Modelling of two-phase flow in a minichannel using level-set method

Grzybowski, Hubert; Mosdorf, Romuald

doi:10.1088/1742-6596/530/1/012049

Cited by 25 publications

(21 citation statements)

References 8 publications

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“…The location of the interface is determined by the contour of /50.5. This interface is solved for using the following equations 10 :…”

Section: Level-set Methodsmentioning

confidence: 99%

“…2 Extensive research has been performed on this subject during the past centuries and significant progress has been reported on multiple fronts, including analytical modeling, 3,4 the physical mechanism of droplet breakup, 5,6 experimental techniques and observations, [7][8][9] and numerical simulations. [10][11][12][13] J. Eggers (1997) performed a comprehensive review of the breakup in free-surface flows.…”

Section: Introductionmentioning

confidence: 99%

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Droplet formation at megahertz frequency

Miers

Zhou

2016

AIChE Journal

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Droplet formation has been a fascinating subject to scientists for centuries due to its natural beauty and importance to both scientific and industrial applications, such as inkjet printing, reagent deposition, and spray cooling. However, the droplet generation frequency of common drop‐on‐demand (DOD) jetting techniques is mostly limited to ∼10 kHz. This article presents an investigation of the possibility of jetting at megahertz frequencies to boost the productivity of DOD material deposition by ∼100 times. The focus of this article is to understand the limitations of generating droplets at a megahertz frequency and to explore possible solutions for overcoming these limitations. A numerical model is first developed for the simulation of droplet formation dynamics. The numerical model is validated against available experimental data from the literature. Aided by insights gained from scaling analysis, the validated model is then used to study the effects of different parameters on high frequency jetting. The study finds energy density input to the nozzle is the key to achieve megahertz frequency droplet breakup. © 2016 American Institute of Chemical Engineers AIChE J, 63: 2367–2377, 2017

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“…The location of the interface is determined by the contour of /50.5. This interface is solved for using the following equations 10 :…”

Section: Level-set Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Droplet formation at megahertz frequency

Miers

Zhou

2016

AIChE Journal

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“…The area with the positive sign designates the gas. When applied to solve the multiphase flow problem, the level set function must be reinitialized every several iterations to maintain the numerical stability [22] and conserve mass of the phases [23]. In this research, we implement the model with the multiphysics finite element software COMSOL 5.0.…”

Section: Mapping Of Materials Properties With the Geometric Level Setmentioning

confidence: 99%

Numerical Modeling of Metal-Based Additive Manufacturing Using Level Set Methods

Chen

2017

Journal of Manufacturing Science and Engineering

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The advance in computational science and engineering allows people to simulate the additive manufacturing (AM) process at high fidelity, which has turned out to be a valid way to model, predict, and even design the AM processes. In this paper, we propose a new method to simulate the melting process of metal powder-based AM. The governing physics is described using partial differential equations for heat transfer and Laminar flow. Level set methods are applied to track the free surface motion of the molten metal flow. Some fundamental issues in the metal-based AM process, including free surface evolution, phase transitions, and velocity field calculation, are explored, which help us gain insight into the metal-based AM process. The convergence problem is also examined to improve the efficiency in solving this multiphysics problem.

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“…Here, the excess temperature is the difference between the solid surface temperature and the liquid's saturation temperature. interface, and solved by phase field equations [3]- [4].…”

Section: Introductionmentioning

confidence: 99%

Modeling two-phase flow in pipe of the solar collector

Yerdesh

Belyayev

Baiseitov

et al. 2018

Int. j. math. phys.

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Solar collector is often used as evaporator in heat pump system. In the solar collector pipe, liquid is transferred from liquid phase to gas phase. The effective operation of heat pump depends on boiling point of the refrigerant and the process of phase change. Therefore, simulation of two-phase flow in the pipe is considered. In two-phase flow, velocity field and pressure of the liquid phase are characterized by incompressible Navier-Stokes equation and compressible Navier-Stokes equation in the vapor phase. Dynamics of twophase flow is described by Cahn-Hilliard equation to take into account the phase transition. Two-phase flow is solved using finite elements in COMSOL Multiphysics program using phase-field model based on Cahn-Hilliard phase variable equation. The higher the liquid density, the higher the Archimedes force on the vapor, which is the prerequisite for rapid and intense rise from the vapor bubbles. This also explains why the value of oscillation is bigger. This article discusses the two-phase flow of solar collector coolant. Therefore, it is desirable to select the density value so that the liquid is rapidly steamed and fast, i.e., it has low oscillation. Based on these results, we can describe the effect of the liquid phase (density) on phase transitions.

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Modelling of two-phase flow in a minichannel using level-set method

Cited by 25 publications

References 8 publications

Droplet formation at megahertz frequency

Droplet formation at megahertz frequency

Numerical Modeling of Metal-Based Additive Manufacturing Using Level Set Methods

Modeling two-phase flow in pipe of the solar collector

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