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November 7, 2017, 06:12 |
How to tinker and verify convectional models
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#1 |
New Member
Jakob Lindqvist
Join Date: Dec 2016
Posts: 9
Rep Power: 9 |
Hello! Here follows a brief project explanation.
We are supposed to develop a methodology in how you can control cooling rates in a nickel based AM alloy. Depending on different cooling rates in the range of 1000 °C and about 700 °C, the material structure in terms of certain particle sizes are changed (this is outside my area). We want to map this relation to the cooling rates and our plan is: Heat the sample to desired temperature and use a big volume of a copper block, a cylinder about 100 time bigger volume than the nickel sample. With a IR-camera provided by a company related to our project we will measure one side of the sample as it cools down. We will make this side sooty to be able to estimate the emissivity (which is another great uncertainty). The goal is to verify our simulations and export the simulated results in terms of cooling rates over the sample volume to try to relate it to particle size later on. This picture illustrates the temperature difference between two time steps in sims. It is somewhat a bit sketchy to us. https://imgur.com/nNVjw9V We need to measure the entire side of the sample to know different temperatures over the sample side to simulate a cooling rate gradient. Now to my question. We are using a number of standard convectional models taken from J.P Holman literature provided to us in another course. How are we going to be able to verify the convectional models and how should we be tinkering them to aquire reliable simulations. I could imagine verifying convectional heat transfer as whole but when we have different models to vertical and horizontal planes and cylindric surfaces, how do we allocate the convectional heat transfer and where do we tinker the models? What is a good approach to this problem? I'm happy to explain more if that is required to answer! Thankful for everything! /Jakob |
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ansys 18.2, cfx |
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