A continuum method for modeling surface tension

Brackbill, J. U.; Kothe, Douglas B.; Zemach, Charles

doi:10.1016/0021-9991(92)90240-y

Cited by 8,289 publications

(4,188 citation statements)

References 17 publications

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“…Where x is the position vector and g acceleration due to gravity Surface tension is accounted for within the momentum equation by including it as a body force, f sv . Surface tension at the liquid gas interface generates an additional pressure gradient, which is evaluated per unit volume using the continuum surface model formulation of Brackbill et al [15]:…”

Section: Fluid Modelmentioning

confidence: 99%

A Numerical Investigation of Through-Tool Coolant Wetting Behaviour in Twist-Drilling

Johns¹,

Merson²,

Royer³

et al. 2017

Proceedings of the 4th International Conference of Fluid Flow, Heat and Mass Transfer (FFHMT'17)

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-Internal coolant channels are a common method of transporting large thermal loads away from the tool in twist-drill machining to increase tool life and to aid chip evacuation and avoid catastrophic tool failure. A finite element model, loosely coupled with a multiphase Computational Fluid Dynamics (CFD) model is used to investigate the distribution of coolant in the bore hole and the effect of channel position on cutting geometry lubrication. The use of response surface models show that all designs do not fully flood the bore hole and that not all areas of the tool geometry are lubricated with coolant. Visual analysis of CFD results show that coolant, for all designs, primarily lubricates the area between the cutting edge and the coolant hole exit, however depending on application requirements coolant channel positioning can be used to modify coolant supply to the axial rake, for chip evacuation or to the cutting edge for heat removal.

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Section: Fluid Modelmentioning

confidence: 99%

A Numerical Investigation of Through-Tool Coolant Wetting Behaviour in Twist-Drilling

Johns¹,

Merson²,

Royer³

et al. 2017

Proceedings of the 4th International Conference of Fluid Flow, Heat and Mass Transfer (FFHMT'17)

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“…The surface tension effect was considered by Brackbill's CSF model formulation [14] which converts surface force to body force as…”

Section: Micro-scale Effectmentioning

confidence: 99%

Filling Behavior of Polymer Melt in Micro Injection Molding for V-Grooves Pattern

Kim¹,

Kim²

2014

Journal of the Korean Society of Manufacturing Technology Engin

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ARTICLE INFO ABSTRACTArticle history:This study uses two numerical approaches to analyze the filling behavior of micro patterns on micro-injection molding for V-grooves pattern which cannot be simulated with conventional CAE packages. The parametric studies have been performed to examine the fidelity of micro patterns with respect to temperature, pressure, inlet velocity and pattern location on the mold according to the boundary condition from the macro pressure and velocity data which can be obtained by conventional CAE packages. Through these numerical approaches, the filling behavior of polymer melt in micro patterns can be understood, the quality of replication can be predicted, and the V-groove pattern can be shaped uniformly during the process of injection molding.

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“…The CSF(continuum surface force) model [15] is used to convert the surface force due to the surface tension effect into the body force.…”

Section: Governing Equations and Solution Strategymentioning

confidence: 99%

Numerical study of flow pattern modulation in a vertical phase separation condenser tube

Sun

Chen

et al. 2013

Chin. Sci. Bull.

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The passive phase separation concept was proposed to modulate flow patterns for heat transfer enhancement. By the flow pattern modulation, the gas tends to be near the wall and the liquid tends to be in the tube core. Experiment has been performed to verify the fresh idea and the flow pattern modulation mechanism was analyzed qualitatively. This paper focuses on the numerical simulation of the bubble dynamics for a single bubble in the vertical phase separation condenser tube to quantitatively explore the flow pattern mechanism, based on a multiscale grid system and the volume-of-fluid (VOF) method. It is found that: (1) the modulated liquid film thickness can be decreased by 70% compared to that in the bare tube region; (2) the modulated bubble traveling velocity can be doubled, causing the increased liquid velocity and velocity gradient in the annular region to weaken the fluid boundary layer; (3) the significantly increased bubble traveling velocity in the annular region promotes the mass and momentum exchange between the annular region and the core region, and yields the self-sustained pulsating flow in the core region. The above three factors are benefit for the performance improvement of the heat transfer facilities. The low grade energy utilization has become a hot area due to the energy shortage and environment problems worldwide. The Organic Rankine Cycle (ORC) is one of the solutions to recover low grade energy (waste heat, solar energy and geothermal energy etc.) [1]. The major problem of ORC is the low thermal efficiency operating at low temperatures. The effective strategy for ORC performance improvement is to decrease the exergy loss for each component and whole system to a maximum degree. For the evaporator and condenser involved in ORC, the temperature difference across the two sides shall be decreased to reduce the exergy loss, yielding the improved heat transfer performance. Usually, the condensation heat transfer coefficient with organic fluid is less than 1 kW/(m 2 K) [2], which is on the same magnitude of that for cooling water flowing in the shell side of the condenser. In other words, the thermal resistances at inside and outside of the tube are almost the same. Thus the enhancement of condensation heat transfer in the tube could significantly improve the condenser performance. With the multi-constraints of the increase of the utilization efficiency for low grade energy, decrease of the exergy loss and reduction of the fabrication cost, new principle and method to enhance the phase change heat transfer shall be developed. The conventional heat transfer enhancement techniques involve the fluid disturbance and the delayed fluid boundary layer development. A micro-grooved tube [3][4][5][6] is one of the examples belonging to these techniques. Usually, gas populates in the tube core and liquid populates near the tube wall, yielding a larger thermal resistance due to the thick liquid thickness near the wall. The phase distribution and

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A continuum method for modeling surface tension

Cited by 8,289 publications

References 17 publications

A Numerical Investigation of Through-Tool Coolant Wetting Behaviour in Twist-Drilling

A Numerical Investigation of Through-Tool Coolant Wetting Behaviour in Twist-Drilling

Filling Behavior of Polymer Melt in Micro Injection Molding for V-Grooves Pattern

Numerical study of flow pattern modulation in a vertical phase separation condenser tube

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