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Thermofluid Characterization of Nanofluid Spray Cooling Combining Phase Doppler Interferometry with High-Speed Visualization and Time-Resolved IR Thermography

Author

Listed:
  • Miguel Figueiredo

    (IN+, Mechanical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal)

  • Guido Marseglia

    (Research Department, Università degli Studi Link Campus University of Rome, Via del Casale di San Pio V, 44 0016 Rome, Italy
    Escuela Técnica Superior de Arquitectura de Sevilla, Av. de la Reina Mercedes, 2, 41012 Seville, Spain
    Instituto de Matemáticas de la Universidad de Sevilla, (IMUS), Universidad de Sevilla, Avenida Reina Mercedes, 41012 Seville, Spain)

  • Ana S. Moita

    (IN+, Mechanical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
    CINAMIL, Department of Exact Sciences and Engineering of the Portuguese Military Academy, Rua Gomes Freire, 203, 1169-203 Lisbon, Portugal)

  • Miguel R. O. Panão

    (ADAI, LAETA, Mechanical Engineering Department, University of Coimbra, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal)

  • Ana P. C. Ribeiro

    (Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal)

  • Carlo M. Medaglia

    (Research Department, Università degli Studi Link Campus University of Rome, Via del Casale di San Pio V, 44 0016 Rome, Italy)

  • António L. N. Moreira

    (IN+, Mechanical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal)

Abstract

Spray impingement on smooth and heated surfaces is a highly complex thermofluid phenomenon present in several engineering applications. The combination of phase Doppler interferometry, high-speed visualization, and time-resolved infrared thermography allows characterizing the heat transfer and fluid dynamics involved. Particular emphasis is given to the use of nanofluids in sprays due to their potential to enhance the heat transfer mechanisms. The results for low nanoparticle concentrations (up to 1 wt.%) show that the surfactant added to water, required to stabilize the nanofluids and minimize particle clustering, affects the spray’s main characteristics. Namely, the surfactant decreases the liquid surface tension leading to a larger wetted area and wettability, promoting heat transfer between the surface and the liquid film. However, since lower surface tension also tends to enhance splash near the edges of the wetted area, the gold nanospheres act to lessen such disturbances due to an increase of the solutions’ viscosity, thus increasing the heat flux removed from the spray slightly. The experimental results obtained from this work demonstrate that the maximum heat convection coefficients evaluated for the nanofluids can be 9.8% to 21.9% higher than those obtained with the base fluid and 11.5% to 38.8% higher when compared with those obtained with DI water.

Suggested Citation

  • Miguel Figueiredo & Guido Marseglia & Ana S. Moita & Miguel R. O. Panão & Ana P. C. Ribeiro & Carlo M. Medaglia & António L. N. Moreira, 2020. "Thermofluid Characterization of Nanofluid Spray Cooling Combining Phase Doppler Interferometry with High-Speed Visualization and Time-Resolved IR Thermography," Energies, MDPI, vol. 13(22), pages 1-18, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:22:p:5864-:d:442707
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    References listed on IDEAS

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    1. Gupta, Munish & Singh, Vinay & Kumar, Rajesh & Said, Z., 2017. "A review on thermophysical properties of nanofluids and heat transfer applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 74(C), pages 638-670.
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