A design method of a multi-physical field coupling electric field descaling device

Abstract

The application belongs to the field of fouling removal device design, and particularly relates to a fouling removal device design method based on multi-physical field coupling electric field, which comprises the following steps: building a geometric model, adding a blowdown port to the outlet of a pipeline, building the geometric model, using an electric field module to complete simulation and analog of non-uniform electric field in the pipeline, and analyzing the density, strength and weakness of electric field lines in the electric field generated by the electrode in the pipeline; on the basis of the electric field simulation solution result, applying a laminar flow field to obtain an electric field-fluid field coupling physical field; through a flowing particle tracking module, solving the motion trajectory of the particle, adjusting the structure of the geometric model and the environment of the electric field and the fluid field according to the motion trajectory, and repeatedly adjusting and solving the motion trajectory to obtain the device, so that the calcium carbonate particle fouling in water changes the original motion trajectory under the action of the electric field, the particle fouling in the pipeline can flow out of the pipeline, the cleanliness of the pipeline in the heat exchange system is ensured, no pollution is caused, and the operation is simple.

Description

Technical Field

[0001] This invention belongs to the field of scale inhibition and descaling device design, specifically a design method for a scale removal device based on multi-physics field coupled electric field. Background Technology

[0002] In industrial circulating cooling water, scaling is a major cause of reduced heat transfer efficiency and equipment lifespan, and in severe cases, it can affect industrial safety. Therefore, scale adhering to industrial heat exchange equipment must be treated; however, the cleaning process inevitably leads to reduced production time and output. The main components of scale are sparingly soluble salts such as calcium carbonate, magnesium carbonate, and calcium sulfate. As the system operates for longer periods, these sparingly soluble salt ions combine, precipitate, and accumulate on the tube walls of the heat exchanger, increasing the thermal resistance and thus affecting the heat transfer efficiency, resulting in energy waste and reduced equipment performance. Furthermore, the corrosive effect of scale can shorten the service life of heat exchange equipment and, in severe cases, even cause safety accidents such as tube rupture. Therefore, research on effective prevention and control measures for scale deposition and accumulation is urgent and of great significance.

[0003] Domestic and international scholars have conducted extensive research on scale inhibition and removal, with commonly used methods including chemical and physical methods. Chemical methods mainly include ion exchange resin methods, chemical softening methods, and the application of scale inhibitors. While chemical scale inhibition and removal methods are simple to use, they inevitably cause water pollution. Physical methods include electrostatic water treatment, ultrasonic water treatment, and electromagnetic field water treatment. Physical methods have low investment costs, zero pollution, long effective periods, and are easy to install, while simultaneously removing scale, inhibiting scale, and sterilizing, thus gaining widespread attention both domestically and internationally.

[0004] Currently, scholars both domestically and internationally have shown widespread interest in the field of electric field scale inhibition, proposing many effective electric field scale inhibition schemes. However, the selection of the electric field varies under different operating conditions, resulting in a difference of nearly several thousand volts in the optimal electric field strength parameters for scale inhibition, and the influence of the electric field magnitude on scale inhibition characteristics remains questionable. On the other hand, most research interests in electric field scale inhibition focus on changes in the morphology of calcium carbonate scale crystals, with little research on different types of scale particles already formed. Severe scale particle adhesion has a significant impact on the thermal-hydraulic performance of heat exchangers, hindering the practical and effective promotion of this technology in real-world applications.

[0005] The invention disclosed in CN106698685A, entitled "Composite Strong Electric Field Effect Type Electrochemical Water Treatment Device and Descaling Method," utilizes a newly added high-voltage electric field effect to superimpose electric fields, thereby increasing the migration rate of minerals and the rate of scale formation in the water. A continuously rotating scraper scrapes off the scale from the tank shell, which is then discharged along with the wastewater from the drain outlet, completing the descaling process. However, due to the continuous rotation of the scraper, there is a possibility of friction against the pipe wall, or even damage to the pipe wall.

[0006] The invention disclosed in publication number CN200610077527.X, entitled "High-Frequency Electronic Descaling and Inhibition Device," is a water treatment device in which the form of water changes after passing through the device's high-frequency electromagnetic field. This altered water, when used in a heat exchange system, can achieve descaling and scale inhibition. However, the electrodes of this device are placed in the water, and long-term exposure inevitably leads to electrochemical corrosion, resulting in low electrode utilization efficiency and unsatisfactory descaling effect over long-term use.

