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Thermodynamic effects during growth and collapse of a single cavitation bubbleDular, Matevž ; Coutier-Delgosha, OlivierThe thermodynamic effects associated with the growth and collapse of a single cavitation bubble are investigated in the present paper by an experimental approach. The study focuses on the temperature ... variations in the liquid surrounding the bubble. Experiments are conducted in a cylinder partially filled with water at an ambient temperature and atmospheric pressure. The bubble growth results from the expansion of an initial air bubble, due to the pressure wave generated by a so-called tube-arrest method. Several locations of the bubble, at different distances from the bottom wall of the cylinder, are considered. The bottom wall is made of sapphire, which is transparent to both the visible and infrared light spectra which enables temperature measurements by a high-speed thermovision camera at a wavelength of 35 m. Water is opaque to the infrared light spectrum, hence only temperatures in the boundary layer and on the liquid vapour interface could be determined. A temperature decrease of 3 K was recorded during the bubble growth while an increase up to 4 K was detected during the collapse. Experimental results are compared to the predictions of the thermal delay model based on the assumption that the bubble growth and collapse are due to phase changes only. In this approach, the temperature variations are related to the latent heat exchanges during the vapourization and condensation processes. On the basis of these results, the respective effects of phase change and air dilatation/compression in the bubble dynamics are discussed.Source: Journal of Fluid Mechanics. - ISSN 0022-1120 (Vol. 736, Dec. 2013, str. 44-66)Type of material - article, component partPublish date - 2013Language - englishCOBISS.SI-ID - 13196827
Author
Dular, Matevž |
Coutier-Delgosha, Olivier
Topics
cavitation |
bubbles |
drops |
thermodynamics |
phase change |
kavitacija |
mehurčki |
kapljice |
termodinamika
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Dular, Matevž | 23471 |
Coutier-Delgosha, Olivier | ![]() |
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