Extension of local front reconstruction method with controlled coalescence model

Rajkotwala, A.H.; Mirsandi, H.; Peters, E.A.J.F.; Baltussen, M.W.; Geld, C.W.M. van der; Kuerten, Johannes G.M.; Kuipers, J.A.M.

doi:10.1063/1.5008371

Cited by 24 publications

(22 citation statements)

References 29 publications

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“…It can be concluded that the Diffuse Interface Model gives detailed insight into droplet collision dynamics, which leads to a better understanding of the process. The results of simulations of droplet collisions with DIM can be used to either validate or improve coalescence models employed in sharp interface methods [18,31]. It must be noted, however, that the temperature range in which DIM can be used is severely limited by a constraint on the grid spacing caused by the fact that the liquid-vapor interface becomes very thin when the temperature is far from the critical point.…”

Section: Discussionmentioning

confidence: 99%

“…It should also be noted that when other multiphase simulation methods are used to simulate droplet collisions, the total amount of energy is not guaranteed to be conserved. A decrease in the total amount of energy is observed during the collision process in the following studies: Nobari et al [24], Rieber and Frohn [33], Sun et al [41] and Rajkotwala et al [31]. The loss in total energy can be as high as 20% and is usually caused by an equivalent loss in interfacial energy due to a sudden reduction of interfacial area.…”

Section: Energy Transfer and Dissipationmentioning

confidence: 96%

“…The Level-set method has similar problems: coalescence either happens automatically or it is not possible unless it is explicitly imposed [18]. In the front-tracking method, the coalescence process requires a specialized routine that relies on an empirical parameter called the film drainage time [31].…”

Section: Introductionmentioning

confidence: 99%

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Simulations of droplet collisions with a Diffuse Interface Model near the critical point

Gelissen

Geld

Kuipers

et al. 2018

International Journal of Multiphase Flow

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Section: Discussionmentioning

confidence: 99%

Section: Energy Transfer and Dissipationmentioning

confidence: 96%

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Simulations of droplet collisions with a Diffuse Interface Model near the critical point

Gelissen

Geld

Kuipers

et al. 2018

International Journal of Multiphase Flow

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“…The numerical model used in the present work is based on the LFRM, originally developed by Shin et al (2011) and extended by Mirsandi et al (2018) and Rajkotwala et al (2018). The main characteristics of the numerical model are described in the section below.…”

Section: Methodsmentioning

confidence: 99%

Influence of wetting conditions on bubble formation from a submerged orifice

et al. 2020

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The formation of gas bubbles by submerged orifices is a fundamental process encountered in various industrial applications. The dynamics of the contact line and the contact angle may have a significant influence on the detached bubble size depending on the wettability of the system. In this study, the influence of wetting conditions on the dynamics of bubble formation from a submerged orifice is investigated experimentally and numerically. The experiments are performed using a hydrophobic orifice plate and a series of ethanol-water solutions to vary the wettability where the key characteristics of the bubbles are measured using a high-speed, high-resolution camera. An extensive analysis on the influence of wetting conditions on the bubble size, bubble growth mechanism and the behavior of the contact line is given. Bubble growth stages, termed (1) hemispherical spreading, (2) cylindrical spreading, (3) critical growth and (4) necking, are identified based on key geometrical parameters of the bubble and relevant forces acting on the bubble during the growth. The experimental results show that the apparent contact angle varies in a complicated manner as the bubble grows due to the surface roughness and heterogeneity. The experimental findings are finally used to validate the local front reconstruction method with a contact angle model to account for the contact angle hysteresis observed in the experiments.

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“…A time series showing a head-on separation of two colliding drops can be appreciated in Fig. 18 (the first two panels are obtained from numerical simulations [231,261], while the third from experimental measurements [260]). For intermediate values of the impact parameter, the smaller normal component of the impingement inertia reduces the internal flow responsible for the separation [260] and permanent coalescence is obtained (regime III, coalescence with high deformation).…”

Section: Drop Size Distribution and Advancementsmentioning

confidence: 99%

Turbulent Flows With Drops and Bubbles: What Numerical Simulations Can Tell Us—Freeman Scholar Lecture

Soligo

Roccon

Soldati

2021

Journal of Fluids Engineering

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Turbulent flows laden with large, deformable drops or bubbles are ubiquitous in nature and in a number of industrial processes. These flows are characterized by a physics acting at many different scales: from the macroscopic length scale of the problem down to the microscopic molecular scale of the interface. Naturally, the numerical resolution of all the scales of the problem, which span about eight to nine orders of magnitude, is not possible, with the consequence that numerical simulations of turbulent multiphase flows impose challenges and require methods able to capture the multi-scale nature of the flow. In this review, we start by describing the numerical methods commonly employed and discussing their advantages and limitations, and then we focus on the issues arising from the limited range of scales that can be possibly solved. Ultimately, the droplet size distribution, a key result of interest for turbulent multiphase flows, is used as a benchmark to compare the capabilities of the different methods and to discuss the main insights that can be drawn from these simulations. Based on this, we define a series of guidelines and best practices that we believe important in the simulation analysis and in the development of new numerical methods.

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Extension of local front reconstruction method with controlled coalescence model

Cited by 24 publications

References 29 publications

Simulations of droplet collisions with a Diffuse Interface Model near the critical point

Simulations of droplet collisions with a Diffuse Interface Model near the critical point

Influence of wetting conditions on bubble formation from a submerged orifice

Turbulent Flows With Drops and Bubbles: What Numerical Simulations Can Tell Us—Freeman Scholar Lecture

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