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Enhancing thermal mixing in turbulent bubbly flow by adding salt | | Pim Waasdorp
; On Yu Dung
; Sander G. Huisman
; Detlef Lohse
; | | Date: |
1 Sep 2023 | | Abstract: | The presence of bubbles in a turbulent flow changes the flow drastically and
enhances the mixing. Adding salt to the bubbly aqueous flow changes the bubble
coalescence properties as compared to pure water. Here we provide direct
experimental evidence that also the turbulent thermal energy spectra are
strongly changed. Experiments were performed in the Twente Mass and Heat
Transfer water tunnel,in which we can measure the thermal spectra in bubbly
turbulence in salty water. We find that the mean bubble diameter decreases with
increasing concentration of salt (NaCl), due to the inhibition of bubble
coalescence. With increasing salinity, the transition frequency from the
classical $-5/3$ scaling of the thermal energy spectrum to the bubble induced
$-3$ scaling shifts to higher frequencies, thus enhancing the overall thermal
energy. We relate this frequency shift to the smaller size of the bubbles for
the salty bubbly flow. Finally we measure the heat transport in the bubbly
flow, and show how it varies with changing void fraction and salinity:
Increases in both result into increases in the number of extreme events. | | Source: | arXiv, 2309.00400 | | Services: | Forum | Review | PDF | Favorites | |
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