104 results about "Viscous flow" patented technology

The invention discloses a modularized replaceable self-resetting energy consumption type bridge pier anti-collision system, and belongs to the technical field of bridge engineering structure safety. The system includes an annular rubber pad, an annularly disposed damper module, and a shape memory alloy (SMA) tow. The damper module comprises a cylinder body, high-viscosity fluid, a reset spring, a piston and a force transmission plate. The cylinder body is fixed to the pier in a surrounding mode through bolts and rubber pads, the inner wall of the cylinder body is connected with the piston through a reset spring, the piston rod end is hinged to the force transmission plates, and the SMA wire bundles are connected with the force transmission plates. When an external impact load acts on the force transmission plate, the fluid damper provides viscous energy consumption, and the SMA wire bundle, the spring and the rubber pad provide deformation energy consumption; after the collision is finished, the system can be reset to the initial position under the synergistic effect of the SMA wire bundle, the spring and the rubber pad. By means of the modular design, efficient energy consumption and self-resetting can be achieved; and meanwhile, a single damper can be quickly replaced after being damaged, so that the maintenance efficiency and the system recoverability are greatly improved.

The invention discloses a ship viscous flow numerical simulation method based on a hybrid Cartesian grid, and relates to the technical field of ship CFD. The method comprises the steps that after a computational domain is constructed, a body-fitted grid is generated at the object plane boundary of a ship model; then, on the basis of the outermost-layer body-fitted grid, a full-thread tree is used for carrying out space division on a computational domain to generate a Cartesian grid, and the full-thread tree is output as Cartesian grid topological information matched with the data structure of the target viscous flow solver; and finally, assembling and coupling the body-fitted grid and the Cartesian grid by using an overlapping grid technology to obtain a mixed partition grid unit, and applying the mixed partition grid unit to a solving process of a target viscous flow solver. Therefore, the accuracy and robustness of viscous flow numerical simulation of the ship with the complex geometry are improved, and the method can be well applied to resistance and flow field numerical simulation scenes in underwater and water surface ship body motion states.

The invention belongs to the technical field of ocean engineering, and particularly relates to a potential flow-viscous flow real-time coupling hydrodynamic analysis method and system for a floating body with a heaving plate. The method comprises the following steps of: 1, establishing a free surface potential flow model based on a three-dimensional potential flow theory, simulating wave-structure interaction, ignoring a viscous effect, converting a frequency domain result of a hydrodynamic load into a time domain load through a frequency-to-hour method, and taking the time domain load as an input for solving a motion state; 2, establishing an unbounded viscous flow CFD model, viscous force not covered by a potential flow model and an updated unbounded turbulent flow field around the heaving plate, and calculating the viscous force of the heaving plate; 3, establishing an unbounded potential flow model, and separating a force component repeated with the potential flow from a viscous flow result; 4, integrating the potential flow force and the viscous force to solve a floating body motion equation, iteratively updating the motion state and feeding back the motion state to the two solvers. The method is used for solving the problems that the efficiency is correspondingly reduced if the precision is improved and the precision cannot meet the requirement if the efficiency is improved in the prior art.

An electric submersible pump stage optimized for viscous fluid is provided. The stage can include a diffuser having a curved break water area. The stage can include an impeller having a cut back shroud and / or hub.

The invention relates to the technical field of material science and engineering, in particular to an amorphous alloy high-temperature rheological behavior prediction method, which comprises the following steps: acquiring multi-scale characteristic parameters of an amorphous alloy under a high-temperature condition, and constructing a viscoelastic constitutive model coupled with beta relaxation intensity and free volume evolution based on the multi-scale characteristic parameters; obtaining structure evolution data under different energy states, and correcting the viscoelastic constitutive model based on the structure evolution data; combining the corrected viscoelastic constitutive model with a machine learning algorithm, and generating a high-temperature rheological behavior prediction model through training; and based on the high-temperature rheological behavior prediction model, outputting a rheological stress value of the amorphous alloy under target temperature and stress conditions, and when the target temperature is higher than the glass transition temperature, introducing a viscous flow correction term into the viscoelastic constitutive model. According to the method, accurate and widely-applicable amorphous alloy high-temperature rheology prediction is realized by obtaining multi-scale parameters, constructing a coupling model, combining experimental correction and a neural network and verifying covered double-temperature zones.

