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Boundary conditions in heat transfer
Posted Dec 21, 2009, 2:36 PM EST Heat Transfer & Phase Change 3 Replies
I want to model a muscle tissue containing a capillary blood vessel. Now I’m using a simple model for start… My model geometry is in the attached file.
As I want to model heat convection between the tissue and blood I want to use on interior boundaries between the blood vessel the “heat flux discontinuity” boundary condition.
My main question is regarding Tinf: according to comsol help files: “Tinf is the external bulk temperature” and this is from the section of interior boundaries (heat flux discontinuity- interior boundaries only)… I don’t understand which subdomain is considered as having external bulk temperature? The blood vessel or the tissue surrounding it? This is a critical question as the temperature of the blood and the tissue are not equal in my model… I’m modeling the tissue as having 37C and the blood as 35C… Does Tinf belong to the subdomain of the higher temperature? in another case of the model I’m representing both blood and tissue as having 37C, but when the tissue has a higher heat production rate from metabolism…
Also, in my model I am representing heat production from metabolism using the subdomain settings of the bioheat modulo, so I thought of setting q=0… I’m not sure whether I best set q=0 or maybe I should set it’s value as the same value I set the metabolic heat of blood? What do you think?