204 results about "Flow resistivity" patented technology

Novel porous PTFE membranes are described possessing a unique combination of high strength, low flow resistance, and small pore size. Additionally, unique constructions with superior filtration and venting properties incorporating porous PTFE membranes are described.

An out flow resistance switching ventilator and its methodology for providing mechanical ventilation support to the respiratory failure patient are claimed. Based on the continuous out flow impounding ventilation mechanism, the apparatus provides ventilation by switching flow resistance between two different levels at a continuous gas flow system outlet valve controlled by patient's spontaneous breathing or preset mandatory parameters, resulting in airway pressure levels switching, and therefore creating lung volume switching, which is totally different from either volume ventilation or pressure ventilation mechanism utilized in the current conventional ventilators.

Filter media, including those suitable for hydraulic applications, and related components, systems, and methods associated therewith are provided. The filter media described herein may include two or more layers, at least one of the layers having a relatively high percentage of microglass fibers. Additionally, the filter media may be designed such that the ratio of average fiber diameters between two layers is relatively small, which can lead to a relatively low resistance ratio between the layers. The filter media has desirable properties including high dirt holding capacity with low basis weight and a low resistance to fluid flow. The media may be incorporated into a variety of filter element products including hydraulic filters.

A thermo-formed acoustic product formed from an acoustic sheet with a relatively high flow resistance, and a layer of porous flow resistive spacer material attached to one side of the acoustic sheet and having a flow resistance substantially smaller than the acoustic sheet. The acoustic product has locally reactive acoustic behavior and an overall air flow resistance of between 2800 Rayls and 8000 Rayls. A decorative facing can be applied to the acoustic sheet.

The invention discloses a high-flow-conductivity acid fracturing method for carbonate rock reservoirs, and belongs to the field of reservoir reconstruction technologies. The high-flow-conductivity acid fracturing method includes applying acid fracturing processes for corroding crack by acid fluid and hydraulic fracturing processes for filling the crack with added sand in a combined manner, to be more specific, forming the crack in the carbonate rock reservoirs by the aid of non-reactive ahead fluid and reducing the surrounding temperatures of wall surfaces of the crack; injecting high-concentration acid fluid systems to corrode the wall surfaces of the artificial crack and forming uneven grooves in the wall surfaces of the crack by means of corroding to allow the crack to have certain flow-conductivity after the crack is closed; enabling high-viscosity sand-carrying fluid to carry proppants and flow into crack systems and filling the crack with the high-viscosity sand-carrying fluid to further improve the flow-conductivity of the crack. The high-flow-conductivity acid fracturing method has the advantages that the high-flow-conductivity acid fracturing method is reasonable in design, simple in process and convenient to implement in fields, the high-flow-conductivity crack systems with the acid-corroded crack and crack closing supporting functions can be formed, oil and gas flow resistance can be reduced, the acid fracturing reconstruction effects can be improved for the carbonate rock reservoirs, and the high-flow-conductivity acid fracturing method can be widely used for acid fracturing reconstruction construction for limestone, dolomite and carbonate rock oil and gas reservoirs with mud.

An apparatus for controlling fluid flow into a tubular includes an in-flow control device having a plurality of flow paths; and a reactive media disposed in each of the flow paths. The reactive media may change permeability by interacting with a selected fluid such as water. Two or more of the flow paths may be hydraulically parallel. The reactive media may include a Relative Permeability Modifier. An associated method may include conveying the fluid via a plurality of flow paths; and controlling a resistance to flow in plurality of flow paths using a reactive media disposed in each of the flow paths. An associated system may include a wellbore tubular; an in-flow control device; a hydraulic circuit formed in the in-flow control device; and a reactive media disposed in the hydraulic circuit, the reactive media may change permeability by interacting with a selected fluid.

An apparatus comprising a substrate having a surface configured to accommodate a fluid thereover. A plurality of fluid-support-structures are on the surface. Each of the fluid-support-structures has at least one dimension of less than one millimeter. A well in the substrate has an opening on the surface. A medium is locatable between the plurality of fluid-support-structures and in the well. The medium located between the fluid-support-structures is in communication with the medium in the well.

