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Numerical study on polymer nanofibers with electrically charged jet of viscoelastic fluid in electrospinning process

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Journal of Central South University 2017年第10期24卷 2275-2280页

作者： P.Valipour H.Zaersabet M.Hatami Ali Zolfagharian S.E.Ghasemi Department of Textile and Apparel Qaemshahr BranchIslamic Azad UniversityQaemshahrIran Department of Mechanical Engineering Esfarayen University of TechnologyEsfarayenNorth KhorasanIran School of Engineering Deakin UniversityGeelongVictoria 3216Australia Young Researchers and Elite Club Sari BranchIslamic Azad UniversitySariIran

Electrospinning is a useful and efficient technique to produce polymeric nanofibers. Nanofibers of polymers are electrospun by creating an electrically charged jet of polymer solution. Numerical study on non-Newtonian and viscoelastic jets of polymer nanofibers in electrospinning process is presented in this work. In particular, the effect of non-Newtonian rheology on the jet profile during the electrospinning process is examined. The governing equations of the problem are solved numerically using the Keller-Box method. The effects of yield stress and power-law index on the elongation, velocity, stress and total force are presented and discussed in detail. The results show that by increasing the values of yield stress, the fluid elongation is reduced significantly.

关键词： nanofibers electrospinning electrically charged jet viscoelastic fluid synthetic polymers

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Momentum equation for straight electrically charged jet

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Applied Mathematics and Mechanics(English Edition) 2011年第12期32卷 1515-1524页

作者：张若京 S. H. HOU C. K. CHAN School of Aerospace Engineering and Applied Mechanics Tongji University Shanghai 200092 P. R. China Department of Applied Mathematics The Hong Kong Polytechnic University Hong Kong P. R. China

A one-dimensional momentum conservation equation for a straight jet driven by an electrical field is developed. It is presented in terms of a stress component, which can be applied to any constitutive relation of fluids. The only assumption is that the fluid is incompressible. The results indicate that both the axial and radial constitutive relations are required to close the governing equations of the straight charged jet. However, when the trace of the extra stress tensor is zero, only the axial constitutive relation is required. It is also found that the second normal stress difference for the charged jet is always zero. The comparison with other developed momentum equations is made.

关键词： electrically charged jet stability electrospinning

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