Comsol conduction heat transfer example 39 heat loss from an. Since vavb it is a loss rate of potential energy losspower dissipated in conductor. There are also many new functions and additions to the comsol product suite. The pressure and the velocity field are the solution of the navierstokes equations. The layer results in joule heating when a voltage is. Note that while comsol employees may participate in the discussion forum. As with all blogs, the best way to communicate the feature is to show it. Or you are thinking of heating by conductionconvection. Using the geometry and electrical resistance of those components, flow simulation will calculate the heat generated by those parts. Any help at all is greatly appreciated as i am still quite a novice comsol user. This is a multiphysics model because it involves fluid dynamics coupled with heat transfer. Im also still not sure if its actually possible to use the rf module as a heating source either. I have the joule heating physics and i have been able to successfuly simulate the temperature on the line with a direct current.
By combining the heat transfer module with other addons from the comsol product suite, you can create advanced heat transfer simulations. Apply voltage through electrical fiber that causes joule heating. Joule heating in a fuse on a circuit board, chapter 1 comsol. Comsol requires that every type of simulation included in the package has the ability to be combined with any other. Experiment 6 joule heating of a resistor introduction. Jul 12, 2012 after their meeting this is what he said, unfortunately the solidworks guy told me that there isnt much out there on using the joule heating condition. Jmags jsol solution was applied to the electromagnetic design to compute the joule heat loss.
Despite the fact that it has units of power, it is commonly referred to as joule heat. The busbar is made of copper while the bolts are made. This coefficient may be either positive corresponding to cooling or negative heating. This week, well go through a thermal actuator example which uses joule heating, thermal expansion multiphysics. The model couples the physics phenomena involved in one way only. Given the importance of understanding how joule heating can affect everyones designs and its intrin sic multiphysics nature, comsol decided to adopt bus bars as an example to help users learn the soft ware, grasp the simulation work flow, and understand multiphysics. Electric power and joule heating as a charge moves from a to b, the change in electric potential energy is. Some applications such as fuses, floor heaters, heat lamps, and window defrosters rely on joule heating for their operation. A couple of applications that do rely on joule heating include hot plates directly and microvalves for fluid control indirectly, through thermal expansion. Certain characteristics of comsol become apparent with use. Chapter 2 in our 3part video series details how to add physics and solve the model.
Joule heating is the generation of heat by passing an electric current through a metal. Ive used the joule heating similar to the tutorial model in comsol, but id like to get results with the rf module as well. This example describes an array of heating tubes submerged in a vessel with fluid flow entering at the bottom. Joule heating in a surface mounted package classic knownheatsource thermal analysis power, current or voltage input can. Joule heating is a classic multiphysics coupling in engineering and science. This is because the higher voltage used in europe 380 v vs 230 v. Introduction to comsol multiphysics 19982012 comsol protected by u. The device in this tutorial example consists of an electrically resistive layer deposited on a glass plate. This problem is a system of two coupled partial differential equations on the.
Joule heating is a synonym for resistive heating or ohmic heating. Joule heating of an alternate current comsol multiphysics. Honestly, it looks like how you are using joule heating is the proper way to use it. In these tutorials, linus andersson from the global technical support team here at comsol will show you how to couple the direct current electrical current in a fuse on a circuit board to the heat transfer in it and the surrounding system. In other applications including bus bars and highpower printed circuit boards joule heating is an inevitable side effect that must be predicted and managed if the product is to perform reliably. In chapter 1 you will see how to build the model and add materials in comsol multiphysics.