A method (50) for making a heat pipe (10) includes the following steps: a) providing a screen mesh (30) in the form of a multi-portion structure with at least one portion having an average pore size different from that of the other portions; b) rolling the screen mesh into a hollow column form; c) inserting the screen mesh into a hollow pipe body (22) of the heat pipe; d) sintering the screen mesh received therein at a predetermined temperature; and e) filling a working fluid into the pipe body and sealing the pipe body. The portion with large-sized pores is capable of reducing the flow resistance to a condensed fluid to flow back, whereas the portion with small-size pores is capable of providing a relatively large capillary pressure for drawing the condensed fluid from the condensing section to the evaporating section of the heat pipe.

A bipolar plate assembly is provided for use in a fuel cell stack to supply reactants to the anode and cathode sides of fuel cells within the stack. The bipolar plate assembly includes first and second sub-plates, each including a first face surface having a coolant flow field formed therein and a second face surface having a reactant flow field formed therein. The coolant fields of the first and second sub-plates include regions of varying flow volume, having respective flow resistance therebetween. The regions of varying flow volume enable variable cooling across the fuel cell stack, thereby enabling a constant temperature to be achieved across the fuel cell stack.

The invention provides a flow meter of a perforated plate, which comprises the perforated plate and the flow meter. A substrate of the perforated plate is in a circular shape. The perforation rate f the perforated plate ranges from 10% to 60%. The substrate has three categories with uneven hole structures. A large circular hole is arranged at the centre position of a preferential substrate, a plurality of small circular holes are evenly distributed on the other positions of the substrate, the small circular holes arranged on the outmost periphery intersect with the periphery of the substrate to form non-complete circular holes. The diameter of the large circular hole is two to ten times of the diameter of the small circular holes. The flower meter can be chosen from three categories: 1 a direct-reading type pipe chute differential-pressure flow meter, 2 an indirect reading flow meter connected with a secondary meter through a differential-pressure sensor and 3 an indirect reading flowmeter connected with a secondary meter through a differential-pressure switch and a differential-pressure sensor. The flow meter is small in volume, convenient to install, high in measurement accuracy, small in flow resistance of fluid, less in liquid accumulation in a pipeline and especially suitable for measuring flow of vapor, combustible fluid, explosive fluid, corruptible fluid and dirty fluid.

A method for optimizing oil production rate from an oil well with high gas-to-oil ratio is disclosed to include modeling an Inflow Performance Relationship curve and calculating an optimal level of bottomhole pressure to be higher than zero. Maintaining the bottomhole pressure at that calculated optimum level by using a bottomhole tool of the invention or other known means such as gas injection provides for maximum oil recovery from a given well. The bottomhole tool includes a multi-stage flow resistor and a needle moved in and out of the resistor by a spring-biased piston responsive to a difference in pressure between a bottomhole pressure and a pipe pressure. Automatic adjustment of the bottomhole pressure is maintained over a wide range of operating parameters throughout the life of the well.

The invention provides for a quasi-linear tube Coriolis mass flowmeter (CMF), which is used for direct high-accuracy measure for mass flow and comprises two quasi-linear tube measuring tubes with the same structure in parallel, a vibration exciter, two detectors, four distance plates, two flanges, two end connecting tubes, two shunts and four matching blocks. The quasi-linear tube Coriolis mass flowmeter (CMF) can effectively improve the properties and quality factors of a resonance sensor, greatly reduces volume of a flowmeter, lowers flow field influence, and has small flow resistance, low pressure loss and simple installation and processing; the measuring tube has favorable dynamic equilibrium, can measure the liquid mass flow with high viscosity and high impurity content, further expands the application range of the CMF and satisfies the industrial development requirements on accuracy and range of flow measurement; and the invention plays a greater role in saving raw materials, lowering production cost, reducing environment pollution, improving profit margin and promoting product quality.

