Does anyone here have experience with COMSOL? I want to model a system where i have a fluidic channel containing warm fluid running through a block and I want to analyze the heat transfer from the channel into the block . To establish the warm fluid I put an initial temperature condition at the inlet of the channel. But I think this limits my model since the heat isn't being "carried" by the fluid down the length of the channel. For example I don't see much difference when varying the flow rate which I would expect. Does anyone know what would be better boundary conditions for this model? Can I put in an equation for heat flux? What variables should the equation include? Should I apply it to the inlet or the walls of my channel? Thanks!