The present disclosure generally relates to microfluidics, and to systems and methods for controlling the introduction of fluids. For example, certain aspects are generally directed to microfluidic devices having ports able to direct the end of a pipette tip into an end portion that is sized so as to allow fluid to flow from the pipette tip into an exit fluidly connected to a microfluidic channel. For example, the port may have a tapered portion that directs the pipette tip to the end portion. The end portion may be sized such that it is difficult for fluid to backflush around the pipette tip, and thus, the fluid is able to flow into microfluidic channels within the device, e.g., without resulting in excessive fluid remaining within the end portion. Other aspects are generally directed to methods of making or using such microfluidic devices, kits including such microfluidic devices, and the like.

This application relates to the field of sealing structure technology, specifically to a dynamic sealing structure for a servo motor system, a servo motor system, and an underwater vehicle. The dynamic sealing structure includes: a stern hull, a rudder shaft, a compensating plunger, a first sealing ring, and a viscous fluid medium. The stern hull has a mounting hole on its side wall for mounting the rudder shaft. The rudder shaft is disposed within the mounting hole, with its first end extending to the outside of the stern hull and its second end extending to the inside of the stern hull. The compensating plunger is slidably disposed between the mounting hole and the rudder shaft, and can slide along the axial direction of the rudder shaft, with one end of the compensating plunger contacting the outside of the stern hull. The first sealing ring is disposed between the outer periphery of the rudder shaft and the inner wall of the mounting hole, forming a sealing cavity with the stern hull, compensating plunger, rudder shaft, and first sealing ring. The viscous fluid medium fills the sealing cavity. Underwater vehicles incorporating this dynamic sealing structure have good sealing performance and can significantly reduce the risk of leakage.

The invention relates to a filling method and a filling line wherein a plurality of filling units, each one being suitable to contain the volume of fluid necessary to fill a respective container C, are recirculated in the filling line along a closed path P2, along a portion of which they are temporarily integral with respective containers C and fill them autonomously at a buffer station, in a longer time than that necessary for filling the same volume of fluid into said filling units which, therefore, can be filled at the normal production speed of the line at a filling station separate from the buffer station. Downstream of the buffer station, the emptied filling units are separated from the respective filled container C and are filled with a new volume of fluid, in order to autonomously transfer it to another, respective container C at the buffer station.

The application belongs to the field of polymer composite materials, and particularly relates to a preparation method of an ultrahigh molecular weight polyethylene / continuous fiber composite plate. The method comprises the following steps: (1) mixing ultrahigh molecular weight polyethylene, high-carbon straight-chain hydrocarbon and an antioxidant, and then mixing and extruding to obtain a viscous flow extrudate; the high-carbon straight-chain hydrocarbon is a normal alkane with 10-16 carbon atoms; (2) compounding the viscous flow extrudate with a continuous fiber fabric, and then performing hot extrusion to obtain a hot extruded product; and (3) sequentially performing hot soaking, cooling, cold extrusion and extraction treatment on the hot extruded product to obtain a composite plate. In the application, the high-carbon straight-chain hydrocarbon is used to dissolve the ultrahigh molecular weight polyethylene at high temperature, and then the high-carbon straight-chain hydrocarbon is removed through cold extrusion and extraction, so that the ultrahigh molecular weight polyethylene is hot extrusion compounded with the continuous fiber fabric to realize molding. In the whole molding process, no special and complicated equipment is needed, and the method is suitable for industrialized continuous production. Moreover, the obtained composite plate exhibits excellent mechanical properties.

An improved viscous flow non-reflection numerical value wave water tank relates to the technical field of computational fluid mechanics and comprises a computational domain, a flow field solving module, a liquid-liquid two-phase VOF module, a wave making module, a wave absorbing module, a solid-liquid boundary processing module and a data acquisition and analysis module, and the wave making module and the wave absorbing module are used for generating target waves to absorb emergent wave energy; the liquid-liquid two-phase VOF module realizes synchronous acquisition of an internal interface and a mixing ratio; the solid-liquid boundary processing module applies a complex / moving boundary condition on the fixed grid; the data acquisition and analysis module extracts information of a free surface and an internal interface, calculates characteristic quantities such as waves and mass transfer, feeds back indexes such as a reflection coefficient and a conservation error for damping and time step self-adaptive adjustment, realizes high-precision capturing of large deformation of the free surface, synchronously obtains mass transfer and flow information in liquid, and realizes high-precision capturing of large deformation of the free surface. And the influence of the reflected wave on the calculation precision is effectively suppressed.