The invention discloses a condenser which is composed of a porous micro through heat exchange flat tube, a corresponding connecting header and a heat dissipation back plate arranged at one side of the heat exchange flat tube. In the invention, the structure is compact, the heat exchange efficiency is high, the aluminum flat tube is adopted, thus the condenser is more advantageous than the existing copper heat exchange tube in the aspect of economical efficiency, and the condenser is suitable for the fields such as refrigeration, chemical engineering, energy source, heat exchange and the like. The condenser is characterized in that on the one hand, since the porous micro channel flat tube structure is adopted, the coefficient of heat transfer in the tube is improved, and simultaneously the flow resistance of a refrigerant in the tube is reduced; and on the other hand, the contact type of the condenser and the side wall of the heat dissipation back plate is surface contact, so that contact thermal resistance is reduced, the average temperature of the side wall of the heat dissipation back plate is improved, and the heat exchange between the side wall of the back plate and the ambient air is strengthened, namely the condensing effect is strengthened, thus, when the lengths of pipes are the same, the quantity of the condenser can be increased, or when the heat exchange quantities are the same, the length of the pipes can be reduced, therefore the condenser is more compact, simultaneously the material consumption is reduced, and the condenser has a certain advantage in the aspect of economical efficiency.

An airborne sound-absorbing engine compartment lining for motor vehicles comprises an open-cell, air-permeable foam material layer made from plastic and having a front side and a rear side. The foam material layer is provided on its rear side with a fiber layer made from mineral fibers, the foam material layer having a thickness of less than 6 mm and a specific flow resistivity in the range from about 100 to 1,200 Ns/m³. The fiber layer has a thickness of more than 6 mm and a mass per unit area of less than 800 g/m².

A mixing assembly includes an inlet, an outlet and a mixing chamber, the inlet is fluidly connected to the outlet through a plurality of micro fluid flow paths in a direction perpendicular from the inlet. The micro fluid flow paths fluidly connect to the perpendicular inlet via a curved transition portion. The curved transition portion provides a more efficient flow path for the fluid to travel from the inlet to the micro fluid flow paths to the mixing chamber. By transitioning the direction change, flow resistance is decreased, and the fluid flow rate and shear rate is increased. Increased fluid flow rate and shear rate helps to increase consistency and quality of mixing, and to reduce particle size of the fluid in the mixing chamber.

The invention discloses an in-built middle through-hole dynamic throttling element flow meter, belonging to the technical field of automatic detection of a throttling flow meter. The flow meter is characterized in that an in-built middle through-hole dynamic throttling element is adopted; the internal and external pressures of the dynamic throttling element are balanced; the measured fluid pressure is born by a flow meter pressure hull, thus, a thin wall thick dynamic throttling element can be used; the main boy of an anti-blocking mechanism is a flexible filter medium or a filter membrane with a simple structure; compared with the used pore plates of a differential pressure flow meter, the flow meter provided by the invention mainly uses a dynamic venturi tube; the venturi tube has the advantages of small flowing resistance loss, long service life, high precision, and the tube is hard to block and the like. The flow meter provided by the invention is simple in structure, easiness in manufacturing, high in performance cost ratio, less in energy consumption for measurement, thus, the flow meter can be used for measuring the flow of small pipe diameter and dirty fluid, and has a development prospect for replacing differential pressure flow meters and partial small pipe diameter ultrasonic flow meters.

The invention relates to a flow resistance and temperature distribution testing device for low-temperature fluid inside heat insulating corrugated pipes. The low resistance and temperature distribution testing device for the low-temperature fluid inside the heat insulating corrugated pipes comprises a low-temperature self-pressurization storage tank, a two-stage supercooler, a corrugated pipe testing section, a vaporizer and a gas flowmeter which are connected through metal hoses. The corrugate pipe testing section is communicated with an inflating and exhaust pipe, which adjusts the internal vacuum degree of the corrugated pipe testing section; the inside of the corrugated pipe testing section is provided with a temperature and pressure measuring unit and a vacuum degree measuring unit, and the flow resistance and the temperature distribution of the low-temperature fluid inside the heat insulating corrugated pipe can be obtained according to the temperature, pressure and vacuum degree data inside the heat insulating corrugated pipes. Compared with the prior art, the flow resistance and temperature distribution testing device for the low-temperature fluid inside the heat insulating corrugated pipes is simple in structure, convenient to operate, safe, reliable and applicable to experiment measurement of the flowing and heat transfer characteristics of the low-temperature fluid inside the heat insulating corrugated pipes at different inclinations.