310 results about "Viscous flow" patented technology

The invention discloses a deep coal rock in-situ gas content and adsorption / free gas proportion calculation method and device, and relates to the field of reservoir resource potential evaluation.The deep coal rock in-situ gas content and adsorption / free gas proportion calculation method comprises the steps that an isotope fractionation model coupled with a double-dispersion pore structure (matrix pores and kerogen pores) and a multi-gas transmission mechanism (viscous flow, Knudsen diffusion and surface diffusion) is constructed; the accumulated analytic gas quantity and the apparent isotope value of the produced gas obtained through solving are fitted with the actually measured accumulated analytic gas quantity and the apparent isotope value of the produced gas, and key parameters corresponding to the optimal fitting result are obtained; and determining the in-situ gas content, the in-situ adsorption gas proportion and the in-situ free gas proportion according to the productivity evaluation parameters at the initial moment corresponding to the optimal key parameters. According to the method, the in-situ gas content, the in-situ adsorbed gas proportion and the in-situ free gas proportion of the deep coal rock are calculated on the basis of an isotope fractionation model coupled with a double-dispersion pore structure and a multi-gas transmission mechanism, so that the gas resource content of the deep coal rock is predicted.

A reciprocating pump particularly well suited to dispensing oils, creams, and other viscous fluids is contemplated. All components of the pump are fabricated from a single polymer, such as polypropylene or high density polyethylene. The stem of the pump includes a three-piece sealing assembly with a piston that floats in response to the reciprocating action of the pump so as to selectively open or seal the dispensed fluid flow path, as well as return air provided to the internal volume of the container to which the pump is attached.

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 an asphalt self-healing performance evaluation method based on an equal modulus process, and belongs to the technical field of asphalt material performance detection and evaluation.The asphalt self-healing performance evaluation method comprises the steps that the linear viscoelastic stress threshold value tau L of asphalt is determined through a linear amplitude scanning test, and control stress tau T is selected for a fatigue test; sequentially implementing a fatigue test I, an intermittent healing period and a fatigue test II, determining a modulus initial value delta0 and a modulus termination value deltaL in an equal modulus process through dynamic shear modulus change data, and calculating a loading frequency difference deltaN corresponding to the equal modulus process; and establishing a self-healing degree index HI in combination with the normalization processing and the intermittent time, and quantifying the recovery of the fatigue resistance of the asphalt. According to the method, the influence of viscous flow is effectively separated through the equal modulus process, fatigue performance recovery related to molecular diffusion is accurately represented, index reliability is verified through the molecular diffusion model, the problem that in the prior art, asphalt anti-fatigue performance recovery cannot be accurately represented is solved, and a scientific basis is provided for research and development of high-performance asphalt materials.

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 discloses continuous nitration reaction equipment, and relates to the technical field of high efficiency and energy conservation, in particular to continuous nitration reaction equipment, which comprises a reaction tank body and a driving motor arranged at the top end of the reaction tank body, a plurality of reaction cabins capable of being filled with materials are arranged in the reaction tank body, and the plurality of reaction cabins are communicated in sequence; according to the continuous nitration reaction equipment, through the arrangement of the multiple reaction cabins, the stirring rods, the driving blades and the stirring rods, the effects of efficiently mixing materials and improving the heat exchange efficiency can be achieved. A plurality of reaction cabins which are communicated in sequence are arranged in the reaction tank body, and materials can flow through the cabins in sequence to complete multi-stage reaction. The driving motor drives the driving rod, so that the stirring rod rotates at a high speed, strong mechanical acting force is applied to a reaction solution, the solution is promoted to generate complex and strong convection, shearing and diffusion movement, the viscous flow state of an axis area is broken, and efficient mixing is achieved.

The invention provides a floating structure anchoring system design analysis method suitable for a shallow water condition, and particularly belongs to the technical field of floating equipment mooring. The method comprises the steps that firstly, the platform deformation energy requirement is calculated according to a platform structure type, and the residual deformation energy of an anchoring line configuration scheme is calculated based on the deformation energy principle; preferably selecting an anchoring scheme with the maximum residual deformation energy; then, based on a numerical method of a viscous flow theory, an overlapping grid method is coupled with a mooring cable dynamic simulation method, the floating structure motion response and the anchoring safety coefficient of the optimal scheme are checked, the layout scheme of the mooring system is determined through the scheme design and safety checking process, the whole design process is scientific and meticulous in logic, and the design efficiency is high. The method is high in performability and has practical engineering application guiding significance.

