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This paper describes the use of optimal control theory applied to the motion of a low-power laser beam to precisely move a droplet in a liquid layer by means of the force on the liquid-liquid interface arising due to the surrounding thermal field (thermocapillary force and Marangoni effect). The form of heat field equations is approximated by the solution of a finite sum of laser pulses, whose analytical...
In work the problem of handling of experimental data on wetting is studied by fusions of firm substrates. The algorithm of the automated matter research is offered. In an analysis result of the made natural experiments and theoretical researches the offered method allows to minimize an error of measurements in case of reduction of time expenditure by handling of images of small drops of fusions.
In this study, the phenomena of multiple droplet impingements are investigated and observed experimentally. A high-speed camera was used to capture sequential images of multiple droplet impingements. Image processing technique was used to analyze the images from a high-speed camera. The effect of droplet frequency and Weber number to spreading ratio are investigated. The result of this study shows...
The US Department of Energy has formulated various sets of gasoline fuels, called fuels for advanced combustion engines (FACE), which are consistent in composition and properties. The analysis of heating and evaporation of FACE A gasoline fuel (paraffin-rich) is studied by replacing the 66 components with 19 components to represent this fuel. The reduction in the number of components is based on merging...
In combustion devices involving direct injection of low-volatility liquid fuels (e.g., bio-oils from pyrolysis process), transient heating and vaporization of fuel droplets is a controlling factor in ignition and combustion of the fuel vapor/air mixture. As a result, some experimental and numerical efforts have been made on this topic. In this paper, a comprehensive 3D model that addresses the internal...
Optical methods for droplet manipulation are attractive because they offer dynamic control without on-chip structures; however, forces from optical tweezers tend to be in the pN range. We demonstrate the trapping of oil-in-water droplets on a focused laser beam via using Marangoni optofluidic tweezers (MOT). MOR exploits Marangoni flow generated by a laser-induced temperature singularity at the oil-water...
The requirements for a polymerase chain reaction (PCR) microchip are reduction in reaction time and PCR reagent volume. In this paper, we describe the design and experimental studies of a droplet-based PCR by electrowetting on a dielectric (EWOD) chip by using the droplet basis to reduce PCR reagent volume. The droplet-based PCR system consists of a single-plate EWOD device and serpentine-shape microheaters...
We developed the novel type of droplet generator for the bio-chemical reactions, and designed it by considering Reynolds and Weber numbers. The Si droplet generator was fabricated on a silicon-on-insulator wafer by using deep-reactive ion etching and was fixed in a piece of heat-shrinkable tubing by heating the tubing. We experimentally confirmed that the fabricated droplet generator formed droplets...
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