The invention discloses a preparation method of high-temperature magnetic slurry for an inductor capable of being formed at low pressure, and relates to the technical field of electronic component materials. Magnetic powder is pretreated through a coupling agent, a uniform molecular layer can be formed on the surface of the magnetic powder, the acting force between the magnetic powder and organic molecules of a glue solution is improved, dispersity is enhanced, and eddy-current loss is reduced; the epoxy resin system with a specific ratio uniformly coats the magnetic powder by means of a high-speed rotation mode of a homogenizer, and can be converted into a viscous flow state after being heated, so that the magnetic powder has excellent warm-pressure fluidity, improves the magnetic density through pressing, can be matched with a curing agent to be rapidly cured, can be stably formed under the low pressure of 30-50 MPa, and avoids coil damage and magnetic core cracking; and the method is suitable for preparation of complex-structure composite inductors.

A fluid analysis system includes a fluid circuit and a foam generator positioned along the fluid circuit. The foam generator is configured to receive a gas and a viscous fluid to produce a fluid mixture. The fluid analysis system further includes a helical coil positioned along the fluid circuit downstream of the foam generator and configured to receive the fluid mixture. The fluid analysis system further includes one or more processors for determining a foam rheology of the fluid mixture after the fluid mixture flows through the helical coil.

The invention discloses a double-screw feeding and vacuum injection rubber hot-pressing forming machine which comprises a foot stool, a mold lifting unit is arranged on the foot stool and used for lifting a mold, a mold hoisting unit is arranged above the mold lifting unit and used for hoisting the mold, a double-screw feeding unit is arranged above the mold hoisting unit, and a vacuum injection unit is arranged above the double-screw feeding unit. When the double-screw feeding mechanism is used for producing, the main screw and the auxiliary screw of the double-screw feeding unit are meshed with each other to generate violent shearing, stretching and kneading effects, so that high-viscosity rubber compound is quickly homogenized and converted into a homogeneous viscous flow state, and the high-viscosity rubber compound is subjected to high-speed shearing, stretching and kneading. A self-cleaning effect is formed in a meshing area of the screw rods, and dead angles of accumulated materials are removed through dynamic mutual wiping between the screw rods; the self-adaptive gap design is formed through the sealing assembly between the upper mold hanging rod of the mold hanging unit and the vacuum cover, smooth sliding is achieved in the cold and hot temperature difference state, clamping is avoided, and the sealing performance of the vacuum cover in the vacuumizing process is not affected through the sealing effect of the sealing ring.

A viscous fluid feeder supplies viscous fluid used for printing. The viscous fluid feeder comprises a holder with an opening through which a cartridge containing the viscous fluid can be inserted and removed, a mounting receptacle onto which the cartridge is secured by pressing the cartridge horizontally from the opening to the rear, and a first air supply area located on the mounting receptacle such that the first air supply area is connected to the cartridge in a state where the cartridge is attached to the mounting receptacle and is configured to supply initial air to the cartridge to discharge the viscous fluid from the cartridge.

The invention relates to the technical field of composite material forming, in particular to a polyimide fiber composite material forming method and a mold. The die is composed of a common upper die, a lower die and an outer frame. The innovation point of the invention is that physical exhaust is carried out by using a natural gap of a mold parting surface in a critical stage when resin enters a viscous flow state through a specific programmed step temperature control and dynamic exhaust process. According to the method, the pore defect caused by the fact that volatile components are difficult to discharge in the forming process of the high-performance thermosetting polyimide at the temperature higher than 400 DEG C is overcome. The device is simple in structure, low in cost and particularly suitable for large-scale production of the polyimide fiber composite material.

