Abstract
In this paper results of an experimental study on critical heat flux in nanofluid at quasi-stationary and stepwise heat generation are presented. Freon R21 with addition of 0.0077 vol.% of SiO 2 nanoparticles was used as test fluid. Boiling curves, critical heat fluxes and temperatures of boiling initiation were obtained for pure fluid and for nanofluid. It was shown that the addition of nanoparticles didn’t affect heat transfer at pool boiling, but critical heat fluxes at quasi-stationary and stepwise heat generation were increased.
Highlights
Boiling is an effective way to remove heat from the surface that is widely used in various technical applications
The increasing requirements for efficiency and miniaturization of equipment give an impetus to the search of methods to intensify heat transfer during boiling and to increase critical heat flux (CHF) [1, 2]
At non-stationary heat release the wall temperature was determined from the numerical solution of the heat equation
Summary
Boiling is an effective way to remove heat from the surface that is widely used in various technical applications. The addition of nanoparticles can significantly increase both the heat transfer coefficient and CHF [3]. There is a necessity in the experiments to be carried out in nanofluids under non-stationary heat release and to simulate different emergency processes (depressurization of devices, removal of rods in nuclear power plants, etc.). The available works demonstrate an increase in non-stationary CHF when adding nanoparticles [4, 5].
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