thermal contact

[Maffo]

Hi, everybody, I have this problem that I just don't come up with.

I have two bodies at different temperature, in contact with each other on a superifcie. set all the initial temperatures (in workbench) and attribute the film co-effectiveness, the transitional simulation starts and comes to convergence. and in fact the cold body warms up from dowry the warm body is in contact. on the other body, the contact surface cools, but the rest of the body is even from a lower temperature of the surface!

how is it possible and what could be the cause?

 

[bio]

Hi, everybody, I have this problem that I just don't come up with.

I have two bodies at different temperature, in contact with each other on a superifcie. set all the initial temperatures (in workbench) and attribute the film co-effectiveness, the transitional simulation starts and comes to convergence. and in fact the cold body warms up from dowry the warm body is in contact. on the other body, the contact surface cools, but the rest of the body is even from a lower temperature of the surface!

how is it possible and what could be the cause?

If you have used the film coefficient on the hot body it can be that this coefficient is too high and dissipi more heat out of how much it dissipites towards the other body. .

check the settings :d

bio

 

[Maffo]

the co-effective of film was set on the only contact surface. in theory not to set up other film coefficients should ensure the adiabaptism of other surfaces outward.

Am I right?

 

[bio]

the co-effective of film was set on the only contact surface. in theory not to set up other film coefficients should ensure the adiabaptism of other surfaces outward.

Am I right?

Not wrong. :

But you put a film coefficient between the two bodies? In theory it wouldn't help. . .

bio

 

[Maffo]

In fact, I had the doubt too, but the command I use is "sf" and expressly requires a co-effective value of movies and for both bodies....

 

[Maffo]

I have read now in the guide that the utility "convection" applies between a body surface and a fluid, which makes sense the coefficent of films. I wonder now: between two covers is enough to set the thermal properties of the bodies and places in contact these transfer heat between them, or in any case is it necessary something that still escapes me?

 

[Irwin]

I know that in the classical environment of ansys you can create a thermal contact bond in the preprocessor through the contact pair voice and imposes the thermal conductance on the two bodies. in workbench there should be something equivalent.

 

[Maffo]

In fact I also found in workbench the window where to manage a contact between two bodies/surfaces and impose a personal tcc instead of letting it run by the software. the problem remains precisely that one of the two bodies cools as it should, but the other does not receive any form of heating.

If you impose the tcc, in theory you wouldn't need to command convection, would you?
Why, however, without such command, but also with high tccs, the bodies remain at the initial temperature assigned with the ic command?