Hi Yeal For users of the Battery Design Module, COMSOL Multiphysics version 6.1 introduces a new interface for modeling multiple batteries, the ability to simulate heat transfer in battery layers, and the addition of the Parameter Estimation study step. You just need to add the volumetric heat source to fluid and solid domains separately. Hence the Q variable (or q0_htgh internally) enters directly thermal power onto the boundary, while the "h" is proportional to the temperature difference (in K) of (Tinf-T) and T is the temperature you are solving for, so Tinf yould be your constant blood temperature, then h should be scaled to take into account the liquid solid exchange, but perhaps next step to take into account the blood flow, or total volume passing through, as the blood temperature might not manage to take/give all the heat, unaffected, if you have a sever feber, but I would propose not to use non-linear terms to start with. Animation of the temperature distribution as the prescribed temperature spot travels along the bar. Is there a way to go about this? you should have a look, it's excellent for your type of activities (I just got it a week ago) You agree not to post or link to any material that is abusive, obscene, vulgar, slanderous, hateful, threatening, sexually oriented, or that infringes upon or violates any third-party rights or any other material that may violate any applicable laws. If you want to add heat flux on internal boundary you can use boundary heat source node." It worked for me. [/QUOTE] my model is solid with heat flux on the upper face and fluid moving under the lower face , I used Conjugate heat transfer is this right to assign heat fkux and temperature for the same surface? To start a new discussion with a link back to this one, click here. My model is similar to the tutorial here. Version 5.1 However, in my version, this option is not available (second photo attached). This is to avoid the heat wave reflecting at the boundary and contributing to the temperature rise. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version Please login with a confirmed email address before reporting spam . That boundary condition accounts directly for heat loss from the solid through conduction and the fluid flow that results accounts for convection. All content is provided "as is" without warranty of any kind, express or implied, including without limitation, warranties of merchantability, noninfringement, design, operation, and fitness for a particular purpose, and the entire risk as to the quality and performance of the programs is with you. It works well, except for the boundary conditions. The basic heat transfer in two solids of material iron. much better if you upload your file for the other members to comment and have their suggestions. There is no need for a different thermal boundary condition there. If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base. . Neither COMSOL, the authors, nor the copyright owners of submitted materials warrant that the programs will be error-free, uninterrupted, virus-free, secure, and suitable for your needs, produce specific results, or that errors or failures will be corrected. The pipe was settled vertically . Thanks. Send Private Message Flag post as spam. Jonathan Perez. The simulation for the heat transfer is quiet good but the not in the mass transport. Try to catch typos. listed if standards is not an option). Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. It works well, except for the boundary conditions. Heat Transfer Boundary Condition. 3 Replies, Please login with a confirmed email address before reporting spam. Heat Transfer & Phase Change www.comsol.com/community/forums/general/thread/34647/, Calculating the Heat Transfer Coefficient for Flat and Corrugated Plates, Heat source for conjugate heat transfer model, Can the convective heat transfer at the solid-liquid interface be obtained during convective heat transfer, Solving Models with Step Changes to Loads in Time. Heat Transfer & Phase Change Here are some important guidelines of language: By submitting content to the forums, you hereby grant COMSOL a nonexclusive, royalty-free, perpetual, worldwide, and unrestricted license to reproduce, publicly display, publicly distribute, and prepare derivative works of the content. Hence the Q variable or q0_htgh internally enters directly thermal power onto the boundary, while the "h" is proportional to the temperature difference in K of Tinf-T and T is the temperature you are solving for, so Tinf yould be your constant blood temperature, then h should be . please help me Veryst Engineering For example, you may have a tube in which the helium will flow through and inside that tube you will have your heated metal bar. COMSOL provides the forum service for the benefit of our users to share content with the community. The time-dependent solver result (for your reference) is attached herewith. The data agrees with the Sherwood and Blasius correlations, however. Cheers Hence the Q variable (or q0_htgh internally) enters directly thermal power onto the boundary, while the "h" is proportional to the temperature difference (in K) of (Tinf-T) and T is the temperature you are solving for, so Tinf yould be your constant blood temperature, then h should be scaled to take into account . But , results shows exactly opposite. Whilst the heat source is active the model heats, then it holds at the max temperature instead of dissipating the heat. You also agree to maintain the accuracy of all information associated with you on your COMSOL Access account. Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. you can use infinite elements. This periodicity can be continuous (the default) or anti-periodic and can control which of the dependent variables that the. Capitalize correctly. hello. However, there are some important situations where this is not the case, and an Inflow boundary condition can improve the model accuracy and reduce . Thank you very much in advance. Maybe there are some issues on the type of mesh that I am using. What I would like to inquire right now is the problem on the heat loss due to evaporation. You agree to maintain your COMSOL Access account for use solely by you, not to share your username and password with anyone else, and to take appropriate precautions to restrict access to your username and password from others. March 15, 2018. COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH), Using the Inflow Boundary Condition in Nonisothermal Flow Simulations, Modeling Natural and Forced Convection in COMSOL Multiphysics, Derivative Boundary conditions for heat and mass transfer, How to Make Boundary Conditions Conditional in Your Simulation. Please check to see if a topic has already been posted. Does the nitf node of COMSOL account for this loss? In the tutorial (@ 11:49) the narrator assigns a "Surface-to-Ambient Radiation" boundary condition on the outer surface of the model (screen shot attached). Boundary conditions in heat transfer. I think I am mis-using a boundary condition but I am not sure. The Periodic Condition node adds a periodic boundary condition. Enabling the Equation View.. It worked well when there is only bioheat physics, but when i use . Posted Dec 21, 2009, 2:36 p.m. EST listed if standards is not an option). COMSOL imposes temperature continuity at the fluid-structure boundary in a conjugate heat transfer problem. Now to understand how COMSOL isusing these and how they are related (Tinf is only linked to "h") take a look at the equations: That boundary condition accounts directly for heat loss from the solid through conduction and the fluid flow that results accounts for convection. That boundary condition accounts directly for heat loss from the solid through conduction and the fluid flow that results accounts for convection. Check the application library model in Heat Tranfer Module > Tutorials Conduction > carbon_fibers_infinite_elements to learn how it works. I am somewhere stuck up in meshing part, thus, request you to please reply. We investigated the dynamics of nanofluid and heat transfer in a three-dimensional circular annular using the turbulence model and energy equations. My model is similar to the tutorial here. I should get a maximum temperature in the fluid domain not in the solid domain because of higher light absorption characteristic of fluid. What does it mean? If you are familiar with LaTeX, please use this to write mathematical equations. You might have found out by now, I hope so, but in anycase, in the boundary condition Heat flux you have 2 variables Q and h, you might either choose one or the other, or both. This involves providing you with access to technical support and downloads of the latest {:comsol} software releases, as well as the ability to share your comments and work with other users of the {:comsol} software through forums such as the blog, discussion forum, and Application Exchange. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. However, in my version, this option is . listed if standards is not an option). Use correct punctuation. Hi, can I give a absorbing boundary condition for a transient heat transfer problem. Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. Try to avoid using text speak, net speak, or slang. Because I want to consider the heat loss, I tried adding the convective cooling. Thermal Connectors Between Shells and Domains. You represent and warrant that you are not subject to any comprehensive sanction or embargo by the U.S. or any other country, nor are you identified on any list maintained by the U.S. government that identifies persons for which the U.S. maintains restrictions. However, in my problem the solid is under laser heating (consider as a volumetric heat generation based on Beer-Lambert law)in which i am defining optical properties for solid as well as for fluid such that fluid light absorption characteristic is greater than that of solid.
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