[0007] Currently, scholars both domestically and internationally have shown widespread interest in the field of electric field scale inhibition, proposing many effective electric field scale inhibition schemes. However, the selection of the electric field varies under different operating conditions, resulting in a difference of nearly several thousand volts in the optimal electric field strength parameters for scale inhibition, and the influence of the electric field magnitude on scale inhibition characteristics remains questionable. On the other hand, most research interests in electric field scale inhibition focus on changes in the morphology of calcium carbonate scale crystals, with little research on different types of scale particles already formed. Severe scale particle adhesion has a significant impact on the thermal-hydraulic performance of heat exchangers, hindering the practical and effective promotion of this technology in real-world applications. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a design method for a descaling device based on multi-physics field coupled electric field. By using electric field, fluid field and flowing particle tracking coupled simulation, the flow velocity distribution, pressure distribution and electric field distribution of the fluid inside the pipe are obtained. The force and trajectory of the particles in the electric field inside the pipe are simulated, and then the descaling device is set according to the simulation results.

[0009] This invention is implemented as follows:

[0010] A design method for a descaling device based on multiphysics coupled electric field is proposed. The method utilizes the electric field module, laminar flow module, and flow particle tracking coupling module in Comsol Multiphysics simulation software for simulation. Specifically, it includes:

[0011] Build a geometric model, and construct a pipe with one end as the inlet and the other end branching to form an outlet and a sewage outlet.

[0012] A non-uniform electric field was simulated inside a pipe using an electric field module.

[0013] By applying a fluid field inside the pipe using a laminar flow module, the coupled physical field of electric field and fluid field is obtained, thus completing the environment setup for the model.

[0014] A certain number of particles are released at the inlet of the pipe using a flow particle tracking coupling module. The particles are subjected to the forces of fluid and electric field inside the pipe, and their motion trajectory is solved.

[0015] By adjusting the parameters of the electric field module, laminar flow module, and flow particle tracking coupling module, different particle trajectories are simulated. The actual sewage discharge device is then configured according to the parameters of the electric field module, laminar flow module, and flow particle tracking coupling module corresponding to the required trajectories.

[0016] Furthermore, the electric field module performs electric field simulation, including constructing electrodes on the pipe, applying electrode excitation conditions, establishing the electric field distribution of the fluid inside the pipe, and simulating the density and strength of the electric field lines generated by the electrodes inside the pipe.

[0017] Furthermore, the laminar flow module is used to set the inlet and outlet of the pipeline fluid, and to simulate the flow velocity of the fluid at different locations within the pipeline.

[0018] Furthermore, by using the flow particle tracking module to set the particle release inlet, release time, and release method, and combining the electric field-fluid field coupling physical field to obtain the fluid drag force and electric field force acting on the particle, the motion trajectory of the particle is obtained.

[0019] Furthermore, the electric field module uses frequency domain analysis to set the boundary conditions of the measured field and the excitation conditions of the electric field, performs mesh generation on the region and solves the problem to complete the simulation of the electric field environment, wherein:

[0020] The governing equations describing the electric field are Maxwell's equations.

[0021]

[0022]

[0023]

[0024] Where J is the current density; Q j，v σ is the current source; σ is the conductivity; D is the current flux; J e External current density.

[0025] Furthermore, in the frequency domain analysis using the electric field module, the control equation of the electric field is set as the control for the study, the boundary conditions of the measured field and the excitation conditions of the electric field are set, the solution region is the entire geometric model, and the excitation condition is the electric potential, which includes positive and negative electric potentials. The electrodes are arranged in a multi-electrode array, with each electrode having the same width and the same spacing, and alternating between positive and negative at the same time.

[0026] Furthermore, the laminar flow module describes the governing equations for laminar two-phase fluid flow:

[0027]

[0028]

[0029]

[0030] Where ρ is density; u is flow velocity; p is pressure; I is the pressure coefficient of this phase; K is the generalized momentum source phase; F is the volume force; and T is temperature.

