This research conducts experimental studies on supercavitation bubble development and characteristics within free-surface water the role of cavitator, comparing results to those similar experiments carried in a duct flow. Tests have been conducted cylindrical bodies (47 mm diameter) moving underwater at different velocities 10-m-diameter circular pool about 50 cm level. A comparison has made fo...

This study focusses on investigating the effect of flow orientation global and local two-phase parameters under conditions. Flow visualization, pressure measurement, conductivity probe measurements are performed in a test facility made 50.8 mm inner diameter acrylic pipes with measurement. Characteristics regimes interfacial structures, frictional drop prediction vertical upward downward flows ...

Abstract This paper investigates the growth dynamics of a vapor-gas bubble pressed against heating plate by buoyancy force. The shadow method was used to capture images, which were then automatically processed calculate size bubble. As expected, significantly depends on power. It found that ratio diameter height increases as it grows.

Sonoporation is the membrane disruption generated by ultrasound and has been exploited as a non-viral strategy for drug and gene delivery. Acoustic cavitation of microbubbles has been recognized to play an important role in sonoporation. However, due to the lack of adequate techniques for precise control of cavitation activities and real-time assessment of the resulting sub-micron process of so...

The wall effects on the axisymmetric rise and deformation of an initially spherical gas bubble released from rest in a liquid-filled, finite circular cylinder are numerically investigated. The bulk and gas phases are considered incompressible and immiscible. The bubble motion and deformation are characterized by the Morton number (Mo), Eötvös number (Eo), Reynolds number (Re), Weber number (We)...

Air bubbles are used in chemical, biochemical, environmental, and food process for improving the heat and mass transfer. Due to the dominance of non-Newtonian liquids used in various process industries, an understanding of bubble rise in rheologically complex liquids has grown to be important. An experimental study of the bubble rise velocity and drag co-efficient at high Reynolds number in non...

Recent observations of growing and collapsing bubbles in flows over axisymmetric headforms have revealed the complexity of the ' micro-fluid-mechanics ' associated with these bubbles (van der Meulen & van Renesse 1989; Briangon-Marjollet et al. 1990; Ceccio & Brennen 1991). Among the complex features observed were the bubble-tobubble and bubble-to-boundary-layer interactions which leads to the ...

A one-pot single-step novel process has been developed to form microbubbles up to 250 μm in diameter using a pressurized rotating device. The microbubble diameter is shown to be a function of rotational speed and working pressure of the processing system, and a modified Rayleigh-Plesset equation has been derived to explain the bubble-forming mechanism. A parametric plot is constructed to identi...

Bubble formation is a well identified phenomenon within short (ns) and ultrashort (fs) laser pulses-aqueous media interactions. Bubble formation might be produced by three different mechanisms: (1) optical breakdown, (2) rarefraction wave and (3) overheating of the material. Experiments where transparent and scattering tissue models that mimic biological tissue were irradiated with a Q-switched...