Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Computing heat transfer coefficents at internal boundaries

Please login with a confirmed email address before reporting spam

As a simplification of things, let us consider we have flow of a fluid through a three-dimensional rectangular channel which is being heated from the bottom. The boundary at which the constant heat flux is applied is some distance away from the fluid-solid interface. In other words, it is a thick channel and the problem is that of conjugate heat transfer category.

The non-isothermal flow feature is used to couple the heat transfer and laminar flow modules. The objective is to derive the local heat transfer coefficeint at the flui-solid interface.

Obviously in the above expression, the local wall temperature can be evaluated using the line integral and the local fluid bulk temperature is the surface cross-sectional average at the particular location in the fluid domain.

My question is what option should be used to calculate the local heat flux. In the post -processing section we have many options:

  1. Domain fluxes > Conductive heat flux magnitude (This can be evaluated at a boundary too)
  2. Boundary fluxes > Normal conductive heat flux

Which is the correct flux value to use in this scenario ?


0 Replies Last Post 2021年9月4日 GMT-4 06:37
COMSOL Moderator

Hello Indrasis Mitra

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.