thermal.tempDependentFluidBeta=False

Asked by Jiannan Wang on 2020-09-07

Hello,

The default setting of the thermal engine is tempDependentFluidBeta=False. And it says "If true, fluid volumetric thermal expansion is temperature dependent (linear model between 20-70 degC)". I thought the fluid volumetric thermal expansion is always temperature dependent?

Best regards
Jiannan

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Yade Edit question
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Solved by:
Jiannan Wang
Solved:
2020-09-07
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2020-09-07
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2020-09-07
Robert Caulk (rcaulk) said : #1

>I thought the fluid volumetric thermal expansion is always temperature dependent?

I don't understand the question. ThermalEngine lets you turn various phenomena on and off as you like. At risk of being redundant: If you want to model thermal expansion of fluid as linear model between 20-70 degC, then turn that on. If not, then turn it off. Am I missing something?

Jiannan Wang (jnwang) said : #2

Hello Robert,

Thank you for replying so fast. Just to make sure I understand, by setting it off, the thermal expansion of fluid is nonlinear or just no thermal expansion?

Thank you again.

Best regards
Jiannan

Robert Caulk (rcaulk) said : #3

I think I understand the confusion now.

>, by setting it off, the thermal expansion of fluid is nonlinear or just no thermal expansion?

Neither.

The beta parameter is the volumetric coefficient of expansion for the fluid [1]. It itself can be temperature dependent for some fluids. For water, it is linearly dependent on the fluid temperature. ThermalEngine will automatically set the coefficient of thermal expansion (beta) according to temperature if you set tempDependentFluidBeta=True. If you set it to False, then the beta thermal expansion coefficient is temperature independent (constant).

Cheers,

Robert

https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.ThermalEngine.fluidBeta

Robert Caulk (rcaulk) said : #4

I will update the documentation to clarify this.

Jiannan Wang (jnwang) said : #5

Hello Robert,

Thank you for the clarification. That really answers my question.

Best regards
Jiannan