for $$\epsilon =0.9$$
ϵ
=
0.9
, 4.3 times (31 J) for $$\epsilon =0.85$$
ϵ
=
0.85
. Decreasing the permeability augments the resistance to the convective flows and slightly reduces the electric energy generated.
Funder
Ministerio de Ciencia e Innovación
Universidad Politécnica de Madrid
Publisher
Springer Science and Business Media LLC
Subject
Physical and Theoretical Chemistry,General Physics and Astronomy,General Materials Science
Cited by
1 articles.
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1. IMA10: interfacial fluid dynamics and processes;The European Physical Journal Special Topics;2023-04