3 results about "Internal diffusion" patented technology

The application discloses a method for measuring internal diffusion coefficient and surface interfacial permeability of porous materials, which comprises the following steps: measuring the change of desorption amount of the porous materials under the condition of being swept by a carrier gas after adsorption equilibrium by using a zero-length column method; determining the initial time of desorption of the porous materials according to the change data of adsorbate concentration signal of the empty tube experiment under the same test condition; processing the obtained change data of desorption amount, integrating the desorption concentration with respect to time, so as to obtain the change data of the desorption mass fraction; determining the limiting mechanism of the mass transfer process of the porous materials, establishing a mass conservation equation for describing the test system of the porous materials, and obtaining a control equation for describing the change process of the desorption amount through mathematical derivation; and directly and simultaneously obtaining the internal diffusion coefficient and the surface interfacial permeability of the porous materials through calculation and fitting of the control equation obtained through derivation and the change data of the desorption amount of the porous materials measured through experiments.

The application relates to the technical field of intelligent water treatment control, and discloses a system for simulating and predicting the kinetics of the adsorption capacity of biochar, which comprises the following modules: a data acquisition module uses the Arrhenius equation to introduce a temperature correction coefficient to perform thermodynamic compensation on adsorption kinetic constants; a flow state recognition module determines a forward adsorption or reverse desorption working condition based on the Langmuir model; a resistance decoupling module calculates the mass transfer Biot number based on the double membrane theory to distinguish the liquid film and the internal diffusion resistance of the particles, and uses a physical blockage index to distinguish physical blockage and chemical saturation; a hysteresis compensation module introduces a hysteresis correction factor to correct the desorption equilibrium concentration and calculate the recovery adsorption capacity during the reverse desorption; and a service life prediction module uses a dynamic utilization rate coefficient to correct the theoretical residual capacity and generate operation and maintenance instructions. Through the resistance decoupling and hysteresis compensation mechanisms, the physical and chemical attenuation mechanisms are effectively distinguished, and the precise prediction of the adsorption breakthrough time under dynamic working conditions is realized.

In various embodiments, superconducting wires incorporate diffusion barriers composed of Nb alloys or Nb—Ta alloys that resist internal diffusion and provide superior mechanical strength to the wires.