Generation of Coarse Bubbles and Flow Instability Control by Means of a Bubble Generator
Inna Levitsky
Shamoon College of Engineering, Department of Chemical Engineering, Green Processes Center, PO Box 950, 84100 Beer-Sheva, Israel
Ben-Gurion University of the Negev, Unit of Environmental Engineering, PO Box 653, 84105 Beer-Sheva, Israel
Search for more papers by this authorVitaly Gitis
Ben-Gurion University of the Negev, Unit of Energy Engineering, PO Box 653, 84105 Beer-Sheva, Israel
Search for more papers by this authorCorresponding Author
Dorith Tavor
Shamoon College of Engineering, Department of Chemical Engineering, Green Processes Center, PO Box 950, 84100 Beer-Sheva, Israel
Correspondence: Dorith Tavor ([email protected]), Shamoon College of Engineering, Department of Chemical Engineering, Green Processes Center, PO Box 950, Beer-Sheva 84100, Israel.Search for more papers by this authorInna Levitsky
Shamoon College of Engineering, Department of Chemical Engineering, Green Processes Center, PO Box 950, 84100 Beer-Sheva, Israel
Ben-Gurion University of the Negev, Unit of Environmental Engineering, PO Box 653, 84105 Beer-Sheva, Israel
Search for more papers by this authorVitaly Gitis
Ben-Gurion University of the Negev, Unit of Energy Engineering, PO Box 653, 84105 Beer-Sheva, Israel
Search for more papers by this authorCorresponding Author
Dorith Tavor
Shamoon College of Engineering, Department of Chemical Engineering, Green Processes Center, PO Box 950, 84100 Beer-Sheva, Israel
Correspondence: Dorith Tavor ([email protected]), Shamoon College of Engineering, Department of Chemical Engineering, Green Processes Center, PO Box 950, Beer-Sheva 84100, Israel.Search for more papers by this authorAbstract
A previously studied bubble generator was tested under new operating conditions to provide for millimeter-sized bubbles. The basic element of the generator is a vortex chamber with water supplied through tangential ducts while gas (air) is introduced in the radial direction. Bubbles with average diameter of 0.5–2.2 mm were produced and registered by high-speed photography. The correlation between the water-air flow rate ratio and the characteristic bubble diameter was established and described by a relationship. Pressure oscillations in the exit section of the device were captured for two-phase flows with fine and coarse bubbles. With a view to applications in membrane filtration and water treatment, the effect of a pin installed in the exit section of the vortex chamber on the pressure oscillations was studied. The pin results in a drastic increase in pressure amplitude, both in the flow without bubbles and in the case of gas supply.
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