Simulation Electrical Heating Forehearth by Plate Electrodes
Figure 1: CAD created in NOGRID's COMPASS
Figure 2: Electrical potential in the GUI
Figure 3: Electrical current density
Figure 4: Electrical power density
Figure 5: Fluid velocity field including velocity vectors
Figure 6: Temperature distribution including electrical current field vectors
Figure 7: Animation temperature distribution over time
If you want to compute a thermal analysis of electrically heated channel flow by plate electrodes (simulation electrical heating forehearth by plate electrodes) you can use the simulation software NOGRID points. Based on the geometrical model which can either be imported from your CAD or created with our CAD preprocessor COMPASS you can generate a computer model of a specific geometry in a very short time (compared to mesh-based methods) and see its thermal characteristics in advance.
The fluid in this tube or closed channel flow is heated by two opposing plate electrodes. The plate electrodes are not computed as solids here, so the electrical potential is applied to the shell of the plate electrodes. A certain temperature distribution in the fluid is set by the electrical resistance in the fluid, depending on the flow rate and the size and arrangement of the plate electrodes.
The following equation is used within NOGRID points to solve the electrical potential u in liquids and solids:
u electrical potential u = u (x, y, z)
σ electrical heat conductivity
q source term
In the field of electrostatics, the electrical potential does not change with time and the valid differential equation for the electrical potential u is the Poisson equation
Conduction in solids and liquids is described by Ohm's law, which states that current is proportional to the applied electric field. The current density (current per unit area) j in an area is directly proportional to the electric field E and the proportionality factor is the electric conductivity σ:
The electric field E can be calculated directly from the electric potential u by
In this simulation, the Navier-Stokes equations together with the temperature equation and the Poission equation for electrical potential are computed. The temperature in the flow is influenced by the magnitude of the electrical current, the arrangement of the plate electrodes and the temperature-dependent electrical resistance of the fluid. If, for example, the viscosity of the fluid depends on the temperature, the temperature distribution naturally has a direct influence on the flow in the channel. If the electrical conductivity of the fluid also depends on the temperature, the electrical power distribution is also influenced by the flow.
NOGRID points helps to understand the flow by visualization of the mass, momentum and heat transfer of single and multiple phases. You receive integral quantities which you can use to analyze the heat exchange efficiency. NOGRID unites abilities to handle free surface flow and moving parts in the domain and allows the simulation of any conceivable geometry and operation modes such as
- computation is in full 3D solving complete Navier-Stokes-Equations
- easy and intuitive setup also for FSI (Fluid-Structure-Interaction) cases
- free definable material properties by equations or curves
- coupled solutions for electrical heating and fluid mechanic cases
- open or closed domains including inflow and outflow areas (non-batch mode)
- moving of parts and flexible thermal contact behaviour
Nogrid's strengths
Easy and fast modelling: Build geometry, mesh boundary, setup the case and start computation
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CFD solves the fundamental equations that define the fluid flow process. With CFD software from NOGRID every engineer makes better decisions by predicting, analyzing and controlling fluid flow, heat and mass transfer or chemical reaction. By using NOGRID software for flow modeling you receive information on essential flow characteristics as for example flow distribution. Using it additional to testing and experimentation NOGRID software helps to improve the evaluation of your design – resulting in better construction and operation parameters, increasing planning security and money savings due to faster time to the marketplace for your product or process.
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