2 edition of Particle collisions and coalescence in fluids found in the catalog.
Particle collisions and coalescence in fluids
Iraklis Anestis Valioulis
by Division of Engineering and Applied Science, California Institute of Technology in Pasadena, Calif
Written in English
Thesis (Ph.D.) - California Institute of Technology, 1983.
|Statement||project supervisor: E. John List ; supported by National Oceanic and Atmospheric Administration.|
The method of analysis permits calculation of the primary particle size when growth is collision limited (individual particles colliding), coalescence limited (primary particles coalescing in. The behavior of droplets simulated by SPH for the first time is to study the coalescence of colliding van der Waals liquid droplets , in which cohesive pressure model was used to .
Acevedo-Malavé A, García-Sucre M (a) 3D coalescence collision of liquid drops using smoothed particle hydrodynamics, vol 5. INTECH Publishers, Croatia, pp 85– Google Scholar Acevedo-Malavé A, García-Sucre M () Head-on binary collisions of unequal size liquid drops with smoothed particle hydrodynamics, vol by: 1. Particle Growth by Coalescence and Agglomeration It is assumed that particle growth is determined by coagulation and (viscous flow) coalescence. The morphology of the final particles depends on the temperature history of the formation process. Compact spherical particles and agglomerates may be formed.
We study the dynamics of an air bubble bouncing at a liquid/liquid/gas interface, which we refer to as a compound interface. When a bubble interacts with a thin layer of oil on top of bulk water, the oil layer modifies the interfacial properties and thus the entire process of bouncing and bubble by: 3. dynamics, droplet breakup, collisions and coalescence, and surface tension effects. Lecture Notes Two Fluid Formulation: Conservation of Mass, Momentum and Energy for multiple immiscible phases. Flow Around a Spherical Particle. Stokes Flow, Oseen Correction.
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From the fundamental perspective of col I Ision and coalescence of individual particles. A Monte Carlo technique Is used to investigate the particle size distribution in a suspension of coagulating particles when one or more collision mechanisms operate. The effect of.
Coagulation, in the physical context, is looked upon here first from the fundamental perspective of collision and coalescence of Particle collisions and coalescence in fluids book particles. A Monte Carlo technique is used to investigate the particle size distribution in a suspension of coagulating particles when one or more collision mechanisms by: 1.
Particle Image Velocimetry Collision Rate Exp. in Fluids, 33, – Bröder D., Sommerfeld M. () Examinination of bubble collisions and coalescence in bubbly flows.
In: Sommerfeld M. (eds) Bubbly Flows. Heat and Mass Transfer. Springer, Berlin, by: 1. Request PDF | OnAlejandro Acevedo-Malave and others published 3D Coalescence Collision of Liquid Drops Using Smoothed Particle Hydrodynamics | Find, read and cite all the research.
Coagulation, in the physical context, is looked upon here first from the fundamental perspective of collision and coalescence of individual particles.
A Monte Carlo technique is used to investigate the particle size distribution in a suspension of coagulating particles when one or more collision mechanisms : Iraklis Anestis Valioulis.
Theoretical analysis of fluid particle collisions in turbulent flow. Abstract. Bubble and drop coalescence phenomena observed in many industrial separation processes and in multiphase chemical reactors such as bubble columns and stirred vessels, often have a significant influence on the process by: A range of values for the droplets collision velocity that produces the permanent coalescence of the drops is chosen.
In these references    three possible outcomes for the. This paper studied the evolution of binary droplet collision in liquid and also a mathematical calculation method of coalescence time.
Binary droplet collisions occur in many engineering applications; however, the accurate models to predict the collision. The collision frequency of two equal-size bubbles calculated from various models is shown in Fig.
main difference lies in the calculation of the relative velocity u rel and the modification factors, γ, model of Prince and Blanch predicts a smaller collision frequency, which might be caused by without considering the cross section of the moving by: The bubble coalescence rates at different values of C s (0 ≤ C s ≤ 40 vol%) and d s (60 ≤ d s ≤ μm) at H =, and mm and u g = m/s are shown in Fig.
The bubble coalescence rate increased with increasing solid concentration for different particle sizes (d s = 60,and ).Cited by: For head-on collisions, while permanent coalescence always results for water droplets, the outcome is quite nonmonotonic for the hydrocarbon droplets in that, with increasing droplet Weber number, the collision can result in permanent coalescence, bouncing, permanent coalescence again, and coalescence followed by separation with or without Cited by: The effect of surface energy and fluid turbulence on particle agglomeration has been studied in a channel flow.
It has been found that the turbulent structure of the flow dominates the motion of the particles creating particle-particle interactions. A positive relationship between particle surface energy and agglomeration was also observed. Coalescence separators (Fig.
) are flow-through systems which guarantee a very high degree of separating capacity compared to more simple sophisticated coalescence separators (coolant cleaners) are equipped with pre filters and magnetic separators to clean the emulsion from floating swarf such as aluminum or other light metal fines as well as.
60 J. Qian and C. Law B We (I) Coalescence (V) Off-centre separation (IV) Near head-on separation Figure 1. Schematic of various collision regimes of water droplets in 1 atm. air. Abstract. The constitutive equations proposed in the literature for describing the fluid particle (i.e., bubble and drop) breakage and coalescence phenomena created by turbulence mechanisms are generally limited to the inertial range of scales and infinite Reynolds numbers.
A consistent approach for extending these breakage Cited by: Using free pairs of droplets in the size range from 60 to μ in radius, the effects of charge, velocity, and impact parameter on the collision and the disription of droplets have been examined. The impact parameters for collision and disruption of and 60 μ radius droplets over a charge range from 10 −15 to 10 −12 C per droplet, and with impact velocity Cited by: Book description This book is an introduction to the physics of suspensions of bubbles, droplets, and solid particles in both gases and fluids.
Rather than treating each combination separately, a unified approach is used that permits most particle-fluid combination types to. Coalescence is the process by which two or more droplets, bubbles or particles merge during contact to form a single daughter droplet, bubble or particle.
It can take place in many processes, ranging from meteorology to example, it is seen in the formation of raindrops as well as planetary and star formation. In meteorology, its role is crucial in the formation of rain. But it introduces diffusion when coupled to a Eulerian fluid and is difficult to parallelize.
Collisions and coalescence can be treated in this context. We study the assembling of small gold clusters subject to collisions and close contact coalescence by using molecular dynamics simulations to simulate events that occur typically in the sputtering process of synthesis. Our results support the notion that the kinetics of coalescence processes strongly determine the geometry and structure of the final by:.
This book studies the collision, coalescence and deposition of nanoparticles in stagnation flames. With the help of synthesis experiments, in-situ laser diagnostics and molecular dynamics simulations, it investigates the growth of nanoparticles in .This paper develops a modified smoothed particle hydrodynamics (SPH) method to model the coalescence of colliding non‐Newtonian liquid droplets.
In the present SPH, a van der Waals (vdW) equation of state is particularly used to represent the gas‐to‐liquid phase transition similar to that of a real : Xiaoyang Xu, Xiaoyang Xu, Tingting Tang, Peng Yu.
Acevedo-Malavé A. () Hydrodynamics of Multiple Coalescence Collisions of Liquid Drops: From the Modelling of the Coalescence Phenomenon to Flocculation of Drops in 3D Using the SPH Formalism.
In: Sigalotti L., Klapp J., Sira E. (eds) Computational and Experimental Fluid Mechanics with Applications to Physics, Engineering and the : Alejandro Acevedo-Malavé.