Wetting of nanofluids with nanoparticles of opposite surface potentials on pristine CVD graphene

Lee, Woorim; Kihm, Kenneth D.; Park, Jae Sung; Lee, Woomin; Kim, Honggoo; Lee, Changhyuk; Cheon, Shinhye; Lim, Gyumin

doi:10.1007/s00348-016-2204-y

Cited by 4 publications

(2 citation statements)

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“…The mass flow rate is of the order of 7 kg/h. during spray impingement, affecting heat transfer [24,25]. Despite the improvements in base fluids' thermal properties, the effect on spray production is still under research.…”

Section: Experimental Apparatus and Working Conditionsmentioning

confidence: 99%

“…Hence, the spray characteristics must be known before its impact to predict better the outcome of impingement, which will affect the heat transfer processes. The nanoparticles may also affect the local wettability during spray impingement, affecting heat transfer [24,25]. Despite the improvements in base fluids' thermal properties, the effect on spray production is still under research.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.

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Section: Experimental Apparatus and Working Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%