Hi, I am working on phase change modelling using the enthalpy method. The governing equations for phase change is often reported in the following form:
A_s * h_s + A_w * h_w + A_p * h_p + A_e * h_e + A_n * h_n = Q;
where s, w , n, s and p indicate the location of the node, Q is the source term, h is the enthalpy. The link to a paper that used that equation is: http://www.sciencedirect.com/science/article/pii/0038092X9390029N
My question is: to solve for each node (p), I need the enthalpy of neighboring nodes (n, s, e ,w). But for the node at the boundary, there are not enough neighboring node, how should I treat the node that at the boundary. Please see the attached PDF for further elaboration on my problem.
Thanks for helps !!!!
Hi Minh,
At the boundary, there will be boundary conditions (eqn.), which they would be incorporated with the other energy balances, to solve the temperature or enthalpy for all all nodes.
Hi Minh, Ying and Ana are correct. The only thing you need is to specify the boundary condition for those nodes adjacent to the domain boundaries. The boundary condition can be heat fluxes or temperatures depending on your case.
you should look for boundary conditions that might a specified temperature or a constant heat flux or insulated surface etc. And also look for some initial condition that must be specified if you are going for transient analysis.
I recommend you to read this paper:
http://ijens.org/Vol_18_I_05/180505-3737-IJMME-IJENS.pdf
Best regards
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