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How the (-VE) ambient temperature to be simulated?

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Old   August 29, 2017, 07:34
Default How the (-VE) ambient temperature to be simulated?
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Nikhil
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I am beginner in CFD.I am having two pipes laid one above the other.Both pipes carrying high temperature fluid through it.The assembly is in low ambient temperature and fully insulated.Goal of the project is to find the temperature distribution within the pipe.Heat is to be transferred from one hot fluid-1st pipe- 2nd pipe -other fluid.
The problems i am facing are :
1. How to simulate (-VE) ambient temperature?
2.How to capture the convection within the fluid?
Please help me out !
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(-ve) ambient temperature, conduction+convection

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