The invention belongs to the technical field of near field dynamics, and discloses a method and a system for constructing a convection-reaction-diffusion (ARD) model under a near field dynamics framework. According to the method, a PD-ARD equation suitable for the non-uniform flow condition is firstly provided, and the problem that in the prior art, the ARD problem in a complex flow field is not accurately described is effectively solved. In order to realize more accurate coupling calculation, under a near field dynamics (PD) framework, a PD control equation is adopted to solve a velocity field of fluid, and through coupling of a PD equation of viscous flow and a PD-ARD equation under non-uniform flow, an overall model is formed. The method can accurately simulate the convection-diffusion-reaction problem under the viscous flow condition, is suitable for complex environment modeling of multi-scale and multi-physical field coupling, and is widely applied to the fields of industrial design, environment monitoring, scientific research and the like.

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.

To provide a variable viscous flow resistance structure which belongs to a technical field of a viscous flow resistance, the structure realizing a change of a flow resistance feature curve by overlapping a rotational inertia of a fluid without changing a feature variable unique to the flow resistance structure.SOLUTION: The variable viscous flow resistance structure includes two or more surfaces. In the resistance structure, one or more gap passages are formed between different surfaces, an external fluid flows in the gap passage, and at least one of an upper side surface and a lower side surface of the gap passage rotates.SELECTED DRAWING: Figure 2

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 invention relates to the technical field of composite material manufacturing, in particular to co-extrusion equipment and method for a weather-proof composite material section, the equipment comprises a pultrusion die, the pultrusion die at least comprises three sections in the direction of an infiltration tank of the pultrusion die, and the temperatures of the three sections are controlled to be 50-100 DEG C, 140-200 DEG C and 160-200 DEG C respectively; wherein a second glue injection port communicated with the infiltration tank is arranged between the third section and the fourth section, the PVDF extruder is communicated with the second glue injection port, the temperature of the PVDF extruder is gradually increased from the far end of the PVDF extruder to the second glue injection port, and the temperature of the second glue injection port is controlled to be 180-200 DEG C. The pultrusion mold of the co-extrusion equipment is subjected to segmented temperature control, resin in a high-temperature viscous flow state and PVDF melt are subjected to mutual diffusion and reaction on a contact interface by means of high temperature and then are gradually cured and formed, the process of coating the PVDF film on the surface layer remarkably improves the weather resistance of the thermosetting composite material, the equipment cost is controllable, the production efficiency is improved, and the production cost is reduced. And the production cost is reduced.

The invention provides a rocket aircraft flow field correction method based on multi-fidelity data fusion, and the method comprises the following steps: 1, collecting low-fidelity data, and carrying out the construction of a low-fidelity data set: simulating the change process of an unsteady flow field around an object in a finite time step through a Reynolds time-average simulation method or a large vortex simulation method; 2, data correlation analysis is carried out, wherein a linear relation model yH = rho (x) yL + delta (x) of a non-viscous flow field yL and a viscous flow field yH of the rocket aircraft is established; step 3, neural network architecture design: constructing a low-fidelity data approximation network NNL; 4, performing hyper-parameter learning and optimization; defining a loss function; 5, performing data acquisition and preprocessing: performing high-fidelity viscous flow field data acquisition, and preprocessing the acquired high-fidelity and low-fidelity flow field data; and step 6, model training and verification.

The rotary damper prevents the viscous fluid filled inside from leaking out in high temperature environments such as outdoors in the blazing sun in summer and low temperature environments such as outdoors in winter. [Solution] A space is provided in the rotor 2 and cylinder portion of the rotary damper to absorb pressure changes inside the cylinder 1 that occur due to temperature changes in the viscous fluid, and bubble cushioning or porous cushioning material is placed to reduce internal pressure changes in the cylinder, thereby reducing leakage from the gasket and other sealing parts of the damper body and the intrusion of outside air and rainwater.

