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Complex Fluid Flow in Microchannels and Heat Pipes with Enhanced Surfaces for Advanced Heat Conversion and Recovery Systems

Author

Listed:
  • Ana Sofia Moita

    (CINAMIL-Centro de Investigação Desenvolvimento e Inovação da Academia Militar, Academia Militar, Instituto Universitário Militar, Rua Gomes Freire, 1169-203 Lisboa, Portugal
    IN+-Center for Innovation, Technology and Policy Research, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

  • Pedro Pontes

    (IN+-Center for Innovation, Technology and Policy Research, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

  • Lourenço Martins

    (IN+-Center for Innovation, Technology and Policy Research, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

  • Miguel Coelho

    (CMEMS, Campus Azurem, University of Minho, 4800-058 Guimaraes, Portugal)

  • Oscar Carvalho

    (CMEMS, Campus Azurem, University of Minho, 4800-058 Guimaraes, Portugal)

  • F. P. Brito

    (TEMA, DEM, Campus Universitário de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal
    MEtRICs, Campus Azurem, University of Minho, 4800-058 Guimaraes, Portugal)

  • António Luís N. Moreira

    (IN+-Center for Innovation, Technology and Policy Research, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

Abstract

This paper addresses a multiscale approach for heat recovery systems, used in two distinct applications. In both applications, a microscale approach is used (microchannel heat sinks and heat pipes) for macroscale applications (cooling of a photovoltaic—PV cell), and the thermal energy of exhaust gases of an internal combustion engine is used for thermoelectric generators with variable conductance heat pipes. Several experimental techniques are combined such as visualization, thermography with high spatial and temporal resolution, and the characterization of the flow hydrodynamics, such as the friction losses. The analysis performed evidences the relevance of looking at the physics of the observed phenomena to optimize the heat sink geometry. For instance, the results based on the dissipated heat flux and the convective heat transfer coefficients obtained in the tests of the microchannel-based heat sinks for cooling applications in PV cells show an improvement in the dissipated power at the expense of controlled pumping power, for the best performing geometries. Simple geometries based on these results were then used as inputs in a genetic algorithm to produce the optimized geometries. In both applications, the analysis performed evidences the potential of using two-phase flows. However, instabilities at the microscale must be accurately addressed to take advantage of liquid phase change. In this context, the use of enhanced interfaces may significantly contribute to the resolution of the instability issues as they are able to control bubble dynamics. Such an approach is also addressed here.

Suggested Citation

  • Ana Sofia Moita & Pedro Pontes & Lourenço Martins & Miguel Coelho & Oscar Carvalho & F. P. Brito & António Luís N. Moreira, 2022. "Complex Fluid Flow in Microchannels and Heat Pipes with Enhanced Surfaces for Advanced Heat Conversion and Recovery Systems," Energies, MDPI, vol. 15(4), pages 1-20, February.
  • Handle: RePEc:gam:jeners:v:15:y:2022:i:4:p:1478-:d:751479
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    References listed on IDEAS

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    1. Pacheco, N. & Brito, F.P. & Vieira, R. & Martins, J. & Barbosa, H. & Goncalves, L.M., 2020. "Compact automotive thermoelectric generator with embedded heat pipes for thermal control," Energy, Elsevier, vol. 197(C).
    2. F. P. Brito & João Silva Peixoto & Jorge Martins & António P. Gonçalves & Loucas Louca & Nikolaos Vlachos & Theodora Kyratsi, 2021. "Analysis and Design of a Silicide-Tetrahedrite Thermoelectric Generator Concept Suitable for Large-Scale Industrial Waste Heat Recovery," Energies, MDPI, vol. 14(18), pages 1-21, September.
    3. Pourkiaei, Seyed Mohsen & Ahmadi, Mohammad Hossein & Sadeghzadeh, Milad & Moosavi, Soroush & Pourfayaz, Fathollah & Chen, Lingen & Pour Yazdi, Mohammad Arab & Kumar, Ravinder, 2019. "Thermoelectric cooler and thermoelectric generator devices: A review of present and potential applications, modeling and materials," Energy, Elsevier, vol. 186(C).
    4. Bahaidarah, Haitham M.S. & Baloch, Ahmer A.B. & Gandhidasan, Palanichamy, 2016. "Uniform cooling of photovoltaic panels: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 1520-1544.
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    Cited by:

    1. Wenxiao Chu & Maria Vicidomini & Francesco Calise & Neven Duić & Poul Alborg Østergaard & Qiuwang Wang & Maria da Graça Carvalho, 2022. "Recent Advances in Technologies, Methods, and Economic Analysis for Sustainable Development of Energy, Water, and Environment Systems," Energies, MDPI, vol. 15(19), pages 1-24, September.
    2. Carvalho, Rui & Martins, Jorge & Pacheco, Nuno & Puga, Hélder & Costa, Joaquim & Vieira, Rui & Goncalves, L.M. & Brito, Francisco P., 2023. "Experimental validation and numerical assessment of a temperature-controlled thermoelectric generator concept aimed at maximizing performance under highly variable thermal load driving cycles," Energy, Elsevier, vol. 280(C).
    3. Carolina Clasen Sousa & Jorge Martins & Óscar Carvalho & Miguel Coelho & Ana Sofia Moita & Francisco P. Brito, 2022. "Assessment of an Exhaust Thermoelectric Generator Incorporating Thermal Control Applied to a Heavy Duty Vehicle," Energies, MDPI, vol. 15(13), pages 1-19, June.

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