33 results about "Hydrodynamic resistance" patented technology

Articles and methods for controlling flow in fluidic Systems, especially in microfluidic Systems, are provided. A microfluidic System includes a configuration such that the actuation of a single valve can allow the switching of fluids from a first fluid path (e.g., a first channel section) to a second fluid path (e.g., a second channel section). This may be achieved by incorporating a valve (38) with a first channel section (24), which may have a lower hydrodynamic resistance than a second channel section (28) prior to actuation of the valve. Actuation of the valve (38) can cause only the hydrodynamic resistance of the first channel section (24) to increase, thereby redirecting fluid flow into the second channel section (28) (which now has a relatively lower hydrodynamic resistance). The valve comprises a control channel (40) for introducing a positive or reduced pressure, and is adapted to modulate fluid flow in an adjacent channel section by constricting or expanding the channel section (24).

A method for controlling the movement of a marine vessel comprises steps that rotate two marine propulsion devices about their respective axes in order to increase the hydrodynamic resistance of the marine propulsion devices as they move through the water with the marine vessel. This increased resistance exerts a braking thrust on the marine vessel. Various techniques and procedures can be used to determine the absolute magnitudes of the angular magnitudes by which the marine propulsion devices are rotated.

The invention concerns the production of filter materials for the purification and disinfection of water, water solutions and other liquids, as well as for sterilizing filtration of injections and other solutions, for concentration of biomolecules in physiological liquids, concentration and extraction of viruses, preparation of apyrogenic water, in biocatalytic diaphragm reactors. The invention solves the problems of a new filter material production, characterized by high sorption properties, high retention efficiency of submicron electronegative particles, microorganisms, submicron non-polar particles and chemical contaminations, and, at the same time, characterized by low hydrodynamic resistance. A base of filter material is the nonwoven organic synthetic polymeric fabric, modified by the aluminum hydroxide particles, fixed to the surface of base fibers for improvement of its sorption properties and for making it positively charged. A method of filter material production comprises: applying the modifying composition onto the fibrous base in the form of organic nonwoven synthetic polymeric fabric, wherein said modifying composition comprises the particles of the aluminum-based material, hydrolysis thereof results to formation and fixation of the aluminum hydroxide particles to the base fibers. A method of fluid filtration is carried out using the filter material as a non-woven organic synthetic polymeric fabric, to the fibers of which the aluminum hydroxide particles are fixed.

The present invention includes a microfluidic device comprising one or more parking loops 12, each parking loop 12 comprising a bypass channel 14 and a lower branch 16 capable of retaining one or more drops, wherein bypass channel 14 has a smaller hydrodynamic resistance than the lower branch 16.

A vane type hydraulic actuator, wherein a chip seal 1, as a seal element between the case 43 and the rotor 44, can be pressed to contact tightly with the counter surface, without using a spring 47 as in the prior art, when a working oil is supplied either from the oil pressure chambers for timing retard or for timing advance. Simultaneously, the locking between the rotor 44 and the case 43 can be released. The hydrodynamic resistance at the gap between the tip of the seal element (chip seal) 1 and the counter surface of the seal element is made larger than that at the gap between the flank of the seal element 1 and the flank of the seal groove 2, which accomodates the seal element, so that the working oil of the hydraulic actuator flows between the flanks. The working oil at the bottom of the seal element urges the seal element to contact tightly with the counter surface. An oil channel 6 connects the bottom of the seal groove and a stopper pin holding hole 4, which holds a stopper pin 3 pressed by a spring 5. When a working oil is supplied from either of oil pressure chambers for timing retard or advance, the channel 6 opens to supply a working oil into the stopper pin holding hole 5 so as to displace the pin against the biasing force of the spring 5 to release the suppression of rotation.

