11 results about "Mass diffusion" patented technology

The invention relates to a CFD (Computational Fluid Dynamics) method for nearly continuous hypersonic high-temperature thermochemical unbalanced flow numerical simulation, which comprises the following steps of: 1, introducing a Park double-temperature model into an NS equation to describe a thermochemical unbalanced effect at high temperature, and closing a shear stress tensor, a heat flow vector and a mass diffusion flux by adopting an equivalent constitutive model to obtain a closed shear stress model; capturing speed slippage and temperature jump phenomena on the wall surface by adopting corresponding slippage boundary conditions to obtain a macroscopic control equation and boundary conditions suitable for near-continuous hypersonic high-temperature thermochemical non-equilibrium flow; 2, discretely solving the macroscopic control equation and the boundary conditions given in the step 1 by adopting a finite volume method; and step 3, performing post-processing on a solution result obtained in the step 2 to obtain a streaming flow field, a wall surface aerodynamic force and a wall surface heat flow of the calculated appearance.

The invention provides bionic fractal micro-channel reactor equipment for fluid fuel hydrogen production, which is particularly suitable for marine mobile hydrogen production scenes such as a ship power system and an offshore hydrogen refueling station. The microreactor adopts an upper, middle and lower layer functional structure design, and comprises a diversion diffusion area, a chemical reaction area and a product buffer collection area, the diversion diffusion area and the product buffer collection area are fractal tree-shaped microchannels with optimal continuous length ratio and mass diffusion flux, and the diffusion resistance of reactants can be remarkably reduced. By virtue of the characteristics of compact structure, vibration resistance and easiness in integration of the fractal microchannel, uniform distribution and efficient transportation of reactants are realized, heat and mass transfer performance can be enhanced under harsh working conditions of the ocean, and hydrogen production efficiency and system reliability are improved by combining efficient heat source supply and fuel conversion processes; and the requirements of an ocean mobile platform on efficient, compact and stable hydrogen production equipment are met.

The invention discloses an interface fusion welding method and equipment, and belongs to the technical field of diffusion welding. The problem that in the metal diffusion welding process, in order to form tight interface contact, external pressure is excessively relied on, and consequently the deformation amount of base metal is large is solved. And meanwhile, the problem that the temperature of a welding interface is not uniform in traditional welding is solved. The method comprises the following steps: polishing the high-temperature alloy until no obvious scratch exists on the surface, sequentially carrying out ultrasonic cleaning with acetone and absolute ethyl alcohol, and drying; fixing the sample on a sample table of a magnetron sputtering device, vacuumizing, introducing inert gas, carrying out magnetron sputtering on nickel and aluminum at the same time, and then carrying out magnetron sputtering on silver; then, placing in absolute ethyl alcohol for ultrasonic cleaning, placing in a NaOH solution, heating in a water bath for immersion cleaning, and washing with deionized water; then, putting into an HCl solution, carrying out immersion cleaning, washing with deionized water, carrying out ultrasonic cleaning with absolute ethyl alcohol, and drying; and then laminating the plated surface, and performing magnetic field-assisted induction heating diffusion welding. Small-deformation and high-quality diffusion welding of metal at a relatively low temperature is achieved.

The application belongs to the technical field of composite material preparation, and particularly relates to a preparation method and application of a B-NiCo2O4@NiCo-MOF composite material. Boron-modified nickel cobaltate is prepared, and is used as a precursor to prepare the B-NiCo2O4@NiCo-MOF composite material through a hydrothermal method. The electronic structure of the NiCo2O4 is regulated through B, which effectively improves the conductivity and active site exposure of the material. In combination with the porous characteristics of the NiCo-MOF, the composite material with a hierarchical structure is formed, the synergistic optimization of electronic transmission and mass diffusion is realized, and the composite material is applied to the preparation of a supercapacitor positive electrode, so that the specific capacity and rate response performance of the electrode material are improved, and the supercapacitor has high energy density and super-long service life.

The invention discloses a titanium alloy diffusion bonding joint with a double-heterostructure, and the grain size of the bonding joint is in'fine-coarse-fine 'gradient distribution in the direction from a weld interface to a matrix. The invention further discloses a preparation method and application of the titanium alloy diffusion bonding joint with the double-heterostructure. According to the method, a gradient nanocrystalline layer and a high-density dislocation structure are formed on the to-be-connected surface through the composite surface treatment process of multi-pass high-energy shot blasting and ultrasonic surface rolling, a rapid channel is provided for atomic diffusion at low temperature, high-quality diffusion connection of titanium alloy can be achieved at the low temperature of 700-800 DEG C, and the shear strength of an obtained connection joint is larger than or equal to 600 MPa; and equipment used in the technological process is conventional industrial equipment and can be directly applied to an existing production line conveniently, large-scale equipment transformation is not needed, the investment cost is low, and the implementation efficiency is high.

The invention discloses a numerical analysis method for quantifying differential diffusion in coal / ammonia blending combustion, and belongs to the technical field of coal / ammonia co-combustion numerical simulation. The method comprises the following steps: establishing a gas-solid two-phase control equation and a total mixed fraction general transport equation based on element conservation, and defining exclusive difference diffusion quantization parameters; a non-unity constant Lewis number is adopted to calculate mass diffusion, a model is discretized through a PIMPLE algorithm, and a speed-pressure field is coupled; combustion characteristic data are obtained through CP-DNS solving, and the influence rule of difference diffusion on component distribution and a temperature field is compared and analyzed. According to the method, the problem of incomplete physical process characterization caused by the fact that a traditional model ignores differential diffusion is solved, the diffusion difference of heavy / light components and the effect on the combustion process can be systematically quantified, and a reliable numerical tool is provided for optimization design of a coal / ammonia co-combustion system.

