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does heat transfer in solids and fluids include convection?

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Hello everyone,

I want to know if the physics "heat transfer in solids and fluids" alone includes natural convection or if I need to add Laminar flow with it.

Sincerely,


7 Replies Last Post 19 giu 2023, 12:26 GMT-4

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Posted: 1 year ago 14 giu 2023, 01:00 GMT-4

you should use a fluid interface to consider the 'convection'.

you should use a fluid interface to consider the 'convection'.

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Posted: 1 year ago 14 giu 2023, 04:42 GMT-4

Ok, thanks for your reply

Ok, thanks for your reply

Magnus Ringh COMSOL Employee

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Posted: 1 year ago 14 giu 2023, 08:12 GMT-4
Updated: 1 year ago 15 giu 2023, 02:18 GMT-4

Hi,

To clarify: The Heat Transfer in Solids and Fluids physics interface includes both a Solid node for heat conduction in solid domains and a Fluid node for heat convection and conduction in fluid domains, so you can use it for heat convection, but a Heat Transfer in Fluids physics interface is more appropriate if the entire computational domain consists of fluids. For the heat convection, the velocity can be taken from an added fluid-flow interface in your model, or you can use a user-defined expression for the velocity field. There is also a predefined Conjugate Heat Transfer multiphysics interface, which includes a laminar or turbulent fluid-flow interface and a predefined multiphysics coupling between the heat transfer and the fluid flow for modeling nonisothermal flow.

Best regards,

Magnus

Hi, To clarify: The Heat Transfer in Solids and Fluids physics interface includes both a Solid node for heat conduction in solid domains and a Fluid node for heat convection and conduction in fluid domains, so you can use it for heat convection, but a Heat Transfer in Fluids physics interface is more appropriate if the entire computational domain consists of fluids. For the heat convection, the velocity can be taken from an added fluid-flow interface in your model, or you can use a user-defined expression for the velocity field. There is also a predefined Conjugate Heat Transfer multiphysics interface, which includes a laminar or turbulent fluid-flow interface and a predefined multiphysics coupling between the heat transfer and the fluid flow for modeling nonisothermal flow. Best regards, Magnus

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Posted: 1 year ago 15 giu 2023, 11:00 GMT-4

Hi,

To clarify: The Heat Transfer in Solids and Fluids physics interface includes both a Solid node for heat conduction in solid domains and a Fluid node for heat convection and conduction in fluid domains, so you can use it for heat convection, but a Heat Transfer in Fluids physics interface is more appropriate if the entire computational domain consists of fluids. For the heat convection, the velocity can be taken from an added fluid-flow interface in your model, or you can use a user-defined expression for the velocity field. There is also a predefined Conjugate Heat Transfer multiphysics interface, which includes a laminar or turbulent fluid-flow interface and a predefined multiphysics coupling between the heat transfer and the fluid flow for modeling nonisothermal flow.

Best regards,

Magnus

Hi, Thanks for your reply now I understand it better. I have a question, when I use Conjugate Heat Transfer, does it also take in consideration heat transfer by radiation?

Best regards, Mohammed

>Hi, > >To clarify: The Heat Transfer in Solids and Fluids physics interface includes both a Solid node for heat conduction in solid domains and a Fluid node for heat convection and conduction in fluid domains, so you can use it for heat convection, but a Heat Transfer in Fluids physics interface is more appropriate if the entire computational domain consists of fluids. For the heat convection, the velocity can be taken from an added fluid-flow interface in your model, or you can use a user-defined expression for the velocity field. There is also a predefined Conjugate Heat Transfer multiphysics interface, which includes a laminar or turbulent fluid-flow interface and a predefined multiphysics coupling between the heat transfer and the fluid flow for modeling nonisothermal flow. > >Best regards, > >Magnus Hi, Thanks for your reply now I understand it better. I have a question, when I use Conjugate Heat Transfer, does it also take in consideration heat transfer by radiation? Best regards, Mohammed

Magnus Ringh COMSOL Employee

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Posted: 1 year ago 16 giu 2023, 02:28 GMT-4
Updated: 1 year ago 16 giu 2023, 02:29 GMT-4

Hi Mohammed,

With the Conjugate Heat Transfer multiphysics interface, you can add surface-to-ambient radiation to boundaries. With the Heat Transfer Module, there are additional physics interfaces for surface-to-surface radiation that you can add to the model if needed.

Best regards,

Magnus

Hi Mohammed, With the Conjugate Heat Transfer multiphysics interface, you can add surface-to-ambient radiation to boundaries. With the Heat Transfer Module, there are additional physics interfaces for surface-to-surface radiation that you can add to the model if needed. Best regards, Magnus

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Posted: 1 year ago 19 giu 2023, 05:35 GMT-4

Hi Mohammed,

With the Conjugate Heat Transfer multiphysics interface, you can add surface-to-ambient radiation to boundaries. With the Heat Transfer Module, there are additional physics interfaces for surface-to-surface radiation that you can add to the model if needed.

Best regards,

Magnus

Hi, Thanks for your reply I understand Hi Mohammed,

With the Conjugate Heat Transfer multiphysics interface, you can add surface-to-ambient radiation to boundaries. With the Heat Transfer Module, there are additional physics interfaces for surface-to-surface radiation that you can add to the model if needed.

Best regards,

Magnus

Hi, Thanks for your reply, I understand. Best regards, Mohammed

>Hi Mohammed, > >With the Conjugate Heat Transfer multiphysics interface, you can add surface-to-ambient radiation to boundaries. With the Heat Transfer Module, there are additional physics interfaces for surface-to-surface radiation that you can add to the model if needed. > >Best regards, > >Magnus >Hi, Thanks for your reply I understand >Hi Mohammed, > >With the Conjugate Heat Transfer multiphysics interface, you can add surface-to-ambient radiation to boundaries. With the Heat Transfer Module, there are additional physics interfaces for surface-to-surface radiation that you can add to the model if needed. > >Best regards, > >Magnus Hi, Thanks for your reply, I understand. Best regards, Mohammed

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Posted: 1 year ago 19 giu 2023, 12:26 GMT-4
Updated: 1 year ago 26 giu 2023, 03:34 GMT-4

Hi Mohammed,

With the Conjugate Heat Transfer multiphysics interface, you can add surface-to-ambient radiation to boundaries. With the Heat Transfer Module, there are additional physics interfaces for surface-to-surface radiation that you can add to the model if needed.

Best regards,

Magnus

Hi Magnus, I have another question if you don't mind, do I also need to add an additional physics interface for heat conduction or it's already included in the Conjugate Heat Transfer Multiphysics?

Best regards, Mohammed

>Hi Mohammed, > >With the Conjugate Heat Transfer multiphysics interface, you can add surface-to-ambient radiation to boundaries. With the Heat Transfer Module, there are additional physics interfaces for surface-to-surface radiation that you can add to the model if needed. > >Best regards, > >Magnus Hi Magnus, I have another question if you don't mind, do I also need to add an additional physics interface for heat conduction or it's already included in the Conjugate Heat Transfer Multiphysics? Best regards, Mohammed

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