A centrifugal microfluidic device is provided having a microfluidic circuit, a fluid reservoir for providing fluid in the microfluidic circuit, a hydrodynamic resistance element in fluid communication with the reservoir for controlling rate of flow of a fluid out of the reservoir, and a siphoned chamber in fluid communication with the hydrodynamic resistance element and the microfluidic circuit for receiving fluid from the hydrodynamic resistance element and for delaying and metering of the fluid into the microfluidic circuit. The microfluidic device is useful for performing a biological assay. Operation of the device is completely independent on the liquid-solid contact angle and wetting properties of the liquids on the solid material of the platform, and the device does not need a carefully controlled rotation protocol.

The floating breakwater includes various different embodiments, as can have an anchored or moored float. The float is desirably in the geometric form of a generally rectangular solid configuration, but can include other forms. One or more baffles or skirt walls extend from the bottom surface of the float, thereby attenuating subsurface wave action to a greater depth than the bottom of the float. Each of the baffles or skirt walls desirably includes a thin, flat, monolithic plate member for enhancing hydrodynamic resistance. The one or more baffles or skirt walls can be continuous and unbroken, or can have a plurality of apertures therethrough. When three or more baffles or skirt walls are provided they can be evenly spaced, or the spacing therebetween can vary. When two or more baffles or skirt walls are provided they can have equal depths, or their depths can differ from one another.

The invention discloses a solving method of the takeoff performance of a ground effect vehicle. The takeoff performance comprises takeoff water-leaving speed, water-leaving time and water skiing distance. The method comprises the steps of carefully analyzing a relationship between hydrodynamic resistance/thrust/ angle of trimming in full-aircraft powered pool model test data and speed, a relationship between the hydrodynamic resistance/thrust/ angle of trimming and the center of gravity, and the relationship between the hydrodynamic resistance/thrust/ angle of trimming and weight; finding feature points; carrying put segmentation fitting on the hydrodynamic resistance, the thrust and the angle of trimming to obtain the relational expressions of the hydrodynamic resistance, the thrust and the angle of trimming; obtaining the relational expression of the hydrodynamic resistance and the speed by combining with a CFD (Computational Fluid Dynamics) computation result or a wind tunnel test result; and quickly and effectively calculating the takeoff performance of the ground effect vehicle in different states according to an equation of motion of the ground effect vehicle. The invention provides a computation method suitable for the takeoff performance of the ground effect vehicle and provides a good condition for the total performance computation of the ground effect vehicle.

The invention relates to a method and system for generating droplets of an aqueous solution on a microfluidic chip with an air continuous phase. Specifically, the droplet generator according to the present invention is integrated into a microfluidic chip to generate and introduce droplets of an aqueous solution into the microfluidic chip. The droplets travelling in a network of chip channels may be captured in on-chip traps in a manner defined by hydrodynamic resistances of chip channels. A biological reaction may be performed on a droplet trapped on the microfluidic chip.

In order to be able to stably manufacture a fluid resistance device having the same resistance characteristics while preventing fluid such as gas from leaking, a fluid resistance device is provided with a fluid resistance element having a resistance flow passage, a base member and a fixing member for holding the fluid resistance element to be fixed between the base member and the fixing member, and a thin plate-shaped seal member interposed between the fixing member and the fluid resistance element.

The pipeline leak detector travels through a pipeline passively due to the flow of liquid through the pipeline. The device includes leading and trailing rings shaped to produce hydrodynamic resistance in order for the device to be carried through the pipeline. Wheels are provided about each ring. At least one wheel has an odometer to measure distance traveled through the pipe. The rings are joined by a plurality of axially oriented connecting rods. A plurality of sensing elements extend between the rings. Each sensing element has a thin laminate of a piezoelectric film sandwiched between two electrically conductive layers, and an electrically insulating coating on the outside of each conductive layer. One of the rings, e.g., the trailing ring, includes microelectronic circuitry for data acquisition and storage, e.g., estimates of the magnitude of any leakage encountered, the location of the leakage based upon the odometer travel, etc.

This invention relates to a design of a ship hull, and more particularly, to cargo ship or submarine configurations featuring flow channels on the hull surfaces, and multihull structure, and improved diving and surfacing properties, and reduced hydrodynamic resistance, and improved hull damage resistance, and further comprising underwater hub cargo loading and unloading, and relates to manned or unmanned or semi-autonomous sea vessels. A hull design consists of a curvative hull form transversally and symmetrical about its center line CL and design water line, and consists of ballast and storage tanks and cargo compartment within the hull portions and operable to adjust the draft and the depth of the vessel according to the loaded weight, and provides detachable installation options. The invention relates to a ship hull design with reduced block coefficient (Cb) values.

