For downflow and upflow we use heat transfer in fluids, for the ground heat transfer in porous media. Whenever we have a heated or cooled part exposed to air, there is some transfer of heat from the part to the air via convection. Here, we present comsol simulations for miscible vf in homogeneous porous media of both types. Apr 28, 2017 whenever we have a heated or cooled part exposed to air, there is some transfer of heat from the part to the air via convection. Microfluidics software for simulating microfluidics devices. The physics interfaces, options, and functions are tailored to account for subsurface. The possible multiphysics phenomena include thermal contact, nonisothermal turbulent flow, heat transfer in porous media, joule heating, microwave heating, and laser heating. I discovered that it is enough to put the same name of parameters in both physicals u,v,w,p, but the speed is still not continuous. Problem definition in this tutorial we show a very easy example how to solve fluid flow in porous media with quickersim toolbox for matlab.
This course is designed for existing users of ansys fluent. Comsol modelling, porous media, breathable films, thermal. Comsol, the comsol logo, comsol multiphysics, comsol desktop, comsol server, and. Modelling and simulation of hydrogen storage device for fuel cell using comsol. Modeling of flow and heat transfer in rotating porous media is introduced in this chapter. Evaporation in porous media is an important process in the food and paper industries, among others. This thesis used the study of heat transfer and comsol multiphysics software as a reference which was made for the purpose of future education in engineering field.
Coupled fluid flow and thermal and reactive transport in porous. Uber comsol multiphysics modellierungsbeispiele zum. Feature nodes for the heat transfer in porous media interface. You can select different averaging models to define effective heat transfer properties that are automatically calculated from the respective properties of. Comsol cfd with porous media cfd online discussion forums.
We walk you through performing different types of porous media simulations. We are motivated to model a heat transfer to a multiple layer regime and their optimization for heat energy resources. Introducing heat transfer modeling software from comsol. The components are coupled in various ways by extrusions, which are sketched in figure 2. A catalytic bed reactor with an injection needle is simulated and improved upon, using the reacting flow in. Comsol multiphysics model makes it possible to determine the temperature distribution on the outer surface of the bulb, as well as the temperature and pressure distributions within the bulb. Flow in porous media, heat transfer in and between porous media and gas. Assumption thermal equilibrium between the hydrogen gas and. Free convection in a light bulb comsol multiphysics. Heat transfer modeling software for analyzing thermal effects. Heat transfer temperature thermal and velocity rainbow plot heat transfer in solids and fluids heat transfer in porous media extended version in subsurface flow module add up to 5 different immobile fluids geothermal heating thermal dispersion multiphysics darcys law, richards or brinkman equations. Heat transfer and nonisothermal flow interfaces modeling heat transfer in the cfd module 224.
Porescale modeling of nonisothermal two phase flow in 2d. With the simulation software comsol multiphysics, a 2d cross section of a horizontal agf project figure 2a is selected and a numerical model is set up, which is based on full coupling of temperature and flow fields by combining physical interfaces of darcys law and heat transfer in porous media. Earth science module of comsol multiphysics is applied. With the robust interfaces in the heat transfer module, you can simulate heat transfer through porous media and account for the conduction and convection in the porous matrixs solid and openpore phases. This book, heat and mass transfer in porous media, presents a set of new developments in the field of basic and applied research work on the physical and chemical aspects of heat and mass transfer phenomena in a porous medium domain, as well as related material properties and their measurements. Basic heat transfer in a metal beam in comsol youtube.
This thesis details the process taken for the computational modelling of convective heat transfer in porous media with the objective of improving the accuracy of porous continuum models. When you use this model, you define a cell zone in which the porous media model is applied and the. This approach was used to address nonisothermal immiscible wateroil displacements in porous media. This is a multiphysics model because it involves fluid dynamics coupled with heat transfer. If you are reading the documentation as a pdf file on your computer. About using the transport of diluted species in porous media. Simulation of heat transfer during artificial ground freezing. The coupled cahnhilliard phase field and heat transfer equations were solved by finite element method with an interfacial adaptive mesh refinement.
Moreover, steady incompressible and laminar fluid flow and steady heat transfer, with negligible radiative heat transfer and constant solid and fluid property have been assumed in computations. Multiphysics modeling of heat and mass transfer in porous media. Porous media flow module updates comsol multiphysics. The aim of the present work is to implement in comsol multiphysics a multiphase fluid flow model in porous media, also known in the oil reservoir engineering literature as a black oil model, using. Learn how to model porous media flow and chemical reaction in comsol multiphysics. This example models the effects of heat transfer with phase change and local thermal nonequilibrium while charging the tes unit. The movement of the air can be either forced, via a fan, or free, as a result of the natural buoyancy variations due to changes in the air temperature. The heat transfer in porous media interface 298 feature nodes for the heat transfer in porous media interface. Titled the heat transfer module users guide, it introduces you to the basic functionality in the module, covers basic modeling techniques, and includes reference material of interest to those working with problems involving heat transfer.
