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Liu H.Y.,Zhongyuan University of Technology | Liu H.Y.,Soochow University of China | Si N.,Nantong Bubbfil Nanotechnology Company Ltd | He J.-H.,Zhongyuan University of Technology | He J.-H.,Soochow University of China
International Journal of Numerical Methods for Heat and Fluid Flow | Year: 2016

Purpose - The purpose of this paper is to point out a paradox in variational theory for viscous flows. Chien (1984) claimed that a variational principle of maximum power loses for viscous fluids was established, however, it violated the well-known Helmholtz's principle. Design/methodology/approach - Restricted variables are introduced in the derivation, the first order and the second order of variation of the restricted variables are zero. Findings - An approximate variational principle of minimum power loses is established, which agrees with the Helmholtz's principle, and the paradox is solved. Research limitations/implications - This paper focusses on incompressible viscose flows, and the theory can be extended to compressible one and other viscose flows. It is still difficult to obtain a variational formulation for Navier-Stokes equations. Practical implications - The variational principle of minimum power loses can be directly used for numerical methods and analytical analysis. Originality/value - It is proved that Chien's variational principle is a minimum principle. © Emerald Group Publishing Limited. Source


Shen J.,Soochow University of China | He C.-H.,Nantong Bubbfil Nanotechnology Company Ltd | Liu H.,Yancheng Institute of Technology | Zhao L.,Yancheng Institute of Technology
Thermal Science | Year: 2015

This paper explores the influence of pore size on gas resistance by comparing micron non-woven and nanofiber membrane.The result shows that membrane with a higher filtration and lower gas resistance can be received by controlling the pore size of nanofiber membrane. Source


Liu Z.,Soochow University of China | He C.-H.,Nantong Bubbfil Nanotechnology Company Ltd | Zhang S.-Z.,Yancheng Institute of Technology | Zhao L.,Yancheng Institute of Technology
Thermal Science | Year: 2015

Beaded fibers are often observed in electrospinning. However, its formation mechanism is not well understood. A mathematical model for pulsation of the charged jets during spinning is proposed to reveal the phenomenon of beaded fibers, andthe main factors for beaded fibers are elucidated. Source


Li Y.,Soochow University of China | Li X.-W.,Soochow University of China | Li X.-W.,Nantong Bubbfil Nanotechnology Company Ltd | He J.-H.,Soochow University of China | And 2 more authors.
Thermal Science | Year: 2014

Phase change materials for thermal energy storage have been widely applied to clothing insulation, electronic products of heat energy storage. The thermal storage potential of the nanofiber membranes was analyzed using the differential scanning calorimetry. Effect of microstructure of the membrane on energy storage was analyzed, and its applications to electronic devices were elucidated. Source


LI Y.,Soochow University of China | Si N.,Nantong Bubbfil Nanotechnology Company Ltd | He J.-H.,Soochow University of China | Wang P.,Soochow University of China | Wang P.,Jiangsu Wangong Technology Group Co.
Thermal Science | Year: 2015

Copper/PA66 nanofibers are fabricated by the bubbfil spinning, and their thermal stability is studied by calcination treatment. It reveals that the addition of copper nanoparticles can greatly improve the thermal stability of nanofibers. Source

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