Zahra Khubi-Arani - Department of Polymer & color Engineering, Amirkabir University of Technology, Tehran, Iran.
Mehdi Rafizadeh - Department of Polymer & color Engineering, Amirkabir University of Technology, Tehran, Iran.
Parvin Karimi - Department of Polymer & color Engineering, Amirkabir University of Technology, Tehran, Iran.
Zahra Daneshfar - Department of Polymer & color Engineering, Amirkabir University of Technology, Tehran, Iran.

Electrospinning is a straightforward method of producing nanofibers, i.e., fibers with submicron diameters, under elongation by external electrostatic forces on a chargedpolymer jet before its solidification. Up to now, nanofibers of many polymers produced successfully in the laboratory, butfew theoretical studies have been done about them which its development can improve significantly property prediction ofnanofibers before doing of any experimental research [1, 2]. In this work, a mathematical model for electrospinning of a newtonian polymer nanofiber is investigated based onconservation law and different properties such as the nanofiber radius R, electric field E, surface charge density σ and jet velocity v along the axial direction, z, is predicted.