Modeling and Simulating of Straight Section of Jet Flow in Electrospinning Process: Using Non-Newtonian Behavior

Electrospinning is the most common method of producing ultrafine nanofibers and nowadays numerous polymers have been successfully electrospun in laboratory. There exist several models for this process which simulate several parts of process including A.F.Spivak et al,M.M.Hohman et al ,J.J.Feng et al,D.H.Reneker et al.one of the evolved models for the first stage of electrospinning process at which the pass of jet is straight is Feng's model which is simplified form of Hohman model.in this article the model of Feng in case of Newtonian fluid is used as a base but we introduced power law viscosity function instead of Newtonian viscosity and a set of two 2nd order nonlinear differential equations were resulted for E and R which represent electric field between plates and radius of jet respectively. Using numerical methods such as relaxation method and finite deference method, equations were solved. And electric field, radius and surface charge density were predicted along the jet pass and results were compared with experiments and Newtonian case, and role of flow index were discussed .power law equation represents shear thinning which in this case associates with pure extension thinning situation

کلیدواژه ها:

modeling ، Electrospinning ، jet ، power law