Abstrakti
The effect of surfactants on bubble properties was examined in turbulent conditions. A multi-scale analysis was accomplished with the primary aim to identify the relationship between the size-scale determined surface properties leading to the decrease in bubble size. The adsorption of the surfactants triggers chain reactions acting along different size-scales: it diminishes the tension at the air-liquid interface and increases its surface elasticity (micro/nano-scale; 10−10 to 10−5 m) leading to modified coalescence and breakup properties and lower bubble rise velocity (meso-scale; 10−5 to 10−2 m) that finally result a smaller bubble size (macro-scale; >10−2 m). The weakly surface-active DF200 and Pentanol cause a different change in the dynamic properties of the air-liquid interface compared to the strongly surface-active DF250 and PPG leading to differences in size-scale properties and eventually in bubble size. The main result of this work is a comprehensive picture of the dynamics of surface-active molecules affecting bubble size in the presence of random momentum transfer.
Alkuperäiskieli | Englanti |
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Sivut | 170-178 |
Sivumäärä | 9 |
Julkaisu | Minerals Engineering |
Vuosikerta | 99 |
DOI - pysyväislinkit | |
Tila | Julkaistu - 1 jouluk. 2016 |
OKM-julkaisutyyppi | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä |
Sormenjälki
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Raaka-aineiden tutkimusinfrastruktuuri
Karppinen, M. (Manager)
Kemian tekniikan korkeakouluLaitteistot/tilat: Facility