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Showing 1 to 20 of 28 for “"Weber number"”.
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Experimental Investigation of Jet Breakup at Low Weber Number
… into a stagnant ambient atmosphere at low Weber number, is presented in this thesis. The process of breakup of the liquid jet was captured using a real-time image processing high-speed digital camera system. In order to understand the influence of inertial, surface tension, and viscous …
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LATTICE BOLTZMANN SIMULATION OF BINARY DROP COALESCENCE AT LOW WEBER NUMBER
… The two drops approach each other at a very low Weber number (We) and the coalescence process is driven by surface tension. When the two drops come into contact, the curvature diverges and causes infinitely large surface tension forces, leading to the formation of a rapidly growing liquid bridge. …
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Theoretical and numerical study of air entrainment and bubble size distribution in strong free-surface turbulent flow at large Froude and Weber number
… characterized by large Froude (Fr) and Weber number (We), leads to significant interactions and exchanges between gas and liquid, resulting in measurable air entrainment. Air entrainment influences a number of physical processes in the nature, including air-sea gas transfer, production …
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CHARACTERIZATION OF THE INITIAL SPRAY FROM A JET IN CROSSFLOW
… (PIV) techniques. Momentum ratio and gas Weber number were varied to study their effects on the column trajectory, spray trajectory, breakup locations and spray characteristics after column breakup. Correlations for column trajectory, spray trajectory, breakup locations in terms of …
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A novel method of producing microbubbles for targeted drug delivery.
… are dependent on the ratio of inner- to outer Weber number.
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Development, Evaluation and Improvement of Correlations for Interphase Friction in Gas-Liquid Vertical Upflow
… interphase friction force as a function of the Weber number, the Froude number and the mixture Froude number. Statistical analysis of the three correlations shows that the mixture Froude number correlation should be the most accurate correlation. The correlations have a weakness that makes them …
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Experimental study of flow boiling under subatmospheric pressures in a vertical square channel
… nucleation characteristics, specifically Boiling number, Jakob number, and density ratio. Bubble departure diameters and departure frequencies are measured via high-speed photography and compared to existing models. CHF data are presented as a parametric study of pressure from 20 kPa to 108 kPa, …
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Mean-Field Free-Energy Lattice Boltzmann Method for Liquid-Vapor Interfacial Flows
… three LBM models are validated successfully in a number of analytical solutions of liquid-vapor interfacial flows. Second, we have shown that the common bounceback condition in the literature leads to an unphysical velocity at the wall in the presence of surface forces. A few new consistent mass …
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The influence of vapor pressure on droplet contact dynamics on smooth surfaces.
… It was observed that while increasing the Weber number of the impacting droplets generally lead to sooner air film failure, there was significant variance in the magnitude of the contact times at the same Weber numbers for different fluids. It is hypothesized that the vapor output from the …
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Spray generation
… image analysis software. The liquid jet Reynolds number ranged from 3.5x1O(4) to 8.5xlO(4), the Froude number from 8 to 30, and the Weber number from 2,000 to 7,500. The vertical positions, velocities and accelerations of several ligaments from inception to drop formation as well as the …
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Numerical Simulation of a Liquid Jet Atomization and Break-Up Using ANSYS-CFX 12.0
… time and distance, Sauter Mean Diameter, Weber number, JetA Liquid Average Velocity and the turbulence kinetic energy.</p>
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Spreading behavior of molten metal microdroplets
… radius, the perturbation onset time, and the Weber number on the analysis results are examined. The analysis shows that the wave number of maximum instability does not remain constant but rather, changes during spreading because of time-dependent coefficients in the amplitude equation. A large …
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Crystallization kinetics of polymer melts in extensional flow
… suspended in a carrier phase at low Reynolds number and high Weber number was documented. It is recommended that the 4-Roll Mill technique be used for study of other crystallizable polymer systems.
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Characterization and scale-up of microbubble generation in column flotation
… geometry and a dimensionless term known as the Weber number. Tests have also been conducted to determine the reduction in the performance of centrifugal pumps under air admitting conditions. A semi-empirical pump model has been utilized which allows the proper size of pump to be selected for …
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Non-coalescence of Jets
… value of the dimensionless parameter Normal Weber Number, which represents the ratio between inertial and surface tension forces. A parametric study of the characteristic of bouncing jets, conducted by varying the nozzle diameter, jet velocity, angle of inclination and fluid viscosity reveals …
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Numerical Investigation on Shape Impact of Deformable Droplets on Evaporation and Combustion: Method Development and Characterization
… forced convective flow at moderate Reynolds numbers are noteworthy. The droplet shape under such flow conditions is governed by Weber number (We) which is a ratio of inertial force to surface tension force. The results demonstrated upto 20% en- hancement in total evaporation rate for highly …
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Droplet Drag Modeling on Spray Conditions
… theory to account for the effect of the Weber number and fluid properties on droplet deformation.
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Direct numerical simulation of free-surface and interfacial flow using the VOF method: cavitating bubble clouds and phase change
… pore competition, which is characterised by the Weber number in the ow. In the second part of the study the governing equations are extended to describe incompressible ow with phase change. The description of the work commences with the derivation of the governing equations. Following this, a …
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Effects of power-law entrainment on bubble fragmentation cascades
… distribution 𝑁(𝑎,𝑡) of large bubbles (Weber number 𝑊𝑒 >> 1) under free-surface entrainment described generally by an entrainment size distribution 𝐼(𝑎) with power-law slope 𝛾 and large-radius cutoff 𝑎ₘₐₓ. The focus is the interaction between turbulence-driven fragmentation and …
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Spray and Single Droplet Impingement on a Wall
… only sensitive to variations in film height and Weber number not Reynolds number. Lastly, the formation and evolution of a liquid film produced by impingement are modeled numerically. The governing equations for the film are derived and are subsequently solved using a particle method. It is shown …
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