i'm simulating heat and mass transfer inside two phase closed thermosyphon using 2-d axysymmetric geometry.i've selected pressure based solver and transient.I am using ANSYS /FLUENT 19 student version .VOF method with Lee Model is used . Water is used as secondary phase and Vapor is used as primary phase. SIMPLE algorithm scheme for pressure velocity coupling and a first order upwind scheme for the determination of momentum and energy is included in the model. Geo –Reconstruct and PRESTO discretization for the volume fraction and pressure interpolation scheme, respectively, are also performed in these simulations. but,after running the calculation,contour is showing phase change only in the evaporator region as shown in attached figure.I've also patched the liquid water fill ratio with volume fraction=1 in the evaporator region.Can anyone help me out?
Seems like you have divided your geometry. Which creates a wall between two region and it won't allow vapor to go in condenser region. you need to fix geometry.
sir,i've splitted walls i.e, line at the top using student version of ANSYS 19.0 SPACE CLAIM into three lines and named it as evaporator wall,adiabatic wall and condenser_wall.I've defined the rectangular domain as fluid instead of solid which is as default.
further in boundary conditions dialog box in fluent,in all the three walls i've selected material as copper and wall thickness as 0.0009m.
Thank you.
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