Fernando Pinho

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This paper reports the development and application of a finite-volume based methodology for the calculation of the flow of fluids which follow differential viscoelastic constitutive models. The novelty of the method lies on the use of the non-staggered grid arrangement, in which all dependent variables are located at the center of the control volumes, thus(More)
Most of the environments where mobile robots are deployed offer a comprehensive networking infrastructure. In order to take part of these environments, mobile robots must enhance not only their communication capabilities, but also their interaction capabilities. Current robotic frameworks are oriented to gather data from the robotic sensors and to act on(More)
As mobile robots become part of large networked infrastructures, concerns about the integration of robots into distributed applications arise. Due to the predominance of the Web protocols, it is natural mobile robots to employ such protocols for interacting over the network with other applications. Information transfer protocols such as HTTP and SOAP allow(More)
We study the flow of a Newtonian fluid through microfabricated hyperbolic contractions in detail. A set of planar converging geometries, with total Hencky strains ranging from 1 to 3.7, have been fabricated in order to produce a homogeneous extensional flow field within the contraction. The kinematics in the contraction region are investigated(More)
We present an experimental investigation of viscoelastic fluid flow in a cross-slot microgeometry under low Reynolds number flow conditions. By using several viscoelastic fluids, we investigate the effects of the microchannel bounding walls and the polymer solution concentration on the flow patterns. We demonstrate that for concentrated polymer solutions,(More)
This work presents a numerical technique for simulating incompressible, isothermal, viscoelastic flows of fluids governed by the upper-convected Maxwell (UCM) and K–BKZ (Kaye–Bernstein, Kearsley and Zapas) integral models. The numerical technique described herein is an extension of the GENSMAC method to the solution of the momentum and mass conservation(More)
In this work, a new experiment al device to visualize the filling of containers, under controlled and reproducible conditions, is described and employed to study the various phenomen a that occur during container filling with Newtonian fluids. The experimental results displayed a variety of flow patterns, including the phenomenon of jet buckling. The(More)
Numerical simulations of PTT fluids in axisymmetric sudden contractions were carried out to investigate the effect of contraction ratio on the flow patterns under conditions of negligible inertia. The PTT model selected has a linear stress coefficient, and contraction ratios (CR) in the range 4:1 to 100:1 were investigated. The simulations are based on a(More)
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