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The rate law or rate equation for a chemical reaction is an equation that links the reaction rate with the concentrations or pressures of the reactants and constant parameters (normally rate coefficients and partial reaction orders). For many reactions the rate is given by a power law such as v = k[A]ˣ[B]ʸ where [A] and [B] express the concentration of the species A and B (usually in moles per liter (molarity, M)).
A numerical simulation method for CO2 mineralization and sequestration in saline aquifers at the pore scale, achieving dynamic coupling of dissolution and precipitation.
PendingCN122263530Aachieve couplingSimplify the simulation solution processDesign optimisation/simulationCAD numerical modellingRate equationSoil science
The application discloses a kind of implementation dissolution-precipitation dynamic coupling's saline aquifer CO2 mineralization storage pore scale numerical simulation method, comprising: constructing geometric model under pore scale;The flow velocity distribution and pressure distribution of geometric model in time and space are calculated;Reaction migration model of the CO2 mineralization storage of saline aquifer is constructed;Kinetics reaction rate equation and porosity dynamic evolution equation are established, ion product-solubility product judgment statement is introduced, the reaction migration model is solved, and CO2 deep saline aquifer mineralization storage reaction migration numerical simulation is completed.The application is coupled by DBS equation and ADE equation, realizes the solution reaction migration numerical simulation under pore scale, simplifies the complex reaction migration numerical simulation solving process;In the process of solving reaction migration, dissolution and precipitation process are coupled simultaneously, more close to real situation;It is suitable for operation under a variety of working conditions, extracts solute transport and dissolution-precipitation rule under different conditions, and provides support for experimental research.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY +1
Method and system for analyzing stability of boundary layer of high-enthalpy ablated wall surface
PendingCN121723911ASustainable transportationDesign optimisation/simulationRate equationChemical reaction
The invention relates to a stability analysis method and system for a boundary layer of a high-enthalpy ablated wall surface, and is applied to the technical field of aerospace, and the method comprises the steps: taking a Landau-Teller equation and a chemical reaction rate equation as source items, constructing a control equation, and solving the control equation to obtain a steady laminar flow field; analyzing the steady laminar flow field by using LST to obtain a transmission coefficient eigenvalue; if the first modal time scale and the second modal time scale are greater than or equal to 1, correcting the first modal time scale and the second modal time scale based on the roughness of each position of the wall surface of the high-speed aircraft, and constructing a first modal linear operator and a second modal linear operator; further constructing NPSE, and solving to obtain an NPSE result; when an NPSE result is decomposed and linearized according to Fourier subharmonics, a coupling source item of a subharmonic equation is constructed according to a second modal linear operator, secondary instability analysis is carried out, and a transition initial position and the amplitude and frequency of disturbance development are obtained. And the accuracy of stability analysis can be improved.
Owner:TSINGHUA UNIVERSITY