GROUP 8 REPORT TOPIC heating iron bars with heat

GROUP REPORT TOPIC: Heating Iron Bars With Heat Contents Global Definitions Parameters Model (mod1) Definitions Geometry Materials Induction Heating (ih) Mesh Study Frequency-Transient Results Data Sets Tables Plot Groups Introduction This is a simulation inspired by a high-rise kiln Here, we use induction coil and metal ingot to perform the simulation The heating process for the workpiece is based on the phenomenon of electromagnetic induction The current induced in the coil generates heat, and as the temperature increases, the conductivity of the copper wire also changes Heating caused by induced current is called induced heating One challenge in induction heating is that high currents in the induction coils require active cooling This can be achieved by emptying the coil conductors and circulating water inside Even for a rather modest flow rate, the coolant flow becomes highly turbulent making heat transfer between the conductor and the liquid very efficient This model illustrates a simplified water cooling model based on the assumption of turbulent flow and instantaneous mixing For mechanical support and electrical insulation, the cylinder and coil are embedded with FR4 composite material Model Definition The system to be solved is given by jωσ( T )A + ∇×( μ ∇ × A) = ∇ ∇ -1 where ρ is the density, Cp is the specific heat capacity, k is the thermal conductivity, and Q is the inductive heating The electric conductivity of copper, σ, is given by the expression σ¿ [ ρo (1+α ( T −T o))] Where ρois the resistivity at the reference temperature To = 293 K, α is the temperature coefficient of the resistivity, and T is the actual temperature in the domain The time average of the inductive heating over one period, is given by Q= 2 σ|E| The coil conductor is cooled by a turbulent water flow in an internal cooling channel This is emulated by a combination of a high effective thermal conductivity and a homogenized out-of-plane convective loss term: dM C p Q = dt πrA c where (T ¿−T ) dM dt is the water mass flow, Tin is the water inlet temperature, r is the radial coordinate and A is the cross-section area of the cooling channel Global Definitions Parameters Parameters Name Expression I0 2e3[A] T0 293[K] r0 1.754e-8[ohm alpha 0.0039[1/K] Rc 5[mm] Ac pi*Rc^2 Mt 1[kg/min] Tin 10[degC] Model (mod1) Definitions Coordinate Systems Boundary System Coordinate system type Identifier Geometry Geometry units Length unit m Angular unit deg Materials FR4 (Circuit Board) FR4 (Circuit Board) Selection Geometric entity level Selection Copper Copper Selection Geometric entity level Selection Water, liquid Water, liquid Selection Geometric entity level Selection Domain Domain Induction Heating (ih) Induction Heating Features Induction Heating Model Electromagnetic Heat Source Boundary Electromagnetic Heat Source Axial Symmetry Magnetic Insulation Thermal Insulation Initial Values Induction Heating Model 10 Induction Heating Model Single-Turn Coil Domain Temperature Heat Source Mesh Mesh 11 Study Frequency-Transient Mesh selection Geometry Mesh Geometry (geom1) mesh1 Physics selection Physics Discretization Induction Heating (ih) 12 Results Data Sets Solution Geometric entity level Revolution 2D Data Name Value Revolution layer Start angle Revolution Cut Point 2D Data Name Value Cut Point 2D Data 13 Cut Plane Name Data set Data Value Revolution 2D Plane data Name Value Plane type General Advanced Name Value Space variables Tables Evaluation 2D Interactive 2D values Evaluation 3D Interactive 3D values {cpl1x, cpl1y} 14 x y z Value Plot Groups Temperature, 3D (ih) Time=6000 Surface: Temperature (degC) 1D Plot Group Point Graph: Temperature (K) Point Graph: Temperature (K) 15 2D Plot Group Time=36000 Surface: Temperature (K) 2D Plot Group Contour: Temperature (K) Surface: Temperature (K) 16 ... level Selection Domain Domain Induction Heating (ih) Induction Heating Features Induction Heating Model Electromagnetic Heat Source Boundary Electromagnetic Heat Source Axial Symmetry Magnetic Insulation... increases, the conductivity of the copper wire also changes Heating caused by induced current is called induced heating One challenge in induction heating is that high currents in the induction coils... Magnetic Insulation Thermal Insulation Initial Values Induction Heating Model 10 Induction Heating Model Single-Turn Coil Domain Temperature Heat Source Mesh Mesh 11 Study Frequency-Transient Mesh selection