The present invention relates to a microfluidic particle analysis device comprising an inlet in fluid communication via a main channel defining a main flow direction with an inlet manifold providing parallel fluid communication with

• • a bypass channel of hydrodynamic resistance R_bypass, and
  • a measuring channel of hydrodynamic resistance R_measuring, the measuring channel having a cross-sectional dimension in the range of from 1 μm to 50 μm and further having a sensor system for detecting a particle,
  • wherein a flow distribution parameter X_measuring=R_measuring⁻¹(R_measuring⁻¹+R_bypass⁻¹)⁻¹ is in the range from 10⁻⁶ to 0.25, wherein the angle of the measuring channel relative to the main flow direction is in the range of 0° to 60°, and wherein the angle of the bypass channel relative to the main flow direction is in the range of 0° to 60°, and
  • the microfluidic particle analysis device further comprising an outlet in fluid communication with the bypass channel and the measuring channel. The present invention relates to a method of using the device microfluidic particle analysis.

The invention relates to a numerical simulation method of hydrodynamic resistance torque when in opening and closing of a straight gate of a navigation lock, belonging to the technical field of navigation lock hydraulics. Based on an FLUENT fluid computation platform, the opening and closing dynamic process of the straight gate is controlled by virtue of a User-Defined Function (UDF), and numerical simulation of the hydrodynamic resistance torque in the opening and closing dynamic process of the straight gate is realized through establishing a three-dimensional mathematical model of the straight gate of the navigation lock, a gate chamber region and a lock chamber. The numerical simulation method proposed by the invention has the advantages that the accuracy is good, the possibility of fast and conveniently acquiring the hydrodynamic resistance torque when in opening and closing of the straight gate of the navigation lock can be provided, the numerical simulation method can be applied to determination of the hydrodynamic resistance torque of the straight gate of the navigation lock, determination of opening and closing force, design of capacity of a hoist, optimization of boundary conditions of a gate chamber, and the like, and the problems existing in test and study means of a physical model of time and energy waste, and the like can be solved.

The underwater vehicle with variable configuration (1) comprises: a hull (2) consisting of at least four elongated elements (20), mutually articulated by means of joints (21), to form a first closed polygonal structure (F1), arranged on a plane; thrusters (3), associated in parallel with said elements (20) of the hull (2); actuating means (22), associated with said joints (21), provided for automatically modifying said first closed polygonal structure (F1), from an elongated shape configuration (AF1) to an expanded shape (EF1), corresponding to an elongated conformation of said hull (2), to determine a low hydrodynamic resistance and a longitudinal thrust of the thrusters (3) in the cruising of said underwater vehicle (1), and to a substantially isotropic conformation, wherein the same elements (20) of the hull (2), as well as the thrusters (3) are mutually angled, intended for the hovering of the same underwater vehicle (1), respectively. The latter can be suitably equipped with robotic arms (4) intended for performing maintenance or similar interventions in underwater locations.

A method for calculating the takeoff performance of a ground effect vehicle relates to the technical field of vehicle overall design. The method mainly comprises the following steps: (1) carrying outa full-vehicle powered pool test of the vehicle, and measuring the hydrodynamic resistance, thrust, pitch angle and velocity of the vehicle; (2), calculating the hydrodynamic drag, thrust, pitch angleand velocity of the real ground effect vehicle (GEM); (3), calculating the lift coefficient and the drag coefficient according to the pitch angle, and calculating the aerodynamic drag; (4), calculating the takeoff and departure speed of the vehicle; (5), obtaining the motion equation of the vehicle during takeoff water skiing. The invention solves the shortcomings of complex calculation of takeoff performance of conventional ground effect vehicle and inaccurate calculation result, and provides conditions for overall performance analysis of ground effect vehicle.