an attempt is made for the first time to solve the quadratic and cubic model of magneto hydrodynamic poiseuille flow of phan-thein-tanner (ptt). series solution of magneto hydrodynamic (mhd) flow is developed by using homotopy perturbation method (hpm). results are presented graphically and the effects of non-dimensional parameters on the flow field are analyzed. the results obtained reveals ma...

An attempt is made for the first time to solve the quadratic and cubic model of magneto hydrodynamic Poiseuille flow of Phan-Thein-Tanner (PTT). A series solution of magneto hydrodynamic (MHD) flow is developed by using homotopy perturbation method (HPM). The results are presented graphically and the effects of non-dimensional parameters on the flow field are analyzed. The results reveal many i...

This work provides analytical and numerical solutions for the linear, quadratic and exponential Phan–Thien–Tanner (PTT) viscoelastic models, for axial and helical annular fully-developed flows under no slip and slip boundary conditions, the latter given by the linear and nonlinear Navier slip laws. The rheology of the three PTT model functions is discussed together with the influence of the sli...

One of the challenges for manufacturing processes polymeric parts is dedicated control composite melt flow. In present work, predictive capability Phan-Thien-Tanner (PTT) viscoelastic model evaluated in relation to extrudate swell from slit dies at 200 °C, considering polypropylene and graphite filler, applying ANSYS Polyflow software. It shown that sufficiently low filler amounts (below 10%; v...

We provide a detailed comparison of the two-dimensional, temporal and spatiotemporal linearized analyses viscoelastic free shear flows in limit low to moderate Reynolds number Elasticity obeying four different types stress-strain constitutive equations: Oldroyd-B, Upper Convected Maxwell, Johnson-Segalman (JS) linear Phan-Thien Tanner (PTT). The resulting fourth-order Orr-Sommerfeld Equation is...

Modern optical fibers require double-layer coating on the glass fiber to provide protection from signal attenuation and mechanical damage. The most important plastic resins used in wires and optical fibers are plastic polyvinyl chloride (PVC) and low-high density polyethylene (LDPE/HDPE), nylon and Polysulfone. In this paper, double-layer optical fiber coating is performed using melt polymer sa...

This work presents new semi-analytical solutions for the combined fully developed electro-osmotic pressure-driven flow in microchannels of viscoelastic fluids, described by generalised Phan-Thien–Tanner model (gPTT) recently proposed Ferrás et al. (Journal Non-Newtonian Fluid Mechanics, 269:88–99, 2019). version PTT a function trace stress tensor—the Mittag–Leffler function—where one or two fit...

Pulse transit time (PTT), the interval between ventricular electrical activity and peripheral pulse wave, is assumed to be a surrogate marker for blood pressure (BP) changes. The objective of this study was to analyze PTT and its relation to BP during cardiopulmonary exercise tests (CPET). In 20 patients (mean age 51+/-18.4 years), ECG and finger-photoplethysmography were continuously recorded ...

The use of problem-based learning (PBL) in the Charité Berlin Human Medicine model curriculum requires the annual training of 80 to 100 new PBL tutors using PBL tutor training (PTT). Therefore, the following three measures were taken: The existing traditional PTT (Trad-PTT) was further developed into an interactive PTT (Inter-PTT), which is using more interactive teaching tools. Both PTT concep...

Nanoshell-mediated photothermal therapy (PTT) is currently being investigated as a standalone therapy for the treatment of cancer. The cellular effects of PTT include loss of membrane integrity, so we hypothesized that nanoshell-mediated PTT could potentiate the cytotoxicity of chemotherapy by improving drug accumulation in cancer cells. In this work, we validated our hypothesis using doxorubic...