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...

Frothers havea profoundeffectonbubble size and also flotation efficiency. In present study the effect of type and dosage of frothers on the flotation response of coarse particles of quartz was investigated.  Therefore, flotation response of coarse particles using frothers such as MIBC, pine oil, poly propylene glycol with concentration of 0, 25, 50 and 75...

In this study, direct numerical simulation for the bubble condensation in the subcooled boiling flow was performed. The main goal was to develop the CFD modeling for the bubble condensation and to evaluate the accuracy of the VOF model with the developed CFD modeling. CFD modeling for the bubble condensation was developed by modeling the source terms in the governing equations of VOF model usin...

Material deformation and pitting from cavitation bubble collapse is investigated using fluid and material dynamics and their interaction. In the fluid, a novel hybrid approach, which links a boundary element method and a compressible finite difference method, is used to capture non-spherical bubble dynamics and resulting liquid pressures efficiently and accurately. The bubble dynamics is intima...

This paper presents a 3D numerical study of the bubble generation process in a T-junction, performed with the commercial Computational Fluid Dynamics solver ANSYS Fluent v15.0.7. Numerical results on bubble generation frequency, bubble velocity, volume void fraction, bubble volume, and characteristics bubble lengths are compared with experimental data. Additionally, a new simple tting for the b...

where H > 0 is a given constant, y : dR + R3 is a given function and r c R3 is a given oriented Jordan curve. If u is a solution of (H)-(P), then u ( a ) represents a “soap bubble”, that is, a surface with mean curvature H (at all points x c R where V u ( x ) # O ) spanning r. Let us assume that y(aR) (respectively r) is contained in a closed ball of radius R. It was proved by S. Hildebrandt [8...

We propose Bubble-Sensing, a new sensor network abstraction that allows mobile phones users to create a binding between tasks (e.g., take a photo, or sample audio every hour indefinitely) and the physical world at locations of interest, that remains active for a duration set by the user. We envision mobile phones being able to affix task bubbles at places of interest and then receive sensed dat...

The transport of bubbles to a neighboring surface is very important in surface chemistry, bioengineering, and ultrasonic cleaning, etc. This paper proposes a multi-bubble transport method by using an acoustic standing wave field and establishes a model that explains the multi-bubble translation by expressing the balance between Bjerknes forces and hydrodynamic forces on a bubble in a liquid med...

Bubble-propelled catalytic micromotors have recently been attracting much attention. A bubble-propulsion mechanism has the advantage of producing a stronger force and higher speed than other mechanisms for catalytic micromotors, but the nature of the fluctuated bubble generation process affects the motions of the micromotors, making it difficult to control their motions. Thus, understanding of ...

Two-dimensional micro-bubble actuator arrays were developed and studied in detail to enhance the hybridization kinetics of a DNA micro-biosensor. The hybridization between a molecular beacon, a kind of oligonucleotide probe, and its complement was investigated in a millimeter-sized PDMS based reaction chamber, where various 2D micro-heater arrays were distributed on the bottom for micro-bubble ...