[0031] Furthermore, the equations of the laminar flow module are set as the control for the study, boundary conditions are set, the solution domain is the entire geometric model, the pipe wall condition is no slip, the right pipe wall is selected as the inlet, the inlet velocity direction is normal flow, the two left pipe walls are selected as the outlet, the outlet boundary condition is set as pressure, the pressure condition is static pressure, and backflow is suppressed, and then the steady-state solver is used to solve the problem to obtain the velocity distribution map inside the pipe.

[0032] Furthermore, the flow particle tracking module is configured to simulate the forces acting on a single spherical dirt particle in the fluid:

[0033]

[0034] Where m is the particle mass; u c The velocity of the particles;

[0035] F D The drag force exerted on the particles by the fluid is expressed as:

[0036] F D =3πμd(u f -u c )

[0037] Where μ is the fluid viscosity; u f For fluid velocity; u c The velocity of the particles;

[0038] Particle motion equations:

[0039]

[0040]

[0041] Where m p v is the particle mass; f is the velocity; F is the force acting on the particle; q is the particle position.

[0042] Furthermore, using transient analysis of the flow particle tracking module, the particle inlet and outlet are set, both of which are the same as the inlet and outlet settings of the laminar flow field. The inlet coordinate system is the global coordinate system, the particle release time distribution method is set to a value list, the initial release condition is set to uniform distribution, the initial velocity is coupled with the laminar flow field, and the outlet wall condition is set to frozen. The particles are subjected to drag force, the solution domain is the entire geometric model, the coordinate system is the global coordinate system, the drag force law is Stokes, the velocity is coupled with the laminar flow field, and all particles are affected. The particles are subjected to dielectric force by an electric field, the solution domain is the entire geometric model, the coordinate system is the global coordinate system, the force action method is coupled with the current field, and all particles are affected.

[0043] Compared with the prior art, the beneficial effects of this invention are as follows:

[0044] This invention utilizes coupled simulation of electric field, fluid field, and flowing particle tracking to obtain the fluid velocity distribution, pressure distribution, and electric field distribution inside the pipe, and analyzes the force and trajectory of particles in the electric field within the pipe. This provides a simulation closer to reality. Simultaneously, it analyzes the motion trajectory of particles within the pipe and extracts the forces acting on the particles in the electric field, achieving scale removal simulation based on the electric field. Based on the simulation results, it designs the electric field, flow velocity, and pipe drainage structure. The designed drainage structure alters the original trajectory of calcium carbonate particles in the water under the influence of the electric field, allowing the particles to flow out of the pipe, ensuring the cleanliness and pollution-free operation of the heat exchange system. The descaling device designed using this invention's simulation method utilizes the dielectric force of the electric field on the particles, causing them to flow out from the drain outlet, ensuring the cleanliness of the fluid within the heat exchange pipe and preventing scale buildup inside the pipe. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the geometric structure of the electric field descaling pipe of the present invention;

[0046] Figure 2 This is a diagram showing the distribution of electric field lines inside the pipe of the electric field descaling device of the present invention;

[0047] Figure 3 This is a diagram showing the simulation results of the flow velocity inside the pipe according to the present invention;

[0048] Figure 4 This is a schematic diagram illustrating the movement of dirt particles unaffected by an electric field according to the present invention;

[0049] Figure 5 This is a schematic diagram illustrating the movement of dirt particles under the influence of an electric field according to the present invention. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0051] A design method for a descaling device based on multiphysics coupled electric field is proposed. The method utilizes the electric field module, laminar flow module, and flow particle tracking coupling module in Comsol Multiphysics simulation software for simulation. Specifically, it includes:

[0052] Build a geometric model, and construct a pipe with one end as the inlet and the other end branching to form an outlet and a sewage outlet.

[0053] A non-uniform electric field was simulated inside a pipe using an electric field module.

[0054] By applying a fluid field inside the pipe using a laminar flow module, the coupled physical field of electric field and fluid field is obtained, thus completing the environment setup for the model.

[0055] A certain number of particles are released at the inlet of the pipe using a flow particle tracking coupling module. The particles are subjected to the forces of fluid and electric field inside the pipe, and their motion trajectory is solved.

[0056] By adjusting the parameters of the electric field module, laminar flow module, and flow particle tracking coupling module, different particle trajectories are simulated. The actual sewage discharge device is then configured according to the parameters of the electric field module, laminar flow module, and flow particle tracking coupling module corresponding to the required trajectories.

