100 results about "Mechanics of fluids" patented technology

The described method and apparatus pertains namely to the HVAC (Heating, Ventilating, and Air Conditioning) industry, though its many functions extend into any and all forms of air-fluid movement, metering, distribution, and containment. Essentially, the scope of operation of the method and apparatus encompasses all forms of scientific and engineering measurement dealing with fluid dynamics, fluid statics, fluid mechanics, thermal dynamics, and mechanical engineering as they pertain to precise, articulated control of air-fluid distribution and delivery. The described method and apparatus offers complete, comprehensive, and correct utilization of air-fluid movers and terminal devices under unique sensor logic control, from initial lab testing stages through to equipment cataloguing, selection, design and construction of any and all air-fluid distribution systems in entirety, whereas previously there was no such cohesive, total and terminal method of control for these systems or their components.

The invention belongs to the field of early-stage non-invasive diagnosis and relates to a measurement method of a virtual hepatic vein pressure gradient. The measurement method of the virtual hepatic vein pressure gradient comprises the following steps: carrying out three-dimensional modeling on a hepatic vein-portal vein system; dividing a mathematical model by a finite element mesh; and calculating the virtual hepatic vein pressure gradient (vHVPG) by fluid mechanical emulation. The three-dimensional modeling of the vein-portal vein system, the finite element mesh division and the fluid mechanical emulation calculation are optimized and completed, and a vHVPG detection novel technology with better diagnosis advantages is constructed and identified; and a non-invasive manner which is safe and novel and can accurately measure is provided for the early-stage non-invasive diagnosis of patients with portal hypertension.

Fluid Mechanics of Inertia incorporates all the variables of flight mechanics, interplanetary ballistics, perpetual motion, human powered transportation, and all aspects of fluid mechanics involving matter, energy, and motion, and includes elastic fluids into the definition of “fluids”. The “Mechanics” in Fluid Mechanics, may mistakenly be construed to be dynamics. Fluid Mechanics of Inertia is simplified calculus and converts calculus to trigonometry, logarithms, geometry, algebra, and basic functions. Fluid Mechanics of Inertia is a three dimensional math occurring in a time frame of no elapsed time although the locomotive animation of life is at full locomotive performance, the “snap-shot” elapsed time is zero, except where elapsed time is derived to elapse a time interval of a prescribed time allowance duration which is described, and there is no motion, thus “dynamics” does not occur in these problems since time is zero.

The invention belongs to the hydro-mechanical field, especially refers to an apparatus determining the rheological properties of the hgh-temperature Newton viscous melt, composed of transformer, computer control system, cooling water system, control box, measuring rod, graphite protection tube, molybdenum measuring head, graphite crucible, tungsten-rhenium thermocouple, high-temperature resistance furnace, argon-gas pot, sensor and electric motor and its character lying in that it adds variable-frequency speed governing power supply, multiturn potentiometer, digital speed meter, stabilized voltage supply and speed meter's control box. It can determine viscous fluid as well as time-correlative fluid. It can describe the relation of cut rate (*) and cut stress (D).

The invention belongs to the hydro-mechanical field, especially refers to an apparatus determining the rheological properties of the hgh-temperature Newton viscous melt, composed of transformer, computer control system, cooling water system, control box, measuring rod, graphite protection tube, molybdenum measuring head, graphite crucible, tungsten-rhenium thermocouple, high-temperature resistance furnace, argon-gas pot, sensor and electric motor and its character lying in that it adds variable-frequency speed governing power supply, multiturn potentiometer, digital speed meter, stabilized voltage supply and speed meter's control box. It can determine viscous fluid as well as time-correlative fluid. It can describe the relation of cut rate (*) and cut stress (D).

The invention provides a method for establishing a blood flow calculation model for evaluating a coronary arterial blood flow situation. The method comprises the steps of: establishing a three-dimensional model of a heart, wherein the establishment is implemented by scanning to obtain CT imaging two-dimensional grayscale images of the heart by utilizing CT equipment, performing binarization processing on the CT imaging two-dimensional grayscale images of the heart, stacking the images according to a preset relation, and acquiring a coronary artery three-dimensional structure after stacking; establishing a hydrodynamic model of blood, wherein the establishment is implemented by adopting a self-adaptive local encryption technology to perform discrete gridding on a three-dimensional heart model structure to generate self-adaptive refined grids, and establishing a lattice Boltzmann method (LBM) blood flow calculation model based on the self-adaptive refined grids; and calculating a fractional flow reserve (FFR). The fluid calculation model established in the invention has the advantages of high calculation precision and high efficiency, so that the calculated fractional flow reserve has high precision, the calculation time is short, the precision of evaluating the coronary arterial blood flow situation is higher, and the efficiency is higher.

