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Characterization And Modeling Of Conjugated Polymer Sensors, Yang Fang, Xiaobo Tan, Andrew Temme, Gursel Alici
Characterization And Modeling Of Conjugated Polymer Sensors, Yang Fang, Xiaobo Tan, Andrew Temme, Gursel Alici
Faculty of Engineering - Papers (Archive)
In this paper the behavior of conjugated polymers as mechanical sensors is experimentally characterized and modeled. A trilayer conjugated polymer sensor is considered, where two polypyrrole (PPy) layers sandwich an amorphous polyvinylidene fluoride (PVDF) layer, with the latter serving as an electrolyte tank. A theory for the sensing mechanism is proposed by postulating that, through its influence on the pore structure, mechanical deformation correlates directly to the concentration of ions at the PPy/PVDF interface. This provides a key boundary condition for the partial differential equation (PDE) governing the ion diffusion and migration dynamics. By ignoring the migration term in the …
Modeling Of Viscoelastic Turbulent Flow In Channel And Pipe, Shuqing Yang, G Dou
Modeling Of Viscoelastic Turbulent Flow In Channel And Pipe, Shuqing Yang, G Dou
Faculty of Engineering - Papers (Archive)
This paper investigates turbulent flows with or without polymer additives in open channels and pipes. Equations of mean velocity, root mean square of velocity fluctuations, and energy spectrum are derived, in which the shear stress deficit model is used and the non-Newtonian properties are represented by the viscoelasticity α*. The obtained results show that, with α* increment, (1) the streamwise velocity fluctuations is increased, (2) the wall-normal velocity fluctuation is attenuated, (3) the Reynolds stress is reduced, and (4) there is a redistribution of energy from high frequencies to the low frequencies for the streamwise component, but …