Determination of Boundary Conditions

The simulation of a process involving momentum, heat, and mass transfer by numerical method requires not only appropriate mathematic model but also its boundary conditions. The boundary condition of velocity, temperature, concentration, and pressure is depending on the simulated object, while that of 

The boundary condition of k-E model has long been investigated and found that the inlet condition of k is proportional to the average kinetic energy (represented by if), that is [18]  

Liu found that better simulated results were obtained in packed column if [6-9] 

The outlet boundary is usually set to the condition where the flow is fully developed to turbulence, so that in the main flow direction x, all physical quantities 4 except pressure are set to be  

At the wall surface, no-slip condition is applied so that U, k, s are equal to zero. 

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It is well known that multiphase flow in tubular canals is accompanied by fibering. Phase disengagement leads to reduction of specific surface of reacted flows and consequently to additional diffusion limitations under fast chemical and mass-exchange physical process realization under polymers synthesis. This determines the expediency of determination of boundary condition of homogeneous and fibered regions of reaction mixture flow formation in tubular turbulent apparatus. 

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