The invention relates to the technical field of geothermal development, and discloses a U-shaped well heat and mass transfer numerical simulation method. Comprising the following steps: collecting parameters such as formation lithology, porosity and permeability to construct a three-dimensional heterogeneous formation model; establishing an in-well fluid Navier-Stokes equation, a stratum heat conduction equation, a dissolved mass diffusion equation and a coupling model of a heat / mass exchange boundary; starting a discrete heat boundary according to lithologic interface heat conductivity coefficient jump greater than or equal to 50%, and starting a heat flux maintaining boundary according to well inlet temperature change rate greater than or equal to 5 DEG C / h; unstructured grids are adopted, and well periphery grids are compacted to be smaller than or equal to 1 m; initializing a temperature field and well inlet parameters according to the geothermal gradient; iteratively solving by combining a finite volume method with a k-epsilon turbulence model (convergence precision is less than or equal to 10 <-6 >); and comparing actual measurement data optimization parameters, and adjusting the stratum heat conductivity coefficient or the grid density when the deviation is greater than 5%. According to the method, a heterogeneous stratum heat transfer mechanism is accurately described, and the reliability of geothermal engineering design is improved.

This invention discloses a numerical analysis method for quantifying differential diffusion in coal / ammonia co-combustion, belonging to the field of numerical simulation technology for coal / ammonia co-combustion. The steps include: establishing gas-solid two-phase governing equations and a general transport equation for the total mixture fraction based on element conservation; defining specific differential diffusion quantification parameters; calculating mass diffusion using a non-unity constant Lewis number; discretizing the model using the PIMPLE algorithm and coupling it with a velocity-pressure field; obtaining combustion characteristic data through CP-DNS solution; and comparing and analyzing the influence of differential diffusion on component distribution and temperature field. This invention solves the problem of incomplete physical process characterization caused by traditional models neglecting differential diffusion, and can systematically quantify the diffusion differences of heavy / light components and their effects on the combustion process, providing a reliable numerical tool for the optimized design of coal / ammonia co-combustion systems.

The invention discloses a semi-artificial breeding method for solieria seedlings, and relates to the technical field of solieria cultivation. According to the method, an efficient and stable denseleaf crazyweed seedling breeding technical system is systematically established for the first time, the provided seedling breeding method comprises the steps of algae seed selection, algae seed treatment, spore diffusion, indoor seedling breeding, medium-term culture and the like, wild mature algae are used as algae seeds, and the genetic stability of germplasm is guaranteed; by means of treatment such as shade-drying stimulation, spore diffusion and seedling collecting culture, concentration and mass diffusion of fruit spores are achieved, the method has the advantages of being short in seedling collecting period and high in seedling attachment rate, the overall seedling obtaining efficiency can be greatly improved, and the problems that seedling sources are unstable and the yield is low are effectively solved. The solieria seedlings cultivated by the method can be directly used for circulating water factory-like large-scale cultivation and do not need to be put into sea area cultivation, so that the risk of uncontrollable factors in the sea area is reduced, the utilization rate of carpospores and seedlings is increased, and the labor cost is reduced.

The invention discloses a project-oriented potential scientific research team mining method based on network diffusion, and the method comprises the following steps: obtaining and preprocessing academic data, and constructing an author-paper bipartite graph network; initializing a seed paper set according to a reference coupling relationship of the target subject, and constructing an initial influence signal in a paper layer of the bipartite graph network; parallelly executing two network diffusion processes of mass diffusion and heat conduction on the bipartite graph network, and respectively calculating to obtain an author influence vector and an author influence vector under a heat conduction mechanism; normalizing the two obtained author influence vectors, and performing linear weighted fusion by adjusting parameters to obtain a final mixed influence vector; sorting all authors according to the mixed influence vector, and selecting the top authors as potential scientific research team recommendation; the method is suitable for scientific research environments in different periods.

The invention discloses a gastrodia elata quality nondestructive testing system based on a hyperspectral imaging technology, and relates to the technical field of gastrodia elata processing equipment.The gastrodia elata quality nondestructive testing system is characterized in that the system is connected in series according to S1-S6: PRI, BWI and time constants are collected and extracted according to temperature and humidity perturbation and time sequence; thermal / mass diffusion generates a depth weight D (x, y) to inhibit surface dominance; multi-angle reflection and diffuse transmission imaging are carried out to obtain multiple geometric spectrums; carrying out physical micro body rendering inversion in combination with non-negative unmixing, and outputting voxel distribution and virtual slices of water, polysaccharide, gastrodin, p-hydroxybenzyl alcohol, parishin, starch and the like; if not, triggering photoacoustic calibration to obtain density and a cavity mask; the consistency of fusion dynamic, imaging and acoustics is updated through the posteriori of the serial product formula; and generating a TFC fingerprint code through posterior distillation and optimizing few bands, thereby realizing second-level online grading and low-cost deployment. According to the system, dynamic, structural and chemical three-dimensional information is synchronously obtained without damaging a sample, the accuracy, depth resolution and robustness are improved, and the system is suitable for production line quality control and traceability.