The invention relates to a multi-functional fluid mechanics experimental apparatus. The multi-functional fluid mechanics experimental apparatus includes a water tank connected with a water incoming pipe with an electromagnetic valve, a controller and a touch screen; a side wall of the water tank is provided with two pressure transmitters with different heights; the bottom of the water tank is connected with a first water suction pump and a second water suction pump respectively through pipelines; the first water suction pump is connected with a first horizontal pipe with an electromagnetic valve through a pipeline; the first horizontal pipe is connected with a second horizontal pipe at a lower position through a vertical pipe; the first horizontal pipe and the second horizontal pipe are both provided with a flow meter and a pressure transmitter; the second water suction pump is connected with a horizontal Renault pipe through a pipeline with an electromagnetic valve and a flow meter; the inlet end of the Renault pipe is connected with an ink box at a higher position through a pipeline with an electromagnetic valve; the first water suction pump, the second water suction pump, all the electromagnetic valves, the pressure transmitters and the flow meters are respectively connected with the controller; and the controller is connected with the touch screen. With the multi-functional fluid mechanics experimental apparatus adopted, a plurality of fluid mechanics experiments can be completed. The multi-functional fluid mechanics experimental apparatus has the advantages of high measuring precision, fully-automatic operation and high experiment efficiency.

A method is provided for determining the flow of a fluid in a volume of interest, including steps of remotely measuring, at a plurality of measurement points distributed along at least three axes of measurement having different spatial orientations passing through the volume of interest, the radial velocity of the fluid in the vicinity of the measurement points, and for calculating the velocity of the fluid at a plurality of calculation points distributed in a grid in the volume of interest, wherein the calculation of the velocity of the fluid includes the use of a mechanical behavior model of the fluid. A device is disclosed for implementing the method.

The invention relates to a sensor and preparation for sewage flux detection. It is used for the water flux auto-detection, control and management in the city environment protection, mine, metallurgy, constructing material, electric power and chemical industry. The device is made up of the open-channel flux slot and the board intelligent sensor. The open-channel flux slot is designed according to the open-channel hydrodynamics Bernoulli's theory. The board intelligent sensor is divided into two parts: one part is signal detection part; the other is intelligent data processing part and the wireless data transforming part. The detection signal is not been influence by the temperature and pressure. The detection error is small and stable, reliable. It is not adhered by the mud and sewage. It is convenience to be installed, used and maintained. It is proper for the flux meter of the wild open-channel and the cloacae out.

The invention discloses a fluid-solid coupling calculation model of an elastic ring type squeeze film damper, which adopts a Reynolds equation as an oil film control differential equation of an oil film, so that a three-dimensional fluid mechanics model of the oil film is simplified into a two-dimensional model, the number of degrees of freedom of the ERSFD fluid-solid coupling model is reduced, the calculation scale is compressed, and the calculation time can be remarkably saved. The structural deformation of the elastic ring is described by adopting a deflection curve differential equation of a beam, a three-dimensional structural mechanical model is simplified into a one-dimensional model, and the boundary condition of the elastic ring section is set to be a simple support type according to the working state of the elastic ring, so that the contact iteration process between a boss and a bearing seat and between the boss and a bearing outer ring is omitted, and a basis is provided for further improving the calculation efficiency.

The invention relates to the technical field of hydromechanics model tests, and provides a particle picture speed measuring technique which is efficient, reliable and strict and synchronous in measurement of different sections. According to a lamination synchronous three-dimensional particle picture speed measuring method, incident multi-color lasers are dispersed to light sources of different colors by a triple prism light splitting device, and meanwhile the light sources illuminate to a testing area; an illuminated particle picture presents different color characteristics in different sections; a set of charge coupled device (CCD) video cameras are arranged near the testing area, an optical filter in a certain color is added to the front of a lens of each video camera, the colors of the optical filters are matched with those of the light sources, so that the video camera can only shoot the section with the corresponding color; and all the video cameras work simultaneously, particle pictures on different sections are obtained simultaneously, two-dimensional particle picture analysis is conducted on each section, relative analysis is conducted on pictures among different sections, and three-dimensional flow field information is obtained. The method is mainly applied to testing and measuring of hydromechanics models.