在本研究中,我们研究了非牛顿流体通过恒温壁面狭缝型平行板微通道的电渗和压力驱动的联合流动。为了模拟流体的非牛顿流变,我们使用了一个简化的Phan - Thien - Tanner模型,并通过调用EDL势的全尺度解获得了速度、流量和剪切应力分布的闭式解析解。利用Debye–Huckel线性化近似也得到了相应的结果。另一方面,对于恒温壁...
In the present work, we develop a smoothed particle hydrodynamics (SPH) method for simulating transient viscoelastic fluid flows governed by the Phan-Thien-Tanner (PTT) constitutive equation. To improve the computational accuracy of the SPH method, the mixed symmetric correction algorithm of kernel ...
Two problems of laminar-forced convection in pipes and channels, under fully developed conditions, are solved for an imposed constant temperature at the wall, with fluids obeying the simplified Phan-Thien–Tanner (SPTT) model. The fluid properties are taken as constants and axial conduction is negl...
Numerical study of Phan-Thien–Tanner viscoelastic fluid flow around a two-dimensional circular cylinder at a low Reynolds number: a new classification for drag variations regimesNumerical study of Phan-Thien–Tanner viscoelastic fluid flow around a two-dimensional circular cylinder at a low Reynolds ...
The stress singularity of the Phan-Thien–Tanner (PTT) fluid is determined for steady planar stick-slip and slip-stick flows. In the presence of a solvent viscosity, we show that the velocity field is Newtonian dominated local to the singularity. The velocity vanishes as v=O(r12), with r...
Pinho, Plane contraction flows of upper convected Maxwell and Phan-Thien-Tanner fluids as predicted by a finite-volume method, J. Non- Newton. Fluid Mech. 88 (1999) 63-88.P.J. Oliveira, F.T. Pinho, Plane contraction flows of upper convected Maxwell and Phan-Thien-Tanner Fluids as ...
The uid behaviour is described by the recently proposed viscoelastic model, known as the generalised simplied Phan-Thien-Tanner constitutive equation, that considers the Mittag-Leer function instead of the classical linear and exponential functions of the trace of the stress tensor, and provides one ...
It also predicted the transient shear properties with moderate accuracy in the transient phase, but very well at higher times, compared to the Phan-Thien Tanner model and the Giesekus-Leonov model. None of the models predicted all observed data consistently well. Overall the White-Metzner model ...
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Norouzi M (2016) Analytical solution for the convection of Phan-Thien-Tanner fluids in isothermal pipes. Int J Therm Sci 108:165-173Norouzi, M., 2016, Analytical solution for the convection of Phan-Thien-Tanner fluids in isothermal pipes, Int. J. Therm. Sci. 108, 165-173....