The model also requires either the mems module or structural mechanics module. This archived webinar provides an overview of simulating joule heating with comsol multiphysics. Electromagnetics modeling in comsol multiphysics the acdc and rf modules. Joule heating, also known as resistive heating or ohmic heating, is one of the classic multiphysics couplings in science and engineering. The temperature change produced during a joulethomson expansion is quantified by the joulethomson coefficient. My objective is to evaluate the joule heating effect on the ic pins due to the injection of electirc current pulse. Dec 23, 2016 solving heat conduction example 39 of heat and mass transfer fundamentals and applications 8th edition using comsol. Joule heating, also known as resistive, resistance, or ohmic heating, is the process by which the passage of an electric current through a conductor produces heat joules first law, also known as the joulelenz law, states that the power of heating generated by an electrical conductor is proportional to the product of its resistance and the square of the current. The layer results in joule heating when a voltage is applied to the circuit, which results in a structural deformation. A few examples of where this occurs includes conductors in fuses, electronics, power lines, and electric heaters. Can someone explain with math how transmitting power at higher voltages reduces resistive loss. Analyze heat transfer by conduction, convection, and radiation with the heat transfer module, an addon product to the comsol multiphysics platform. Note that most conditions in the figure correspond to n 2 being a supercritical fluid, where it has. The primary inputs are current, voltage, and the material resistivity.
The busbar electrical heating in a busbar in order to get acquainted with comsol multiphysics, it is best to work through a basic example step by step. The what, why and how of simulating joule heating mdx. Figure 6 shows the acdc interfaces as well as those under the heat transfer branch, which contains the joule heating and induction heating interfaces. The thermalelectric multiphysics capability in abaqus provides a complete fullycoupled capability including nonlinear effects in material properties in both the electrical and thermal physics components. I think because it is a very small part of the software. Introducing heat transfer modeling software from comsol. Then youd like to heat the system by joule heating. The possible multiphysics phenomena include thermal contact, nonisothermal turbulent flow, heat transfer in porous media, joule heating, microwave heating, and laser heating. The predefined interfaces include joule heating, induction heating, microwave heating, and laser heating.
Chapter 1 introduces various techniques to obtain nanoscale temperature distribution. This simple tutorial model simulates the resistive heatingalso known as joule heating of a twohotarm thermal actuator. Problem about joule heating and thermal expansion comsol. Induction heating process design using comsol multiphysics. Thermal actuator parameterized comsol multiphysics. Multiphysics modeling of resistive heating in an aluminum fuse. Hello, i am trying to simulate what happens to the temperature of a transmission line that has an alternate current flowing through it.
Accurate simulation of many products now requires a multiphysics approach. Joule heating in a fuse on a circuit board tutorial, chapter 1. Joule heating in a fuse on a circuit board, chapter 2 comsol. Joule heating in a fuse on a circuit board tutorial, chapter 2. We use the same notations as in comsol multiphysics. The comsol multiphysics approach starts with first principles like transport phenomena, electromagnetic field theory, and solid mechanics as the basic fibers of the. Joule heating of a microactuator thermalactuatorjh. For users of the acdc module, comsol multiphysics version 5. Jules heating law, resistive heating, ohmic heating explained. Now start comsol multiphysics using the matlab7 comsol icon followed by comsol. Video tutorial on how to model joule heating in comsol. The layers properties determine the amount of heat produced. Modeling joule heating in a thermal microactuator with the comsol software.
In some cases, joule heating is pertinent to an electrical devices design, while in others, it is an unwanted effect. How meshing and computing problems in comsol can be solved in this spesific example. Solving heat conduction example 39 of heat and mass transfer fundamentals and applications 8th edition using comsol. Joules first law and heat transfer introduction in this experiment heat is produced by passing a current through a resistor which is immeresed in a container of water. Joules law describes joule heating or ohmic heating or resistive heating. Find out how to add physics and solve the model in comsol.
Reasonable result can be obtained when using stationary solver. The heat transfer module includes a comprehensive set of features for investigating thermal designs and effects of heat loads. Veryst is a comsol certified consultant, and we use comsol multiphysics in a wide variety of applications and industries, combining the physical processes of fluid flow, stress analysis, heat transfer, nonlinear materials, contact, vaporization and condensation, acoustics, microwave heating, gas dynamics, and mixing. The joule heating multiphysics interface couples the heat transfer in solids interface with electric currents acdc module. I tried using joule heating and thermal expansion physics and frequency domain solver in comsol 4. Multiphysics modeling of joule heating in an aluminum fuse on a circuit board.