The invention provides a micro-nano cross-scale pore gas permeability detection method of a deep coal seam, and belongs to the technical field of pore gas permeability detection of the deep coal seam. The technical problem to be solved is to provide the micro-nano cross-scale pore gas permeability detection method for the deep coal seam. According to the technical scheme, the method comprises the following steps: analyzing a gas transmission mechanism of micro-nano scale pores, and respectively establishing calculation models of a surface diffusion transmission mechanism, a Knudsen diffusion transmission mechanism and a slippage or viscous flow transmission mechanism; respectively establishing weighting factors of a Knudsen diffusion transmission mechanism and a slippage or viscous flow transmission mechanism; establishing a calculation model of additional pressure drop caused by the end effect, and finally establishing a calculation model of the micro-nano-scale pore gas logging permeability of the deep coal seam through the coupling weighting factor and the end effect. The method is applied to detection of the deep coal seam pore gas permeability.

The invention relates to a method for forming an annular micro-channel in a conductive polymer PMMA / CB material based on a thermal-electric coupling effect, which comprises the following processing steps of: 1, performing annular array hole processing on the conductive polymer PMMA / CB, and processing micropores in an annular array on the surface of the conductive polymer PMMA / CB; 2, performing thermal field processing on the conductive polymer PMMA / CB treated in the step 1, and heating the conductive polymer PMMA / CB to a viscous flow state so as to form an internal micro-channel structure; and applying a rotating electric field to form the internal annular micro-channel. Based on a phase field model theory, the conductive polymer PMMA / CB is used for processing by using a thermal-electric coupling method, and a new scheme is provided for manufacturing the internal annular micro-channel.

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.

A method of continuously filtering contaminants from a contaminated viscous fluid may include pumping the contaminated viscous fluid between a non-perforated surface as a first cylinder and a second perforated surface as a second cylinder, the non-perforated surface and the second perforated surface are disposed substantially parallel to each other with a defined first gap; the second cylindrical body comprises one or more longitudinal fins protruding from the second cylindrical body toward the perforated surface of the first cylindrical body into the first gap, and the second cylindrical body comprises one or more longitudinal fins protruding from the second cylindrical body toward the perforated surface of the first cylindrical body into the second gap. A second gap is formed between the distal tip of the fin and the perforated surface, thereby forcing the contaminated viscous fluid to move in a direction substantially parallel to the relative velocity, thereby creating a shear rate in the contaminated viscous fluid near the perforated surface in a direction substantially parallel to the relative velocity.

The invention relates to the technical field of building pile foundations, and discloses an anti-seismic pile foundation structure for a green building, the anti-seismic pile foundation structure for the green building comprises an integral external mechanism, the integral external mechanism further comprises two precast piles, and the anti-seismic pile foundation structure for the green building aims to solve the problem that a certain position of a pile foundation is subjected to large impact instantly, so that a pile body is bent; through viscous flow friction loss, a part of vibration generated by seismic waves can be absorbed, vibration transmitted to an upper building is reduced, a first limiting block can also generate certain displacement, and during displacement, the first limiting block can extrude a first sliding block to slide in a first sliding groove to extrude gas in the first sliding groove, so that the gas in the first sliding groove is extruded; a part of kinetic energy generated by an earthquake is consumed and converted into friction heat energy through sliding, through energy conversion and shock absorption buffering, it is avoided that a certain position of a pile foundation is subjected to large impact instantly, and consequently a pile body is bent, and meanwhile the influence of earthquake waves on a building is reduced to a certain degree.

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.

Provided is a viscous fluid supply apparatus capable of simplifying apparatus configuration for confirming the type of viscous fluid and determining the remaining amount of the viscous fluid.　The viscous fluid supply apparatus executes a process of supplying viscous fluid to a supply target. The viscous fluid supply apparatus comprises: an attachment unit to which a storage container for storing the viscous fluid can be detachably attached; a recognition unit for recognizing an identification information section provided on the storage container; and a control unit for determining the type of the viscous fluid stored in the storage container on the basis of the identification information indicated by the identification information section recognized by the recognition unit, and determining the remaining amount of the viscous fluid in the storage container on the basis of the position of an identification section on the storage container recognized by the recognition unit.

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.

The inspection device disclosed herein is used for an installation system including an installation device for configuring components on a substrate. The inspection device includes a control unit that extracts an area included in a captured image obtained by capturing a processing object with a viscous fluid formed at a predetermined position, calculates the center of gravity of the extracted area, and determines whether the center of gravity is included in a standard range of the predetermined position serving as a reference for the captured image, thereby determining whether a bridge of viscous fluid is generated across adjacent predetermined positions.