[0057] First, a geometric model is built, adding an extra drain outlet to the pipe to maximize the outflow of dirt particles and ensure that clean water flows out of the outlet. Based on this geometric model, an electric field module is used to simulate the non-uniform electric field inside the pipe. Electrodes are constructed using the electric field module, and excitation conditions are applied to simulate the electric field distribution of the fluid within the pipe. The density and strength of the electric field lines generated by the electrodes within the pipe are then analyzed. Based on the electric field simulation results, a fluid field and a laminar flow field are applied. The inlet and outlet of the pipeline fluid are set, and the flow velocity at different locations within the pipeline is analyzed to obtain the coupled physical field of the electric field and fluid field, completing the model's environment setup. Through the flow particle tracking module, the particle release inlet, release time, release method, fluid drag force on the particles, and electric field force on the particles are set. A certain number of particles are released from the pipeline inlet, experiencing the forces of fluid and electric field within the pipeline. The motion trajectory is solved, and based on the trajectory, the geometric model structure and the electric and fluid field environments are adjusted. Repeated adjustments and trajectory simulations yield the optimal sewage discharge device. Specifically: the electric field module calculates the electric field, current, and potential distribution in the conductive medium; the laminar flow module calculates the velocity and pressure fields of single-phase fluid flow under laminar flow conditions. This interface solves the Navier-Stokes equations for momentum conservation and the continuity equation for mass conservation. It can be used for steady-state and transient analyses. The fluid flow particle tracking module calculates particle motion in the background fluid. The motion of particles is driven by drag, gravity, and electric, magnetic, and sonophoretic forces. Particle mass, temperature, and particle-fluid interactions can be calculated.

[0058] A geometric model is established to determine the shape and size of the measured field region, the arrangement of the electric field, the electrode size, and to set the frequency parameters of the electric field and the material properties of the fluid. In one embodiment,

[0059] Establish a geometric model to determine the shape and dimensions of the pipe, as well as the dimensions and material information of the electrodes, such as... Figure 1 A drain outlet is added to the existing inlet and outlet of the heat exchange pipes. Electrodes are installed on one side of the pipe between the inlet and the drain outlet to form the electric field treatment area. The electrodes are arranged in a 5mm alternating positive and negative array. The horizontal pipe is 200mm long and 20mm wide. The outlet and drain outlet have the same dimensions: 100mm long and 15mm wide. The outlet pipe is inclined at a 150° angle to the horizontal pipe. The material added inside the pipe is water with a conductivity of 80μs / m, a dielectric constant of 80, and a density of 1.07g / cm³. 3 The dynamic viscosity is 1×10 -3 Pa·s.

[0060] The electric field module completes the simulation of the electric field, including building electrodes on the pipe, applying electrode excitation conditions, establishing the electric field distribution of the fluid inside the pipe, and simulating the density and strength of the electric field lines generated by the electrodes inside the pipe.

[0061] The governing equations for the electric field module are:

[0062] The governing equations describing the electric field are Maxwell's equations.

[0063]

[0064]

[0065]

[0066] Where J is the current density, A / m 2 Q j，v As a current source, A / m 3 σ is the electrical conductivity, S / m; D is the electric flux, C / m 2 J e External current density, A / m 2 .

[0067] First, frequency domain analysis was performed using the electric field module. The equations of the electric field module were set as the control equations, and the displayed equations were set as Study 1, in the frequency domain. Boundary conditions for the measured field and excitation conditions for the electric field were set. The solution region was the entire geometric model, and the excitation condition was electric potential. Two potentials were set: a positive potential of 2200V and a negative potential of -2200V. The electrodes were arranged in a multi-electrode array, with each electrode having the same width and spacing, and alternating between positive and negative at any given time. The region was meshed and solved to complete the electric field simulation. The electric field distribution was obtained as follows: Figure 2 .

[0068] The laminar flow module is used to set the inlet and outlet of the fluid in the pipe, and the flow velocity of the fluid at different locations in the pipe is simulated. Steady-state analysis using the laminar flow module is then performed, boundary conditions are set, and a steady-state solution is obtained.

[0069] The module describes the governing equations for laminar two-phase fluid flow based on the Navier-Stokes equations:

[0070]

[0071]

[0072]

[0073] Where ρ is density, g / cm³ 3u is the flow velocity, m / s; p is the pressure, Pa; I is the pressure coefficient of this phase; K is the generalized momentum source phase; F is the volume force, N; T is the temperature, K.