The invention relates to the technical field of knee joint exoskeleton devices, in particular to a viscous damping knee joint exoskeleton device. The knee joint assembly comprises a first rotating assembly and a second rotating assembly which are rotationally connected; the pair of leg connecting assemblies are connected with the first rotating assembly and the second rotating assembly correspondingly, and the pair of leg connecting assemblies are used for being connected with thighs and shanks on the same side of the user correspondingly; the viscous fluid damper comprises a first connecting piece and a second connecting piece which rotate relatively, and the first connecting piece is connected with the first rotating assembly; and the clutch device is arranged between the second connecting piece and the second rotating assembly, and the clutch device is used for switching the rotating coupling state of the second connecting piece and the second rotating assembly, so that the second connecting piece and the second rotating assembly are circumferentially coupled or decoupled. The buffering effect can be effectively improved, and joint impact is reduced.

The invention discloses a TC17 composite board with a mechanical interlocking interface and a preparation method of the TC17 composite board, and belongs to the technical field of composite material preparation. The problems that a current titanium alloy composite board of a sandwich structure is low in interface strength and poor in interface bonding capacity, so that the service strength and the ultimate high-temperature strength of the composite board are low, and the anti-fatigue performance is poor are solved. A Ti750S hollow alloy plate is placed in the middle of a TC17 plate, and the TC17 composite plate of a sandwich structure is obtained through hot press forming. In the hot pressing process, TC17 is filled into holes of Ti750S in a viscous flow mode and permeates with TC17 on the other side, a rivet or anchor rod structure is formed in the holes in the middle layer, a three-dimensional mechanical interlocking structure is formed with the Ti750S layer, an interlocking interface provides strong mechanical bonding force, interface stress is effectively transmitted and dispersed, metallurgical bonding is formed through diffusion bonding, and the mechanical bonding strength is improved. And the interface strength of the TC17 composite board is improved.

An apparatus and a method are shown for removing or moving a viscous fluid such as grease from a first unit such as a bearing e.g. a ball bearing to a second unit via a hose or pipe. The apparatus includes a hose or pipe (7) through which the viscous fluid is pumped during operation from an outlet (11) of the first unit (1) to an inlet (10) of the second unit (2), wherein the apparatus further includes a pump connected to the hose or pipe (7) in such a way that the viscous fluid during operation is moved through the hose or pipe (7), and the hose or pipe (7) includes an inlet (8) for gas such as air, and the flow of gas through the inlet (8) is controlled by a valve (9).

This invention discloses an underwater cooling process that enhances the coupling properties of thermoplastic composites, belonging to the field of composite material processing technology. For thermoplastic composite parts that have just been removed from the mold and are in a high-temperature state, a specific cooling solution is used for jet cooling through an optimized nozzle system. The core of this process lies in the synergistic effect of forced convection, phase change cooling, and dynamic heat conduction. This rapidly reduces the overall temperature of the part (suppressing the formation of large-sized spherulites) while mitigating the temperature gradient in the interfacial region, promoting the full diffusion and entanglement of polymer chains to the surface of the reinforcing fibers within the viscous flow window, thereby optimizing interfacial bonding. By balancing crystallinity and residual stress, this process can increase the interfacial shear strength (IFSS) of the composite material by 15-20%.

This invention provides a viscous flow-state carbazole-indole-based narrow-band blue-violet luminescent material, its preparation method, and its applications, belonging to the field of organic light-emitting materials. The viscous flow-state carbazole-indole-based blue-violet luminescent material prepared by this invention has a main blue-emitting framework obtained by connecting two phenyl groups at positions 2 and 10 of the carbazole-indole group, followed by flexible chain modification at positions 2 and 6 of the benzene group. Its core characteristic is that the molecule exhibits a viscous flow state and displays semiconductor properties. The luminescent material prepared by this invention has a regular molecular structure, good structural extensibility, good solubility, and excellent luminous efficiency, and can be used as a main luminescent material or a plasticized semiconductor molecule, thus showing great application prospects in the field of OLED displays.

