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 this work we propose a novel generalised form of the Phan–Thien and Tanner (PTT) model by considering a new functional form of the nonlinear expression characterizing the destruction of physical network junctions and entanglements. This new function of the trace of the stress tensor is given...
The fiber spinning of polyester is analyzed with an algorithm using the Phan Thien-Tanner model. The discrete relaxation spectrum, necessary for the multimode model, is determined with the storage and loss moduli. Experimental values of the moduli are extrapolated with the help of the Cox-Merz ...
Creeping Flow of Phan-Thien–Tanner Fluids in a Peristaltic Tube With an Infinite Long Wavelength In this study both linearized and the exponential forms of the Phan-Thien-Tanner model (PTT) are used to simulate the peristaltic flow in a tube. The solut... AEHAE Naby - 《Journal of Applie...
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 ...
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...
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 ...
This work presents a semi-analytical method for laminar steady-state channel and pipe flows of viscoelastic fluids using the Linear Phan-Thien-Tanner (LPTT) constitutive equation, with solvent viscosity contribution. For the semi-analytical method validation, it compares its results and two analytical...
Phan-Thien–Tanner (PTT) Solvent viscosity Stick-slip Boundary layers Stress singularity a b s t r a c t 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...