[0074] Steady-state analysis was performed using the laminar flow module. The module's equations were set as the control equations, and the displayed equations were set as Study 1, steady state. Boundary conditions were set, the solution domain was the entire geometric model, the pipe wall condition was no slip, the right pipe wall was selected as the inlet, the inlet velocity direction was normal inflow, and the velocity was 0.2 m / s. The two left pipe walls were selected as the outlets, and the outlet boundary conditions were set as pressure, with static pressure and backflow suppressed. The steady-state solver was then used to solve the problem, obtaining the velocity distribution diagram within the pipe (see...). Figure 3 ).

[0075] Using transient analysis with the flow particle tracking module, set boundary conditions.

[0076] The forces acting on a single spherical dirt particle in the fluid in the model:

[0077]

[0078] Where m is the particle mass (μg); u c The velocity of the particle is denoted as ρ (m / s).

[0079] F D The drag force exerted on the particles by the fluid is expressed as:

[0080] F D =3πμd(u f -u c (8)

[0081] Where μ is the fluid viscosity (Pa·s); u f The fluid velocity is (m / s); u c The velocity of the particle is denoted as ρ (m / s).

[0082] Model-controlled particle motion equations

[0083]

[0084]

[0085] Where m p ρ is the particle mass, g; v is the velocity, m / s; F is the force, N; q is the particle position.

[0086] Transient analysis using the flow particle tracking module first sets the particle inlet and outlet, which are identical to those set in the laminar flow field. The inlet coordinate system is the global coordinate system, the particle release time distribution is set to a value list (0, 0.05, 2), and the particle conductivity is set to 1.26 × 10⁻⁶. -5 The particle size distribution is S / m, and the dielectric constant is 6.14. The initial release condition for particles is set to uniform distribution, with the initial velocity coupled to the laminar flow field. The outlet wall condition is set to freezing. Particles are subjected to drag force; the solution domain is the entire geometric model, the coordinate system is the global coordinate system, the drag force law is Stokes law, the velocity is coupled to the laminar flow field, and all particles are affected. Dielectrophoretic force is also applied under the influence of an electric field; the solution domain is the entire geometric model, with the coordinate system being the global coordinate system, the force is coupled to the current field, and all particles are affected.

[0087] The solver performs the calculations, setting up the solver and study steps. The laminar flow module for steady-state calculations and the electric field module for frequency domain calculations are set as Study 1. Within the steady-state calculation, only the laminar flow module is solved, and within the frequency domain calculation, only the electric field module is solved. The transient solution is set as Study 2. The transient solver only performs transient solutions for tracking flowing particles. The initial values ​​of the solved variables are set to physical field control, while the values ​​of the unsolved variables are set to user control. The method is "solution," the study is the frequency domain of Study 1, and both the solution and the user are set to the current state. The parameter values ​​are set to automatic. Finally, the Study 2 calculations are performed.

[0088] The electric field descaling simulation method based on multi-physics coupling of the present invention is mainly used to simulate the trajectory deviation of dirt particles excited by the dielectric force generated under the action of electric field, but it can also be applied to simulate other models that require current, laminar flow and fluid flow particle tracking modules.

