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Volume of fluid method

About: Volume of fluid method is a research topic. Over the lifetime, 5338 publications have been published within this topic receiving 116760 citations.


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Patent
07 Sep 1988
TL;DR: In this paper, a closed loop control system was proposed for dispensing fluid material whereby the fluid is discharged from a nozzle onto a workpiece and the flow of dispensed fluid is sensed by a pressure transducer disposed to sense the pressure drop across the nozzle.
Abstract: Apparatus and method for dispensing fluid material whereby the fluid is discharged from a nozzle onto a workpiece. Delivery of fluid to the nozzle is controlled by a metering valve located in close proximity to the nozzle. The flow of dispensed fluid is sensed by a pressure transducer disposed to sense the pressure drop across the nozzle. The pressure transducer generates a feedback signal which can be applied by way of a closed loop control system to an electropneumatic servovalve which operates a double-acting air cylinder the pressure drop across the nozzle thereby controlling the flow of dispensed fluid in accordance with a driving signal. Where the dispenser is carried by a robot, the driving signal can be correlated to the relative speed between the workpiece and the nozzle to accurately control the amount of fluid per unit length contained in a bead deposited on the surface of the workpiece. Due to the rapid response of the system such precise control is possible even during relatively rapid changes in the relative speed between the nozzle and the workpiece. Also disclosed are means for insuring that the volume of fluid dispensed over a predetermined interval corresponds to a desired setpoint thereby correcting for changes in the intrinsic viscosity of the dispensed fluid as may be caused by changes in its temperature.

81 citations

Journal ArticleDOI
TL;DR: In this article, both the numerical model and an experimental visualization that can simulate the motion and transport behavior of liquid water in a cathode flow channel of a PEMFC are presented.

80 citations

Journal ArticleDOI
TL;DR: In this paper, a simple co-flowing micro-channel with a cross-sectional area of 169 × 007 mm2 was experimentally and numerically investigated, and the experimental data showed that the break-up process is periodic under certain operating conditions.
Abstract: Bubble generation in a simple co-flowing micro-channel with a cross-sectional area of 169 × 007 mm2 was experimentally and numerically investigated Air and water were used as the gas and liquid, respectively Mixtures of water–glycerol and water–Tween 20 were also used to obtain the effects of viscosity and surface tension The experimental data show that the break-up process is periodic under certain operating conditions The break-up dynamics are also examined using three-dimensional incompressible two-phase flow numerical simulation based on the volume of fluid (VOF) method The simulation successfully predicts the flow behavior and provides a more detailed examination of the bubble shape The physics can be further explained by the detailed micro-PIV measurements, which show that the bubble is formed due to the velocity component perpendicular to the gas flow created by the sudden change of the liquid velocity distribution around the barrier The bubble length L is dependent on the liquid flow rate Ql and the gas flow rate Qg, and the ratio of L to the channel width w is a function of the ratio of gas and liquid flow rates Qg/Ql which is similar to that previously used in the T-junction case The formulation of bubble frequency f is derived under current conditions and it shows a good agreement with the experimental data at the low frequency region Different bubble shapes can be obtained at different liquid viscosities and surface tensions The ratio L/w can still be predicted by a modified equation which uses the real bubble width wb or an equivalent bubble length Le

80 citations

Patent
05 Jul 2010
TL;DR: In this article, a user interface enhancement system that includes a sheet that defines a surface and at least partially defines a fluid vessel arranged underneath the surface, a volume of fluid contained within the fluid vessel that cooperates with the sheet to transmit an image through the sheet without substantial obstruction, a displacement device that influences the volume of liquid within the vessel to expand and retract at least a portion of the vessel, thereby deforming a particular region of the surface.
Abstract: A user interface enhancement system that includes a sheet that defines a surface and at least partially defines a fluid vessel arranged underneath the surface, a volume of fluid contained within the fluid vessel that cooperates with the sheet to transmit an image through the sheet without substantial obstruction, a displacement device that influences the volume of fluid within the fluid vessel to expand and retract at least a portion of the fluid vessel, thereby deforming a particular region of the surface, and an attachment component that couples the sheet to the device is disclosed

80 citations

Journal ArticleDOI
TL;DR: The results obtained show that the proposed analytical method may be as much as three times faster than Brent's iterative method for local volume enforcement.

80 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023315
2022655
2021352
2020345
2019341
2018323