The application discloses a method for preparing a thermoplastic composite product, comprising: providing a fiber preform to a feeding section; transferring the fiber preform to a hot pressing section to heat the fiber preform to a first preset temperature, which is greater than or equal to a viscous flow temperature or a melting temperature of a thermoplastic resin, so as to plasticize the fiber preform, and compact the plasticized fiber preform to provide a composite product; and transferring the composite product to a cooling section to cool the composite product to a second preset temperature, which is less than or equal to a crystallization temperature or a glass transition temperature of the thermoplastic resin, so as to shape the composite product. Thus, the fiber orientation of the fiber preform is in a tangential direction perpendicular to a length direction, so that the tensile strength, compression strength and modulus of the composite product in the tangential direction are improved. The method is especially suitable for preparing a composite product in the form of a bar, a pipe or a profile with a similar structure, and the extrusion length can be adjusted according to requirements to improve production efficiency.

The invention discloses a viscoelastic-plastic numerical simulation method, which comprises the following steps of: receiving physical modeling and solving control data of a viscoelastic-plastic material, constructing a convex cone planning model for uniformly describing elastoplasticity, viscoelasticity and friction multi-physical field coupling behaviors according to the physical modeling and solving control data, expressing a plastic yield criterion and a viscous flow law as second-order cone constraints, converting the model into a second-order cone complementary equation; converting the equation into an implicit immobile point iterative equation by adopting a modular system matrix splitting iterative algorithm, performing matrix splitting on a system stiffness matrix, and constructing an iterative solution format with calculation complexity at a quadratic level; and performing iterative calculation to convergence based on the format and the input data, and outputting numerical results of a displacement field, a stress field and a strain field. According to the method, multi-field coupling behaviors are unified to a convex cone planning framework, solving is conducted through an efficient iterative algorithm, the calculation efficiency and stability of large-scale viscoelastic-plastic numerical simulation are improved, and the problem of calculation bottleneck caused by existing commercial software multi-field decoupling and general solver explicit inversion is solved.

The invention discloses high-strength aluminum oxide ceramic and a preparation method thereof. The preparation method comprises the following steps: carrying out urea weak coordination modification on alumina powder, introducing magnesium, silicon and zirconium source compounds in a specific molar ratio, pre-calcining, and sintering at 1500-1700 DEG C to generate a multi-element non-stoichiometric composite solid solution in situ at a grain boundary. The structure can effectively cure free silicon dioxide, construct a high-rigidity grain boundary framework, inhibit grain boundary viscous flow and grain growth, and remarkably improve the bending strength and fracture toughness of the ceramic.

The utility model discloses an extruded SPC plate raised grain eliminating device which comprises a side plate, an eliminating mechanism is arranged on the side face of the side plate, the eliminating mechanism comprises a fixing cylinder fixedly connected to the side face of the side plate, a converging core body aligned with the fixing cylinder is arranged on the other side of the side plate, and a heater body is fixedly connected to the interior of the circumference of the fixing cylinder. Temperature sensor bodies are fixedly connected to the two ends in the circumferential side face of the fixing cylinder. According to the utility model, through the arrangement of the fixed cylinder, when SPC materials enter the fixed cylinder through the confluence core body, the SPC materials are gradually changed into viscous flow from powder and are converged together through the confluence core body to enter the fixed cylinder; the temperature sensor body detects the temperature of the SPC materials entering the fixed cylinder and controls the heater body to conduct heating and heat preservation on the interior of the fixed cylinder, the state of the SPC materials is kept, meanwhile, the machine barrel continuously conveys the materials into the fixed cylinder behind the device, and at the moment, the pressure in the device is large.

Some embodiments are directed to systems and methods for treating a viscous fluid. The viscous liquid may be a liquid sugar. The viscous fluid may have a viscosity of at least 50 cP. The system may include one or more mixers configured to receive the viscous fluid and to generate turbulent flow of the viscous fluid; and one or more UV chambers configured to receive the viscous fluid from the mixer and to expose the viscous fluid to a dose of UV light, the dose being at least 250 mJ / cm2. The system may deliver a total dose of UV light of about 500 mJ / cm2 such that bacteria and other contaminants are reduced or eliminated.

The viscous fluid supply device supplies a viscous fluid for printing. The viscous fluid supply device is provided with: a holder including: an opening through which a cartridge containing a viscous fluid can enter and exit; and an attached portion to which the cartridge is attached by pressing the cartridge inward from the opening portion in the horizontal direction. And a first air supply unit which is provided to the attachment portion so as to be connected to the cartridge in a state in which the cartridge is attached to the attachment portion, and which supplies first air to the cartridge for discharging the viscous fluid from the cartridge.

