conformal cooling in Fluent

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  • Last Post 11 February 2020
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Jackely posted this 04 February 2020

I've been working on conformal cooling channels for weeks.
I started with Steady State Thermal to understand the problem better (see link).
and now I'm trying this in Fluent with a given speed.
i don't get along with Fluent yet, i have seen couples tutorials.
I do not see any temperature distribution in the component.
I think something is wrong with Boundary Conditions!

in this tool are 2 channels where plastic (200 °C) and water (40 °C) flows through.

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rwoolhou posted this 05 February 2020

Please post screen grabs of the thermal tab of the wall that separates the liquid & solid.

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Jackely posted this 05 February 2020

 Many thanks for your answer
I see now that that wall is deifying as Coupled.

shall I define the heat generation rate?

I have 4 walls in total!


Jackely posted this 08 February 2020

I modified the boundary conditions and created a new geometry.
I've activated three models: Multiphase, Energy and Viscous k-epsilon.
a heat flux density of 50 000 W/m^2 flows along the wall.

But the result does not look realistic (see last picture).

 

 

 

 

abenhadj posted this 10 February 2020

Are you doing the full run in Fluent? Or are you coupling to structural/thermal?

Best regards, Amine

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Jackely posted this 10 February 2020

i do full run at Fluent. into canal flows water by speed of 2m/s and 40°C and upside at wall affects heat flux density of 5 w/cm^2

 

abenhadj posted this 10 February 2020

Okay so water is located in that cylindrical part. If you want to visualize the temperature at the solids you need to use Static Temperature. Total Temperature is only defined for Fluids.

Start at first without multiphase: just check if your setup makes sense.

Best regards, Amine

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abenhadj posted this 10 February 2020

Moving to the Fluid Dynamics Category.

Best regards, Amine

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Jackely posted this 10 February 2020

Thanks for your answer.

 i have now only activated the energy and k-e for Models

 

 

I have researched the internet, and most of them say that the problem could be with the interface.
i have defined the two interfaces as a wall (Coupled).

 

 

 

The results are still not realistic.

abenhadj posted this 10 February 2020

But you do not have interfaces you have interior cells. Please do not change that type. Please show mesh lines to check if the mesh is conformal

Best regards, Amine

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abenhadj posted this 10 February 2020

Please go to Flux Flux report and screenshot total heat transfer there as well as mass flow rates.

Best regards, Amine

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Jackely posted this 10 February 2020

That's right, I don't have an interface.
these are the pictures

 

 

 

 

 

 

 

 

 

 

abenhadj posted this 11 February 2020

And what does now the Flux report tell u?

Best regards, Amine

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Jackely posted this 11 February 2020

the mass flow stays constant between inlet and outlet and this is realistic, other components are 0 because they are solid and do not move.
the heat flow at outlet is bigger than at inlet.

and in components there is no heat flow, but in the layer between water and component yes (- 3,3283 W and 3,324 W)


what should I do to get the heat flow into the component?

abenhadj posted this 11 February 2020

I do not understand. You have a heat flow from solid to fluid so it is working. You can post process the temperature at the wall on the fluid side and its shadow on the solid side.

Best regards, Amine

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Jackely posted this 11 February 2020

i have now shown the temperature distribution, the distribution looks relaistic, but the values do not.
Water temperature should actually only be 40°C.

 

 

Jackely posted this 11 February 2020

 with CFX The results look different.

Jackely posted this 11 February 2020

Thanks for your tips
The problem is solved, I defined a surface at Fluid (and called interface)
and then changed interface to wall and defined as coupled.

 

 

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