We describe a new species of Rhinella from montane forests between 1788 and 2305 m a.s.l. in the Departamentos Amazonas San Martín, Peru. tentatively assign to festae Group based on morphological similarities with its other 19 members. It is characterised by large size (maximum SVL 91.6 mm females), pointed protruding snout that posteroventrally inclined, absence visible tympanic annulus membra...

An experimental and numerical study has been carried out to investigate the heat transfer by natural convection in a three dimensional annulus enclosure filled with porous media (silica sand) between two inclined concentric cylinders (and without) annular fins attached inner cylinder under steady state condition; The experiments were for range of modified Rayleigh number (0.2 ≤Ra*≤ 11) extended...

The encapsulation technique of phase change materials in the nanodimension is an innovative approach to improve heat transfer capability and solve issues corrosion during melting process. This new type nanoparticle suspended base fluids call NEPCMs, nanoencapsulated materials. goal this work analyze impacts pertinent parameters on free convection entropy generation elliptical-shaped enclosure f...

This study focuses on analyzing the turbulent flow of drilling fluid in inclined wells using Computational Fluid Dynamics (CFD) technique. The analysis is performed considering an annulus with a fixed eccentricity 90% and varying properties, diameter ratio, bed thickness to examine velocity profile, pressure loss, overall wall average shear stresses. CFD simulation results are compared existing...

In this study, a 1-D transient state mechanistic model of cuttings transport with foam in inclined wells has been developed. The model is solved numerically to predict the optimum foam flow rate (liquid and gas rate) and rheological properties that would maximize cuttings transport efficiency in inclined wells. A detailed sensitivity analysis of the effect of gas and liquid flow rates, drilling...

Nonlinear thermal convection in a fast rotating annulus about its axis, with slightly inclined ends, radial gravity and heating, is studied numerically for a fluid of Prandtl number sigma=0.7 and different values of the radius ratio and rotation rate. The properties of the rotating waves that appear after the Hopf bifurcation of the conductive state are analyzed. Near the critical Rayleigh numb...

The nature of the primary instabilities that arise in a fluid contained in a fast rotating cylindrical annulus with slightly inclined plane top and bottom boundaries, radial gravity, and internal heating is numerically analyzed. It is shown that for moderate and high Prandtl numbers, the onset of convection is described by a competition of azimuthal thermal modes with different radial structure...

Rotational drilling was a revolution in drilling technology. It made the drilling process more efficient and faster and more depth of well could be achieved through rotation method. Besides all of its advantages, the rotation approach induced some problems like pipe sticking and downhole cleaning to the drilling procedure. Hole cleaning and reduction of torque and drag seems to be vital in incl...