In order to show the capability of comsol multiphysics by handling transient three dimensional problems, the simulation of a beamend is given as example. A novel approach to multiphysics modeling of heat and mass. The fluid flow and the heat transfer analysis is run fully coupled with the thermodynamic and transport property functions. In this archived webinar, learn how to use comsol multiphysics to model heat transfer in porous media. The governing equations are presented and transformed into dimensionless form in order, among others, to identifying conditions for neglecting terms in these equations. In porous materials the sound propagates in a network of small interconnected pores. Coupled fluid flow and thermal and reactive transport. This example treats the modeling of subsurface flow where free convection in porous media is analyzed. Great listed sites have comsol heat transfer tutorial. Heat transfer in fluids and solids laminar and turbulent flow compressible flow for.
Based upon the finite element method, comsol is designed from the. Heat transfer modeling for thermal stimulation of near. All of these effects are strongly coupled and predefined interfaces can be used to model these effects with the heat transfer. The flow is often frictiondominated when the pore size is in the micron range and darcys law can be used. The heat transfer module users guide comsol documentation. Mflow defines the mass flow through the outlet boundary, where we can divide by the constant density.
Following the steps given in the documentation of the comsol heat conduction in a slab tutorial see next page. Modeling heat transfer in porous media using comsol. Computing porosity and permeability in porous media with a. Pdf comsol implementation of a multiphase fluid flow. The results are compared with published literature in the field.
Evaporation in porous media with large evaporation rates. For users of the heat transfer module, comsol multiphysics version 5. Comsol is the developer of comsol multiphysics software, an interactive environment for modeling and simulating scientific and engineering problems. Pdf comsol implementation of a multiphase fluid flow model. Geiser1 1ema university of greifswald, institute of physics, felixhausdorffstr. Modelling and simulation of hydrogen storage device for. This interface remains unique in its coupling with the electrochemistry interfaces for the modeling of porous electrodes. Model porous media flow and chemical reaction in comsol. Femlab heat transfer tutorial rev rowan university. You will learn and achieve an understanding of the basic theory of the models and computational methods for heat transfer applications. We use brinkman equation for modeling in the porous media, wherever darcys law is not applicable. With the robust interfaces in the heat transfer module, you can simulate heat transfer through porous media and account for the conduction and convection in the porous matrixs solid.
Comsol, the comsol logo, comsol multiphysics, capture the concept, comsol desktop. The amount of studies conducted on heat and mass transfer in porous media has increased. The model couples the momentum balance to an energy balance through an equation, dependent on temperature, being directly typed into the source term for the momentum balance. Learn about these heat transfer features and more below. The cooling fluid flowing in channels is diluted electrolyte liquefied of kcl that enters the channels with 20. Heat transfer interfaces the mechanisms for heat transfer 240. Pdf comsol multiphysics modeling in darcian and non. Evaporation in porous media with large evaporation rates evaporation in porous media is an important process in the food and paper industries, among others. The heat transfer module has robust interfaces for modeling heat transfer in porous media, accounting for both conduction and convection in solid and open pore phases of the porous matrix. Governing equations and use of comsol multiphysics.
Comsol support team for helping me with the software related queries. Free convection in a porous medium comsol multiphysics. Applications of comsol multiphysics software to heat transfer processes supervisor. Flow through porous media can also occur on microscale geometries. With the new version of the free and porous media flow interface, you can couple laminar or turbulent free flow with porous media flow. Isothermal flow and conjugate heat transfer heat transfer in fluids and solids laminar and turbulent flow compressible flow for o0. Mathematical modelling of heat and mass transport in the porous media have been. Id like to solve all the parameters continuously, in particular the speed and pressure. Nov 10, 2014 learn how to model porous media flow and chemical reaction in comsol multiphysics. Modelling mass and heat transfer in a porous structure.
Acoustic foams are used to sound proof rooms and ducts as well as to treat reverberation problems in rooms. Finite element method fem is applied, mesh size of the 2d fundamental numerical model is autorefined and grows outward from the fracture to the porous media. Heat transfer by free convection this example describes an array of heating tubes submerged in a vessel with fluid flow entering at the bottom. Warning your internet explorer is in compatibility mode and may not be displaying the website correctly. The method was validated by simulating a nonisothermal poiseuille twophase flow in channel.
The microfluidics module features a dedicated physics interface for porous media flow based on darcys law. It shows the coupling of heat transport conduction, radiation and convection to momentum transport nonisothermal flow induced by density variations caused by temperature. Submit a plot similar to figure 52 in the documentation. Particle tracing and heat transfer in porous media is studied in short. Modeling natural and forced convection in comsol multiphysics. Heat transfer in borehole heat exchangers from laminar to. Exampleeffective diffusivity in porous materials 58. Because the dimensions of the pores are small, losses occur due to thermal conduction and viscous friction. By combining the heat transfer module with other addons from the comsol product suite, you can create advanced heat transfer simulations. Two physics interfaces were used to describe the problem. Cfd simulations were performed to predict convective heat transfer resulting.
1043 635 798 657 25 1046 1458 1068 345 311 1122 1029 1047 1509 1438 1393 818 1579 1432 1571 209 269 511 1463 1211 211 624 581 485 21 424 390 594 127 825 104 1411 1370 443 988 313 11 1246 25 473 1316 401 479