[0089] This embodiment utilizes the coupling of current and laminar flow modules to simulate the generation of dielectric force, obtaining the displacement and other responses that occur when this dielectric force acts on dirt particles, without applying an electric field (see...). Figure 4 The trajectory of the particles is only affected by the drag force; dirt particles are present at both the clean water inlet and the sewage outlet of the pipe; when an electric field is applied (see...), the particle's trajectory is affected by the drag force. Figure 5 The trajectory of the particles changes, and they are all discharged from the drain outlet, thus providing a more realistic simulation. The design of a scale removal device based on electric field excitation is realized according to the simulation.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A design method for a descaling device based on multi-physics field coupled electric field, characterized in that, The simulation was performed using the electric field module, laminar flow module, and flow-particle tracking coupling module in the Comsol Multiphysics multiphysics simulation software, specifically including: Build a geometric model, and construct a pipe with one end as the inlet and the other end branching to form an outlet and a sewage outlet. A non-uniform electric field was simulated inside a pipe using an electric field module. By applying a fluid field inside the pipe using a laminar flow module, the coupled physical field of electric field and fluid field is obtained, thus completing the environment setup for the model. A certain number of particles are released at the inlet of the pipe using a flow particle tracking coupling module. The particles are subjected to the forces of fluid and electric field inside the pipe, and their motion trajectory is solved. By adjusting the parameters of the electric field module, laminar flow module, and flow particle tracking coupling module, different particle motion trajectories are simulated. The actual sewage discharge device is set according to the parameters of the electric field module, laminar flow module, and flow particle tracking coupling module corresponding to the required motion trajectory. The electric field module uses frequency domain analysis to set the boundary conditions of the measured field and the excitation conditions of the electric field, performs mesh generation on the region and solves the problem to complete the simulation of the electric field environment, wherein: The governing equations describing the electric field are Maxwell's equations: ， ， ， in Current density; It is a current source; Electrical conductivity; Electric flux; External current density; The laminar flow module describes the governing equations for laminar two-phase fluid flow: ， ， ， in Density; For flow rate; Pressure; The pressure coefficient of this phase; It is a generalized momentum source phase; It is a volume force; For temperature; The flow particle tracking module is configured to simulate the forces acting on a single spherical dirt particle in the fluid. ， in For particle mass; The velocity of the particles; The drag force exerted on the particles by the fluid is expressed as: ， in For fluid viscosity; For fluid velocity; The velocity of the particles; Particle motion equations: ， ， in For particle mass; For speed; For being subjected to force; This represents the particle's position.

2. The design method for a descaling device based on multi-physics field coupled electric field as described in claim 1, characterized in that, The electric field module performs electric field simulation, including constructing electrodes on the pipe, applying electrode excitation conditions, establishing the electric field distribution of the fluid inside the pipe, and simulating the density and strength of the electric field lines generated by the electrodes inside the pipe.

3. The design method for a descaling device based on multi-physics field coupled electric field as described in claim 1, characterized in that, The laminar flow module is used to set the inlet and outlet of the fluid in the pipeline and to simulate the flow velocity of the fluid at different locations in the pipeline.

4. The design method for a descaling device based on multi-physics field coupled electric field as described in claim 1, characterized in that, By using the flow particle tracking module to set the particle release inlet, release time, and release method, and combining the electric field-fluid field coupling physical field to obtain the fluid drag force and electric field force on the particle, the motion trajectory of the particle is obtained.

5. The design method for a descaling device based on multi-physics field coupled electric field as described in claim 1, characterized in that, In the frequency domain analysis using the electric field module, the governing equation of the electric field is set as the control for the study, and the boundary conditions of the measured field and the excitation conditions of the electric field are set. The solution region is the entire geometric model, and the excitation condition is the electric potential, which includes positive and negative electric potentials. The electrodes are arranged in a multi-electrode array, with each electrode having the same width and the same spacing, and alternating between positive and negative at the same time.

6. The design method for a descaling device based on multi-physics field coupled electric field as described in claim 1, characterized in that, The equations of the laminar flow module are set as the control for the study, boundary conditions are set, the solution domain is the entire geometric model, the pipe wall condition is no slip, the right pipe wall is selected as the inlet, the inlet velocity direction is normal flow, the two left pipe walls are selected as the outlet, the outlet boundary condition is set as pressure, the pressure condition is static pressure, and backflow is suppressed, and then the steady-state solver is used to solve the problem to obtain the velocity distribution map inside the pipe.

7. The design method for a descaling device based on multi-physics field coupled electric field as described in claim 1, characterized in that, Using the transient analysis of the flow particle tracking module, the particle inlet and outlet are set. The particle inlet and outlet are the same as the inlet and outlet of the laminar flow field. The inlet coordinate system is the global coordinate system. The particle release time distribution method is set to value list. The initial particle release condition is set to uniform distribution. The initial velocity is coupled with the laminar flow field. The outlet wall condition is set to frozen. The particles are subjected to drag force. The solution domain is the entire geometric model, the coordinate system is the global coordinate system, the drag force law is Stokes, the velocity is coupled with the laminar flow field, and all particles are affected. Dielectrophoretic force under the influence of an electric field is solved in the entire geometric model, where the coordinate system is the global coordinate system, the force is coupled with the current field, and all particles are affected.

Images