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Showing 1 to 16 of 16 for “"electrosprays"”.
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Studies on the physical structure, properties and operation of ionic liquid electrosprays in the pure-ion mode
Electrosprays operating in the pure-ion mode exhibit compelling characteristics for micropropulsion, such as the ability to achieve high specific impulses with high efficiency. Liquid metal and ionic liquid-based electrospray sources are the most well-established types that operate in this mode. …
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A comprehensive numerical procedure for solving the Taylor-Melcher leaky dielectric model with charge evaporation
Electrosprays in the pure-ion mode are of particular interest to space propulsion because of its ability to produce high specific impulse and efficient electrical-to-kinetic energy transformation, together with its simplicity and compactness. Unlike electrospray emitters operating in the droplet …
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Characterization of 1-butanol electrospray combustion
This study examined the characteristics of electrosprays of 1-butanol that burn in air. Still images and high-speed movies captured with a laser sheet present helped to establish general flame phenomenology and features such as shape, size, and stability of the spray flame. The dependence of the …
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Bio-butanol fuel atomization and combustion processes
… and compared with the corresponding electrosprays of ethanol, heptane and butanol-containing mixtures. Electrospray structure was probed using Phase Doppler Anemometry and both droplet size and velocity measurements were obtained for sprays of butanol and butanol-containing fuel …
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On the stability of complex ions in ionic liquid Ion sources
… and negative ions. These liquids can be used in electrosprays to produce ion beams. Ionic liquid ion source (ILIS) beams typically consist of single ions and solvated ions. It has been observed that solvated ions are not always stable and can break up into lighter ions midflight. Past experiments …
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Characterization on a magnetically levitated testbed for electrospray propulsion systems
… at the Space Propulsion Laboratory at MIT. Electrosprays accelerate ions present in the interface between an ionic liquid and vacuum using strong electric fields. Current thrust estimates for the iEPS modules land in the vicinity of tens of [mu]Newtons. Measuring the small thrust produced by …
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Characterization of an iodine-based ionic liquid ion source and studies on ion fragmentation
Electrosprays are a well studied source of charged droplets and ions. A specific subclass is the ionic liquid ion source (ILIS), which produce ion beams from the electrostatically stressed meniscus of ionic liquids. ILIS have several applications, two of which include space propulsion and focused …
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Active Thermal Augmentation and Ultra Dense MEMS-Based Electrospray Thrusters
… the need for bulky and complex neutralizers. Electrosprays still lag behind other forms of electric propulsion, such as Hall Effect Thrusters and Gridded Ion Engines, in thrust density, a key figure of merit for propulsion systems intended for small spacecraft that have limited surface area …
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Molecular dynamics simulations of EMIM − BF4 ionic liquid for electrospray thrusters
… model for higher length scale simulations of electrosprays, such as particle-in-cell. Furthermore, the trajectories of fragmented dimers are analyzed in detail, and the energetic mechanism associated with the fragmentation process is found to be a reduction in the electrostatic interactions …
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CE-microreactor-CE-MS-MS for protein analysis
… development because it provides robust electrosprays and does not cause band broadening. The CZE separation is optimized using bulk solution digested cytochrome C. Peptide-capillary wall interactions are reduced by coating capillaries with poly(vinyl alcohol) and by using high ionic …
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Design Principles and Preliminary Testing of a Micropropulsion Electrospray Thruster Research Platform
… performance that make them an ideal choice. Electrosprays offer high accuracy impulse bits at low power and high efficiency, and have low volume requirements. Design choice reasoning and preliminary testing results are presented for two electrospray thruster designs. The first thruster, named …
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Electrically-assisted evaporation of charged fluids : fundamental modeling and studies on ionic liquids
Electrosprays of the pure-ion variety embody a unique collection of attributes that have compelled interest in derivative technologies across a spectrum of applications ranging from Focused Ion Beams (FIB) to microrocketry. Unlike conventional colloid sources (i.e., so-called cone-jets or others …
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Engineering ionic liquid ion sources for ion beam applications
… can be achieved, in contrast with traditional electrosprays that produce charged droplets, or mixtures of droplets and ions. The PIR provides high current density from a point source, making ionic liquid ion beams suitable for use in focused ion beam (FIB) applications. The use of ionic liquids …
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Estudio numérico de modelos unidimensionales en la interacción fluido-estructura y en la dinámica de chorros y gotas electrificados
… I+D+I Aspectos fundamentales de la operación de electrosprays. Aplicaciones a la producción de nanopartículas y nanoemulsiones. En esta tesis se ha implementado un método numérico robusto para estudiar la dinámica de modelos unidimensionales en diversos problemas de la interacción fluido …
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Use of molecular dynamics simulations to study the impact of weak to strong non-covalent chemical interactions
… to be the most accurate approach for modeling electrosprays, but, it is computationally expensive. The Coulomb potential energy modeled by the DC method in combination with the radial electric fields were found to be necessary to generate the Taylor cone. The differences observed between the …
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Flujos con superficies libres electrospray y generación de burbujas
… con otros resultados de la literatura. Abstract Electrosprays of mixtures of ionic liquids with organic solvents have been studied theoretically and experimentally with a view to determine the activation energy of the ion evaporation process from these liquids and to assess their characteristics …