165 results about "Droplet flow" patented technology

Gas containing particles or droplets flowing continuously through a microphone is perturbed by sound waves. Sound-induced localized pressure changes in the gas are measured by detecting variations in gas opacity with an optical transducer disposed transverse to the flow direction.

A jet break-off length control apparatus for a continuous liquid drop emission system is provided. The jet break-off length control apparatus comprises a liquid drop emitter containing a positively pressurized liquid in flow communication with at least one nozzle for emitting a continuous stream of liquid. Resistive heater apparatus is adapted to transfer pulses of thermal energy to the liquid in flow communication with the at least one nozzle sufficient to cause the break-off of the at least one continuous stream of liquid into a stream of drops of predetermined volumes. A sensing apparatus adapted to detect the stream of drops of predetermined volumes is provided. The jet break-off length control apparatus further comprises a control apparatus adapted to calculate a characteristic of the stream of drops of predetermined volumes and adapted to provide a break-off length calibration signal to the resistive heater apparatus wherein the break-off length calibration signal is determined at least by the characteristic of the stream of drops of predetermined volumes. Further apparatus is adapted to inductively charge at least one drop and to cause electric field deflection of charged drops. The present inventions are additionally configured to control break-off lengths for a plurality of streams of drops of predetermined volumes by determining a break-off length calibration signal that contains information specific to the plurality of streams of drops of predetermined volumes. Jet stimulation apparatus comprised of a plurality of thermomechanical or electromechanical transducer devices that transfer mechanical energy to the fluid are claimed. Methods of controlling the jet break-off length are also disclosed.

Nozzles and nebulizers able to produce aerosol with optimum and reproducible quality based on feedback information obtained using laser imaging techniques. Two laser-based imaging techniques based on particle image velocimetry (PTV) and optical patternation map and contrast size and velocity distributions for indirect and direct pneumatic nebulizations in plasma spectrometry. Two pulses from thin laser sheet with known time difference illuminate droplets flow field. Charge coupled device (CCL)) captures scattering of laser light from droplets, providing two instantaneous particle images. Pointwise cross-correlation of corresponding images yields two-dimensional velocity map of aerosol velocity field. For droplet size distribution studies, solution is doped with fluorescent dye and both laser induced florescence (LIF) and Mie scattering images are captured simultaneously by two CCDs with the same field of view. Ratio of LIF / Mie images provides relative droplet size information, then scaled by point calibration method via phase Doppler particle analyzer.

An apparatus for controlling droplets allows the phase difference between a calibration signal and its signature signal on a detector to be minimized, or the amplitude of the signature signal to be maximized, by adjusting the droplet charging means of the device, or the droplet generation means, and the signals on either. The apparatus converts a stream of fluid into a stream of droplets under the influence of a droplet stimulation signal imposed onto the droplet generating means. Droplets are subsequently signal-wise charged under the influence of a droplet charging signal imposed on the droplet charging means. The charged droplets are then deflected. The calibration signal is imposed onto the stream of droplets. The calibration signal has characteristics that do not appreciably affect the trajectory of the stream of droplets, thereby ensuring that the placement accuracy of the individual droplets is a maintained. The calibration signal further has a signal phase that is independent of the droplet charging signal. A charge detection means is used to extract a charge detection signal from the at least a part of the droplets. The charge detection signal is filtered to extract a signature signal of the calibration signal. The phase control system then varies at least one of the droplet generation means, droplet stimulation signal, droplet charging means and droplet charging signal until the phase between the signature signal and the calibration signal is minimized. A plurality of streams of droplets may be controlled by the method of the invention.

A device and method for sorting microparticles including a nozzle for a separating stream, with a vibration generator for the dispersion of the separation flow into a droplet flow with a deflector device for separation of the droplet flow into a through flow and at least one side flow depending on signals from an analytical device configured to analyze the microparticles (s) contained in the droplets and to control the deflector device. Also provided is a protective chamber in which at least the nozzle, the oscillation generator and the deflector device are arranged. The analytical device is outside the safety cabinet wherein the protective chamber is part of the safety cabinet with a clean chamber and a monitoring device through which the signals of the microparticles arising from the separating stream are supplied to the detectors of the analytical device, arranged outside the safety cabinet.

The purpose of the present invention is to provide a mass spectrometer device with a high detection sensitivity, achieved by efficiently vaporizing a sprayed sample solution in order to generate charged microdroplets and thereby improve the efficiency of sample ionization, and to reduce large droplets with high ionic strength. The present invention is a liquid chromatography mass spectrometer device having: a liquid chromatographic separation means which separates a sample solution into the respective components thereof, a sample spraying unit which sprays, as droplets, the sample solution separated and eluted by the liquid chromatographic separation means, an ion generation means which generates ions by charging the droplets (droplet charging), a mass spectrometer unit which receives and separates the ions, and a desolvation unit which removes the solvent contained in the charged droplets. The present invention is characterized by the desolvation unit having a desolvation flow chamber through which the charged droplets flow, a heating means which heats the desolvation flow chamber, and a helical droplet conduit provided in the desolvation flow chamber.

The present invention relates to a vortex flow measuring device (2) for monitoring and / or measuring an at least intermittently two-phase medium flowing in a pipeline, which medium comprises an in particular gaseous first phase having a first density and a second in particular particulate or droplet phase having a second density different from the first density, wherein the vortex flow measuring device (2) comprises at least one measurement pipe (4) that can be inserted into a pipeline, a bluff body (8), and a vortex sensor (24) that responds to pressure oscillations that occur.; The vortex flow measuring device (2) comprises an acoustic transducer (20), which is integrally designed in a component (8) of the vortex flow measuring device that protrudes into a flow path inside the measurement pipe (4), in particular in the bluff body (8), in such a way or is acoustically coupled to said component (8) in such a way that acoustic signals generated by the impact of particles and / or droplets of the second phase onto the component (8) can be converted into electrical signals by the acoustic transducer (20).