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Article

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

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IN+, Mechanical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
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Research Department, Università degli Studi Link Campus University of Rome, Via del Casale di San Pio V, 44 0016 Rome, Italy
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Escuela Técnica Superior de Arquitectura de Sevilla, Av. de la Reina Mercedes, 2, 41012 Seville, Spain
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Instituto de Matemáticas de la Universidad de Sevilla, (IMUS), Universidad de Sevilla, Avenida Reina Mercedes, 41012 Seville, Spain
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CINAMIL, Department of Exact Sciences and Engineering of the Portuguese Military Academy, Rua Gomes Freire, 203, 1169-203 Lisbon, Portugal
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ADAI, LAETA, Mechanical Engineering Department, University of Coimbra, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal
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Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
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Authors to whom correspondence should be addressed.
Energies 2020, 13(22), 5864; https://doi.org/10.3390/en13225864
Received: 22 October 2020 / Revised: 8 November 2020 / Accepted: 9 November 2020 / Published: 10 November 2020
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. View Full-Text
Keywords: nanofluids; spray cooling; heat transfer; thermophysical properties; spray characterization nanofluids; spray cooling; heat transfer; thermophysical properties; spray characterization
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MDPI and ACS Style

Figueiredo, M.; Marseglia, G.; Moita, A.S.; Panão, M.R.O.; Ribeiro, A.P.C.; Medaglia, C.M.; Moreira, A.L.N. Thermofluid Characterization of Nanofluid Spray Cooling Combining Phase Doppler Interferometry with High-Speed Visualization and Time-Resolved IR Thermography. Energies 2020, 13, 5864. https://doi.org/10.3390/en13225864

AMA Style

Figueiredo M, Marseglia G, Moita AS, Panão MRO, Ribeiro APC, Medaglia CM, Moreira ALN. Thermofluid Characterization of Nanofluid Spray Cooling Combining Phase Doppler Interferometry with High-Speed Visualization and Time-Resolved IR Thermography. Energies. 2020; 13(22):5864. https://doi.org/10.3390/en13225864

Chicago/Turabian Style

Figueiredo, Miguel, Guido Marseglia, Ana S. Moita, Miguel R.O. Panão, Ana P.C. Ribeiro, Carlo M. Medaglia, and 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 13, no. 22: 5864. https://doi.org/10.3390/en13225864

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