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The objective of this study is to unveil the effect of transverse partition height and partition spacing on convective heat transfer inside a ventilated rectangular enclosure. Three numbers of heat sources have been flush mounted on the bottom of the enclosure. The equations of mass, momentum and energy conservation are solved using a control-volume-based technique utilized by Ansys Fluent. A pressure...
The solar air collectors plans are the elements responsible for collecting solar energy (radiant) by transforming it into thermal energy. It also plays the role of exchange by selling the energy captured the coolant (air) flowing through them. The uses are manifold; namely; space heating, drying, etc. Their design is oriented in the desired efficacy, their destinations and the costs of installation...
The physics of fluid flow between two parallel rotating disks is the theoretical basis of the analysis and design of rotating machinery such as gas turbine. Rotor-stator system is one of the most pervasive types among rotating disk configurations. In this paper, the flow field in a rotor-stator system with its periphery totally open to atmosphere was numerically studied. The SST k-m model was employed...
Two techniques are described in this paper to analyze the dynamic and thermal behavior of a stationary air flow of forced convection in a solar collector with a perforated absorber. These perforations are vertical (plate 1) and inclined (plate inc) to the wall of insulation. Two absorber plates were used to determine the effect of absorber plate porosity as well as injection air flow rate on the collector...
Cross polarization in microwave link, method of using dual orthogonal polarizations to optimally conserve the frequency spectrum, has received considerable interest in the recent time. This paper implicitly discusses its prediction in sand and dust storms. Cross polarization in dust storms occurs due to the non-sphericity of the falling dust particles and the tendency of the particles to align in...
A method was developed to estimate the frequency of vortex shedding in turbulent flow. In this method, a bivariate correlation was improved and introduced to the continuous temporal flow structures to estimate the correlation of each pair of the vortex structures. The Fast Fourier Transform (FFT) was employed to perform a power spectra analysis of these correlation coefficients to obtain the frequency...
Different methods for thermal analysis of a high-speed permanent-magnet machine are presented. The first implemented method is a numerical method which couples computational fluid dynamics and heat-transfer equations. This method gives simultaneous solutions for the thermal and turbulent properties of the cooling fluid in a 2D axi-symmetric geometry and a 3D solution of the temperature distribution...
In this paper, a numerical two-phase flow model combining with the Realizable k-ε turbulent model for compressible viscous fluid is presented for the simulation the flow around a fixed-cone valve; and the equations are solved with the finite volume method. The free fluid surface is simulated by the VOF method. The function of the fixed-cone valve for energy dissipating is pointed out by analyzing...
Miniaturization is the trend in analytical chemistry and life sciences. In the past two decades, miniaturization of fluid handling and fluid analysis has been emerging in the interdisciplinary research field of microfluidics. Some of the microfluidic applications are drug delivery, lab-on-a-chip, pharmaceutical development, synthesis of amino acids etc. Most of these applications are used for biochemistry...
Gas migration in a goaf is the cause of upper corner gas over limit which greatly influences coal mining safety. To explore gas migration law, this paper provides a Lattice Boltzmann (LB) simulation of gas migration in a heterogeneous goaf of a fully mechanized coal caving mining face. The goaf of a fully mechanized coal caving mining face is an area which fills with heterogeneous porous media and...
Classical N-S equation is of first order accuracy in both time and space. First order scheme only includes first order terms, without the terms of second or higher order. These terms are relative to time and space intervals. As basic elements of fluid research, time and space intervals should be some finite quantities and not be infinitely near to zero as defined in mathematics. If the terms of second...
Since fabrication of microchips by MEMS technology has emerged, microchips that can interact with biological samples like virus, bacteria, DNA has been developed. Considering the advantages such as cost, dimension and compatibility with IC fabrication, these chips have found specific application areas. Microfluids and microfluidics constitute one of the major research areas of this emerging field,...
This paper presents an efficient parallel-distributed methodology for solving multiphysics problems. A functional decomposition of the global problem is used first followed by the classical geometrical decomposition . Several technical details are presented for more clarity and for easing its implementation. All the techniques discussed in this paper are illustrated for a CFD-based aero elasticity...
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