Experimental study of a universal CHF enhancement mechanism in nanofluids using hydrodynamic instability
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- Experimental study of a universal CHF enhancement mechanism in nanofluids using hydrodynamic instability
- Park, Seong Dae; Bang, In Cheol
- Boiling; Critical heat flux; Nanofluid; Rayleigh-Taylor instability
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.70, no., pp.844 - 850
- Pool boiling tests were designed and performed to confirm the relation between the enhancement of critical heat flux (CHF) in nanofluids and the development of a hydrodynamic instability on the test heater surface from the deposition of nanoparticles during boiling. These pool boiling experiments were carried out under atmospheric pressure using a 0.49 mm diameter cylindrical Ni-Cr wire as a heating element with ZnO, SiO2, SiC, Al 2O3, graphene oxide and CuO nanoparticles at 0.01% volume concentration. The test fluids are distilled water and R-123. The CHF value for each nanofluid is obtained and compared with the measured Rayleigh-Taylor wavelength. Higher CHF results have shorter Rayleigh-Taylor wavelengths in all cases. We propose a modified theoretical model for hydrodynamic instability that incorporates these effects and fits experimental results.
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