The example consists of a substrate and a microactuator. With a multiphysics capable simulation tool, you can correctly capture the important aspects of your design. Also referred to as ohmic or resistive heating, joule heating commonly affects material properties, such as electrical conductivity. The purpose of this experiment is to compare the energy dissipated by the resistor to that absorbed by the water, thereby testing the principle of conservation of energy. The application gallery features comsol multiphysics. For example, in the us a polemounted transformer in a suburban setting may supply houses, whereas in the uk a typical urban or suburban lowvoltage substation might be rated at 2 mw and supply a whole neighborhood. Preset studies are studies that have solver and equation settings adapted to the selected physics, in this example, joule heating. The heat which is produced due to the flow of current within an electric wire, is expressed in unit of joules. How to convert joule heat to temperature, any hint. It considers heating due to conduction currents and dielectric loss. In comsol, we are trying to use joule heating module for our graduate research. Ive used comsol for engineering for low frequency magnetic designs aka electromagnets involving heat transfer of electrical joule heating and magnetic field caused magnetostriction and mechanical statics upon that stressstrain. This multiphysics example simulates the electrical heat generation, heat transfer, and mechanical stresses and deformations of a heating circuit device.
Adding electromagnetic effects to a multiphysics analysis. The power p absorbed in an electrical resistor of resistance r, current i, and voltage v is given by p i2r v2r vi. The comsol simulations drove ab initio product engineering and design. Familiar examples are heating of conductors in electronics, power lines, fuses, and electric heaters. Also known as resistance heating, this function simulates heating due to electrical resistance. Choose 2d, comsol multiphysics, electrothermal interaction, and jouleheating, then ok. Chapter 1 in our 3part video series details how to build the model and add materials. Note that you can change which equation you work with conductive media or heat transfer in the model tree to the left or under. The acdc module has several acdc interfaces for different types of electric and magnetic modeling.
Below is an example of mechanical stress induced in a heating circuit by way of joule heating. Now the mathematical representation and explanation of joules law is given in the following manner. In chapter 2, joule heating and thermoelectric heating in 1st harmonic and 2nd harmonic signals are analyzed by comparing the terms in governing equations and simulation results. Veryst engineering specializes in multiphysics problems involving solids, fluids, heat transfer, mass transfer, acoustics, and electromagnetics. Tutorial model of a heating circuit comsol multiphysics. Using the rf module and coupling it with the bioheat.
Excerpt from the proceedings of the 2012 comsol conference in boston. How meshing and computing problems in comsol can be solved in. Electromagnetics modeling in comsol rf module highfrequency modeling. This allows a full range of joule heating capabilities to be simulated within the familiar abaqus environment. Browse all of the acdc module updates in more detail below. Comsol conduction heat transfer example 39 heat loss from. In comsol, there are some tutorial on electrochemical and dcac problems. Img workshop introduction to python for research part 1 thursday, april 16, 2020 4. However, as explained below, you can easily modify it to simulate a twoway coupling between the electric current and the heating of the actuator. Overview of simulating joule heating with comsol software. Joule heating adds the ability to run power through electronic components.
Power companies transmit electricity at high voltages and low currents on power lines to minimize power losses despite higher risk. Analyze thermal effects with the heat transfer module comsol. Also see physics interface guide by space 11 dimension and study type. In this model version, only the currents and temperatures are computed, while the deformation is ignored. This enables you to couple the physics describing your electrodeposition or etching process to other modules, such as the heat transfer module for studying thermal. Performing a multiphysics analysis of a thermal microactuator. Our modeling and analysis expertise includes fluidstructure interaction, thermalstructure interaction, structuralacoustic vibrations, conjugate heat transfer, joule heating. These instructio ns describe the essential components of. Mar 08, 2019 lets take a look at a thermal microactuator model built using the comsol multiphysics software. Excessive heating can result in failure of the device, so modeling with lab. Capacitors ion optics and charged joule heating and induction heating particle tracing. Joule heating induction heating requires the acdc module microwave heating requires the rf module laser heating requires the wave optics module thermal stress requires the structural mechanics or mems module.
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