摘要:
An improved microfluidic device and method of using the microfluidic device to measure natural motile response of a living moiety to a chemotactic agent. The invention comprises integrating microfluidic containment trenches within the microfluidic devices for cellular trapping, manipulation and real-time analysis of biological phenomena, including chemotaxis. The invention captures the design methodology for these traps, as well as the fabrication means and the associated external control mechanism that allows rapid, reversible and fully controlled changes in the chemical environment to which trapped cells are exposed.
摘要:
In a static micromixer which comprises at least one mixing chamber and one guide component disposed upstream of the mixing chamber and which includes channels extending therethrough at an angle to the longitudinal axis of the micromixer, so that the channels of alternate layers intersect without communicating with each other, the cross-section of the channels decreases steadily from the entrance end to the exit end of the guide component so as to reduce the pressure losses of the fluid flowing through the channels for mixing in the mixing chamber.
摘要:
A homogenization apparatus for intermixing insoluble components, such as fuel oil and water, comprising a first compensating valve and homogenizing orifice where initial intermixing of the two components occurs, pump means, a high pressure chamber, and a second compensating valve and homogenizing orifice where secondary mixing occurs. The first compensating valve adjusts the first orifice responsive to downstream pressure, while the second compensating valve adjusts the second orifice responsive to upstream pressure.
摘要:
The liquid feed injector as hereindescribed uses sequential stages of increased severity mixing to fully atomize a liquid portion of a combined liquid and gaseous stream. Sequential mixing consists of a first mild mixing that takes place in a mild mixing zone and blends the liquid and gaseous material into a substantial uniform mixture. The uniform mixture of liquid and gaseous material passes through another stage of vigorous mixing where the liquid is sheared and gas is dispersed throughout the liquid by dividing the mixture into a plurality of small streams and directing the projection of the streams into impingement with an impact medium to produce a homogeneous mixture of fine gas bubbles dispersed in the liquid. The homogeneous liquid and gas mixtures are then discharged through one or more discharge nozzles to effect atomization and distribution of the liquid in a suspension of fluidized solids. The sequential stages of increased severity mixing allow atomization of the liquid into fine droplets with a reduced pressure drop across the discharge nozzles. In a highly preferred form, the liquid injector includes provisions for injecting two fluid streams into a suspension of fluidized solids at two discrete locations.
摘要:
A method and apparatus for generating and dispersing immiscible liquid particles in a carrier liquid by introducing the immiscible liquid as streams into a tubular flow of carrier liquid and shearing particles from the streams immediately as they enter the flow path with shearing elements rotating through the tubular flow path closely adjacent the ends of the tubes. The flow of the particle-containing liquid is stabilized by vanes extending parallel to the tubular flow path and the flow is disrupted to disturb any uneven concentration of particles by an offset portion of the flow conduit, which offset portion is rotated. The flow is distributed into dispensing conduits mounted on a support that is reciprocated to impart a primary reciprocal motion and a secondary reciprocal motion to the dispensing of the particle-containing carrier liquid for application to a substrate, such as carpet. The reciprocal motions are provided by an orbiting shaft having a sprocket fixed thereon and one end of a link connected thereto with the other end of the link connected to an eccentric shaft on the support to impart primary reciprocal motion and a sprocket carried on the eccentric shaft connected by a chain to the sprocket on the orbiting shaft imparts a lesser secondary reciprocal motion through the eccentric shaft to the support.
摘要:
A dispersion of polymeric particles in a non-aqueous liquid is mixed with water with sufficient agitation to initiate substantial dissolution of the particles into water and is substantially homogeneously dispersed into the water substantially immediately, for instance in less than 50 milliseconds from the initiation of substantial dissolution. Preferred apparatus is an orifice mixer having a mixing chamber 41 leading to an orifice 51 and supplied by an inlet 46 for dispersion, the inlet terminating in a valve 47 and an orifice 44, and an inlet 45 for water. The effective outlet area of the orifice 51 is adjusted by an eccentrically mounted aperture plate 52 and there is a shear helix 57.
摘要:
Disclosed is a method and apparatus for manipulating fluids. The apparatus may include a microfluidic structure including inlet channels (1 and 2) and outlet channels (306, 307, 308, 309, 310, 311, 312, 313, and 314) oriented among bifurcated (5), trifurcated (6) and merging junctions (7 and 8). The apparatus splits and merges fluids flowing in the channels to produce successive dilutions of the fluids within the outlet channels. Multiple apparatus may be combined in serial, parallel, combined serial and parallel and/or stacked configurations. One or more apparatus may be used alone or to provide various devices or chambers with the diluted fluids.
摘要:
A high-pressure homogenizer, comprising: a plurality of pumping pistons (2a, 2b), for feeding a liquid to be homogenized toward a manifold (6), each piston being associated with a respective oil hydraulic cylinder; a homogenizing valve positioned downstream of said pumping pistons (2a, 2b); and an electronic system (5) for controlling and regulating said pumping pistons (2a, 2b), which controls the law of motion of each individual piston (2a, 2b) independently. Said electronic regulation system (5) is connected to a transducer placed on the manifold (6) to regulate the delivery of oil to the individual cylinders (3a, 3b) according to the pressure, sensed in the manifold (6), of the liquid to be homogenized pumped by said pistons (2a, 2b) in order to maintain a stable flow rate and pressure.
摘要:
There is provided a mixing device (2) for a beverage and CO2 gas for producing carbonated beverage. The mixing device (2) having a mixing channel (4) extending in a main direction (10). The mixing channel (4) includes: wide channel sections (16) and narrow channel sections (18) along the main direction (10). The mixing channel (4) has an elongated cross section seen in a direction perpendicular to the main direction (10). At least a first delimiting surface (22) of the mixing channel (4) is provided with protrusions (20) extending at least partially along the first delimiting surface (22) in a direction across the mixing channel (4) and protruding towards a second delimiting surface (24) of the mixing channel (4) to form the narrow channel sections (18). A turbulent flow of beverage is created by the narrow and wide channel sections. Further a carbonator for producing carbonated beverage, an appliance having a carbonator, and a method of producing a carbonated beverage are provided.