The present application relates to a drawing process of polybutylene terephthalate (PBT) material, and particularly relates to a flexible and lodging-resistant PBT toothbrush filament and a preparation method thereof, which comprises the following steps: heating and melting polybutylene terephthalate material particles after drying treatment and vacuum packaging in a screw extruder to obtain molten polybutylene terephthalate; filtering through a melt filtration system; extruding through a spinneret of the screw extruder to form viscous flow state primary fibers; introducing the primary fibers into a cooling water bath to obtain viscoelastic state primary fiber filaments; and performing a series of high-drawing processing on the primary fiber filaments so that macromolecular chains are fully ordered to become glassy PBT toothbrush filaments. During the process, the production process is designed to control the breaking strength, breaking strength variation coefficient, breaking elongation, breaking elongation variation coefficient, filament bending recovery rate and the like of the filaments, so as to obtain a flexible and lodging-resistant PBT toothbrush filament and a preparation method thereof.

This invention provides a method for improving the viscous flow characteristics and increasing the carbonization rate of high-titanium slag during the carbonization process, belonging to the field of metallurgical resource comprehensive utilization technology. The steps include: classifying the carbonaceous reducing agent into three particle sizes: fine, medium, and coarse; heating the high-titanium slag to a molten state in an induction furnace and adding the fine-particle carbonaceous reducing agent for initial reaction; then adding the medium-particle carbonaceous reducing agent for further reaction, while continuously blowing inert gas above the molten pool; finally adding the coarse-particle carbonaceous reducing agent for further reaction, while intermittently blowing inert gas above the molten pool; after the reaction is completed, a high-titanium slag carbonization product with improved viscous flow characteristics and increased carbonization rate is obtained. The method provided by this invention achieves improved viscous flow characteristics of the high-titanium slag melt, reduced foaming slag, reduced reducing agent dosage, and increased carbonization rate through the synergistic effect of carbonaceous reducing agent particle size classification, staged feeding, induction furnace melting, and inert gas stirring.

The invention relates to the technical field of composite material magnesium alloy pipe component forming and manufacturing, in particular to a thermoplastic carbon fiber reinforced magnesium alloy composite pipe differential temperature air pressure regulation and in-situ reinforcement integrated forming method which comprises the steps that a magnesium alloy pipe blank is subjected to heat treatment; magnesium alloy pipe blank surface treatment; assembling a magnesium alloy composite pipe prefabricated body; a differential temperature field is constructed for the magnesium alloy composite pipe, so that the thermoplastic resin in the magnesium alloy composite pipe enters a viscous flow state while the magnesium alloy keeps good plasticity; then air pressure and axial feeding cooperative loading is carried out, and precise forming of the mold is achieved; the magnesium alloy composite pipe component is subjected to differential temperature cooling, thermoplastic resin is promoted to be fully infiltrated by means of radial shrinkage compressive stress generated at the interface by means of thermal expansion difference caused by inner and outer layer temperature difference, and in-situ enhancement of the interface of the magnesium alloy composite pipe is achieved; the requirements of high-end equipment for high-performance and high-efficiency preparation of the magnesium alloy composite pipe are met with high integration level and high strength.

Hydraulic delay tool enabling delayed detonation of perforating guns in non-selective oil-well perforating. The tool integrates two systems: a hydraulic delay system and a pressure multiplier. The delay system comprises a first chamber with viscous fluid, a piston that moves linearly to drive the fluid through a pressure-reduction orifice, and a rupture disc that breaks at a predetermined pressure, admitting well fluid. Piston displacement establishes the required delay before detonation. The pressure multiplier uses well-fluid pressure entering a hydraulic-fluid chamber, where a multiplier piston travels, amplifies pressure, and actuates a firing mechanism to detonate the perforating guns. The tool is designed for integration into a non-selective perforating gun string including an anchor, a firing head, and the guns to be detonated. Delay time is set by adjusting the viscous-fluid volume and / or pressure. The invention provides improved control and flexibility for oil-well perforating and safety.