The present invention discloses an environmentally friendly device for removing bubbles from viscous fluids, belonging to the field of removing bubbles from viscous fluids. The environmentally friendly device for removing bubbles from viscous fluids includes: a vacuum barrel, a sealing cover, and a vacuum pump. The sealing cover is threadedly connected to the upper end of the vacuum barrel, and the air extraction end of the vacuum pump is communicated with the inside of the vacuum barrel. It further includes: an inner barrel fixed inside the vacuum barrel, and the upper end of the inner barrel is communicated with the inside of the vacuum barrel; a motor fixed on the sealing cover; a rotating shaft fixed on the output end of the motor; a conical plate fixed on the rotating shaft, and the conical plate is coaxially arranged with the rotating shaft. The present invention effectively increases the contact area between the fluid body and the vacuum cavity, thereby effectively improving the efficiency of removing bubbles in the polymer fluid body, and effectively preventing the fluid body with most bubbles removed from affecting the bubble removal effect of the fluid body in the first diversion groove.

Embodiments herein disclose a method for fabricating high aspect ratio structures. The method includes depositing a predefined quantity of a viscoelastic fluid on a top surface of a bottom cell plate and compressing the viscoelastic fluid deposited on the top surface of the bottom cell plate using a bottom surface of a top cell plate. The viscoelastic fluid is a blend of a solvent and a polymer. At least one of the top cell plate and bottom cell plate comprises a plurality of lands, sealed source holes and / or unsealed source hole for penetration of a low-viscous fluid. Further, the method includes separating the top cell plate and the bottom cell plate to induce out of plane stretching of the high viscous fluid and obtaining a plurality of high aspect ratio structures between the top cell plate and the bottom cell plate due to the penetration of the low-viscous fluid.

Apparatus, methods, systems, etc., for the tangential flow filtration (TFF) of viscous compositions including viscous fluids, solutions, gels, pastes, creams and suspensions with viscosities greater than 10 cP, 20 cP, 50 cP or 100 cP. The methods, etc., provide enhanced mixing of the viscous compositions in their storage vessels by extracting the input composition from different depths in the storage vessels to reduce or eliminate vertical concentration gradients.

The present invention relates to a resin composition and a foam substrate, in which the resin composition comprises a first resin and a solvent, in which the viscous flow activation energy of the first resin is 5-40 kJ / mol under the conditions of 120-180 DEG C and a shear rate of 0.05 s <-1 >-1 s <-1 >, the surface tension of the resin composition is 25-70 mN / m, and the viscosity of the first resin is 5-40 kJ / mol under the conditions of 120-180 DEG C and a shear rate of 0.05 s <-1 >-1 s <-1 >. The foam base material comprises a foam core material and a coating coated on the surface of the foam core material, and the coating is obtained by curing the resin composition. The resin composition can completely coat the surface of a foam core material, so that the improvement effects of water absorption and weather resistance of the foam core material are remarkably improved, and a foam base material prepared from the resin composition has excellent environmental tolerance, does not easily absorb water and can be better applied to the technical field of communication.

The invention relates to the technical field of structure wind resistance theories and design, and discloses a box girder flutter performance rapid evaluation method based on a potential flow theory, the potential flow solution of streamline box girder unsteady aerodynamic force is deduced based on the potential flow theory, the aerodynamic force potential flow solution has a clear expression, the calculation efficiency is high, and the box girder flutter performance rapid evaluation method can be applied to the field of box girder flutter performance rapid evaluation. However, the viscosity effect is neglected, and the precision still needs to be improved, so that the method compares and analyzes the difference between the potential flow solution and the viscosity flow solution. According to the box girder flutter performance rapid evaluation method based on the potential flow theory, the powerful nonlinear capability of a neural network model is utilized, after the model is trained, a target result can be rapidly calculated according to input parameters, then the neural network model is established based on corrected potential flow solution data, wind tunnel test equipment is not used, and the flutter performance of the box girder can be rapidly evaluated. And finally, the aerodynamic potential flow solution is well matched with the viscous flow solution after being corrected, and the flutter performance prediction effect is good when the method is applied to flutter performance prediction.