Three-dimensional numerical simulation of axis-switching and micro-droplet formation in a co-flowing immiscible elliptic jet flow system using front tracking method

2020 ◽  
Vol 198 ◽  
pp. 104406
Author(s):  
H. Shahin ◽  
S. Mortazavi
Keyword(s):  
Numerical Simulation ◽  
Flow System ◽  
Three Dimensional ◽  
Front Tracking ◽  
Jet Flow ◽  
Droplet Formation ◽  
Tracking Method ◽  
Front Tracking Method ◽  
Axis Switching

scholarly journals Numerical Simulation of Bubble Free Rise after Sudden Contraction Using the Front-Tracking Method

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Ying Zhang ◽  
Min Lu ◽  
Wenqiang Shang ◽  
Zhen Xia ◽  
Liang Zeng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Reynolds Number ◽  
Front Tracking ◽  
Single Bubble ◽  
Tracking Method ◽  
Front Tracking Method ◽  
Sudden Contraction ◽  
Eotvos Number

Based on the front-tracking method (FTM), the movement of a single bubble that rose freely in a transverse ridged tube was simulated to analyze the influence of a contractive channel on the movement of bubbles. The influence of a symmetric contractive channel on the shape, speed, and trajectory of the bubbles was analyzed by contrasting the movement with bubbles in a noncontractive channel. As the research indicates, the bubbles became more flat when they move close to the contractive section of the channel, and the bubbles become less flat when passing through the contractive section. This effect becomes more obvious with an increase in the contractive degree of the channel. The symmetric contractive channel can make the bubbles first decelerate and later accelerate, and this effect is deeply affected by Reynolds number (Re) and Eötvös number (Eo).

GNBC-based front-tracking method for the three-dimensional simulation of droplet motion on a solid surface

2018 ◽  
Vol 172 ◽  
pp. 181-195 ◽  
Author(s):  
Xinglong Shang ◽  
Zhengyuan Luo ◽  
Elizaveta Ya. Gatapova ◽  
Oleg A. Kabov ◽  
Bofeng Bai
Keyword(s):  
Solid Surface ◽  
Three Dimensional ◽  
Front Tracking ◽  
Droplet Motion ◽  
Tracking Method ◽  
Front Tracking Method ◽  
Dimensional Simulation

Numerical Simulation of Micro-Droplet Formation in a Coflowing Liquid Using Front Tracking Method

2006 ◽  
Author(s):  
Jinsong Hua ◽  
Jing Lou ◽  
Baili Zhang
Keyword(s):  
Front Tracking ◽  
Droplet Formation ◽  
Continuous Phase ◽  
Tension Force ◽  
Drop Formation ◽  
Interface Tension ◽  
Flowing Fluid ◽  
Tracking Method ◽  
Front Tracking Method ◽  
Flowing System

Micro-droplets can be formed when a disperse liquid is injected via a needle nozzle into another immiscible co-flowing fluid. The mode of droplet formation depends on many factors such as liquid flow rates of the inner disperse phase and outer continuous phase, liquid viscosity, nozzle dimensions, interface tension force, etc. In this paper, the drop formation in a co-flowing system is simulated numerically using front tracking method to investigate the drop formation mechanism, which is very critical in the design of micro-fluidic devices for generating micro-droplets in a controllable manner. One set of Navier-Stokes equations for both liquid phases are solved numerically on a fixed Eulerian two-dimensional cylindrical coordinate mesh to account for the flow dynamics, and the front tracking method is applied to track the movement of the interface between the two immiscible liquids as well as the surface tension force. In this set of governing equations for modeling, the effects of flow inertial, capillary, viscous, and gravitational forces are all accounted to explore the droplet formation modes and dynamics in co-flowing system. The simulations reasonably predict the process of droplet formation in the co-flowing liquid. In addition, the effects of the continuous phase flow speed, viscosity and the interface tension force on droplet formation are investigated.

scholarly journals The clustering morphology of freely rising deformable bubbles

2013 ◽  
Vol 721 ◽  
Author(s):  
Yoshiyuki Tagawa ◽  
Ivo Roghair ◽  
Vivek N. Prakash ◽  
Martin van Sint Annaland ◽  
Hans Kuipers ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Front Tracking ◽  
Direct Numerical Simulations ◽  
Regular Lattice ◽  
Tracking Method ◽  
Bubble Deformation ◽  
Front Tracking Method ◽  
Lattice Arrangement ◽  
Spherical Bubbles ◽  
Different Diameters

AbstractWe investigate the clustering morphology of a swarm of freely rising deformable bubbles. A three-dimensional Voronoï analysis enables us to distinguish quantitatively between two typical preferential clustering configurations: a regular lattice arrangement and irregular clustering. The bubble data are obtained from direct numerical simulations using the front-tracking method. It is found that the bubble deformation, represented by the aspect ratio $\chi $, plays a significant role in determining which type of clustering is realized: nearly spherical bubbles form a regular lattice arrangement, while more deformed bubbles show irregular clustering. Remarkably, this criterion for the clustering morphology holds for different diameters of the bubbles, surface tensions and viscosities of the liquid in the studied parameter regime. The mechanism of this clustering behaviour is most likely connected to the amount of vorticity generated at the bubble surfaces.

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