Heat Transfer Fundamentals with ANSYS Mechanical
Introduction
Welcome to our webinar on heat transfer. Today, we will discuss how to perform heat transfer simulations using ANSYS software products. Before diving into the technical details, let's briefly introduce Ozen Engineering, Inc.
We are a simulation company and the ANSYS distributor in California and Nevada. We provide all ANSYS products, including fluid structures, electronics, optics, and a virtual reality product for simulation and design. Additionally, we offer cloud services.
Theory of Heat Transfer
The governing equation for a linear system in heat transfer is:
- Specific heat matrix times the derivative of temperature with respect to time plus the conductivity matrix times temperature equals the heat loads on the right-hand side.
For a steady-state problem, we only solve the right-hand side. In transient problems, specific heat and density must be specified. Nonlinearity arises when:
- Thermal conductivity is temperature-dependent.
- Heat loads are a function of temperature.
- Specific heat matrix is temperature-dependent.
- Radiative heat transfer is included, as it involves temperatures raised to the fourth power.
ANSYS Workbench Environment
In ANSYS Workbench, the left-hand side is the toolbox, which contains:
- Analysis Systems: Different physics such as explicit dynamics, fluid flow, and electromagnetic problems.
- Component Systems: Functions like bringing in external models and advanced post-processing.
- Custom Systems: Random vibration, thermal stress, and fluid structure interaction problems.
- Design Exploration: Optimization, response surface, and Six Sigma analysis.
Let's perform a steady-state thermal analysis:
- Start with Engineering Data to specify material properties.
- Import the geometry and create a finite element model.
- Apply boundary conditions and solve the problem.
Conduction Simulation
To perform a conduction simulation:
- Apply temperature boundary conditions to the model.
- Solve the problem to observe temperature distribution and heat flux.
Convection Simulation
To add convection:
- Specify a convection coefficient and apply it to the relevant surfaces.
- Solve the problem to observe the effects of convection on heat transfer.
Note: The convection coefficient can be determined through heat transfer books or CFD simulations.
Radiation Simulation
To include radiation:
- Apply radiation boundary conditions to the surfaces.
- Specify emissivity and ambient temperature.
- Solve the problem to observe the effects of radiation.
Conclusion
We demonstrated how to perform conduction, convection, and radiation simulations using ANSYS Mechanical. For further questions, please contact us at info@ozeninc.com or visit our website www.ozeninc.com.
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Title: Heat Transfer Fundamentals with ANSYS Mechanical Good morning, good afternoon everyone. Welcome to our webinar on heat transfer. Today we are going to talk about how to do heat transfer simulation in ANSYS software products.
Before we get into that, I’ll present a short overview of Ozen Engineering, who we are, and what we do. We are a simulation company and the ANSYS distributor in California. We sell all ANSYS products, including fluid structures, electronics, optics, and a VR product for both simulation and design.
We also provide cloud services. We are the channel partner in California and Nevada. Our presentation will focus on the theory of heat transfer.
The governing equation for a linear system is given by: Specific heat matrix * d(Temperature) / dt + Conductivity matrix * Temperature = Heat loads If the problem is transient, we drop the first term on the left-hand side and only solve for the right-hand side.
Nonlinear problems arise from temperature-dependent thermal conductivity or heat loads that are a function of temperature. In these cases, the problem is solved in multiple iterations.
Temperature-dependent material properties, such as thermal conductivity and specific heat, can make the problem nonlinear. Temperature-dependent film coefficients, heat sources, and radiative heat transfer can also contribute to nonlinearity.
In this webinar, we will demonstrate how to solve conduction, convection, and radiation problems in ANSYS. Our workbench environment includes various physics options under Analysis Systems, Component Systems, Custom Systems, and Design Exploration.
We will use the State-to-State Thermal template for our heat transfer analysis. This involves specifying material properties, geometry, and the finite element model. We will then apply boundary conditions, such as temperature or convection, and solve the problem.
The results can be visualized using various plot options, such as temperature distribution or total heat flux. We can also perform a sanity check by ensuring that heat flows from hot to cold regions.
For convection problems, we can specify a uniform convection coefficient or perform a CFD simulation to obtain non-uniform convection coefficients. Radiation problems involve specifying emissivity and the ambient temperature for radiating surfaces.
The emissivity value is crucial, as a 10% error in the emissivity value will result in a 10% error in the heat loss due to radiation.
We will conclude our presentation by discussing thermal stress simulations, which can be performed by coupling the steady-state thermal analysis with a static structural analysis. If you have any questions, please contact us at info@ozonink.com or visit our website at ozonink.com.
We have a webinar coming up next week on topology optimization, and we encourage you to register for it on our website. Thank you for attending, and we look forward to seeing you in our future webinars. Have a great day.
