S. F. Azam , G. Cathcart,
 RCAST, The University of Tokyo, Tokyo, Japan
The objective of this paper is to achieve a complete and rapid efficient mixing of numerous sample in micro-scale devices of microfluidic system. The principle of microfluidics is extensively used in a number of fields such as biomedical, healthcare, biochemical, drug research and other applications. These microfluidic devices with mathematical simulations are appropriately utilized in ...
P. Sharma, S. K. Dash, B. K. Nashine, S. S. Kumar, R. Veerasamy, B. Krishnakumar, P. Kalyanasundaram, and G. Vaidyanathan
 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu
Sodium is used as a coolant in Fast Breeder Reactors. Eddy Current Flowmeter (ECFM) is used for measurement of sodium flow in the primary pump and at the outlet of the subassemblies. Eddy Current Flowmeter (ECFM) works on the principle of change in the magnetic field profile due to induced eddy currents as a result of sodium flow. It consists of a central primary winding, energized from an A.C. ...
Fondazione Bruno Kessler (FBK), Renewable Energies and Environmental Technologies (REET) Unit, Trento, Italy
Concentrated photovoltaic systems with high efficiency solar cells are being widely investigated, aiming at improving the cost-efficiency balance in the solar energy field. Different cell types are in use: e.g., high concentration triple junction cells, reaching efficiencies of the order of 35 - 40 % at 1000 suns, and medium concentration mono-crystalline silicon cells, with efficiencies of the ...
A.-M. Georgescu, S.-C. Georgescu
Hydraulics and Environmental Protection Department, Technical University of Civil Engineering, Bucharest, Romania
Hydraulics Department, University “Politehnica”, Bucharest, Romania
We propose a simplified numerical method to model the flow field downstream of an axial impeller. The method can be used for any axial hydraulic machinery for which, one is less interested by the flow between the blades, than by the flow field downstream of the machinery. The method is applied to an axial fan for which the pressure - flow rate curve is available. Numerical results are obtained ...
E. Carcadea, M. Varlam, I. Stefanescu
National Research Institute for Isotopic & Cryogenic Technologies, Rm.Vâlcea, Romania
Steam methane reforming is a widely studied process because of its importance for hydrogen production. A two-dimensional membrane-reactor model was developed to investigate the steam-methane reforming reactions. The use of membrane as membrane-reactor separator offer us few advantages because it help in continuously removing the hydrogen from the reaction zone, shifting the chemical equilibrium ...
I. Neitzel, R. C. F. do Nascimento, C. C. Bueno
Faculdade de Telêmaco Borba - FATEB, Telêmaco Borba, Paraná, Brasil
Neste trabalho é analisado o comportamento dos perfis de temperatura e umidade e sua penetração em bobinas de papel submetidas a longos períodos de armazenagem. O modelo considera a transferência simultânea de calor e massa com o efeito Soret, mas sem o efeito Latour. O sistema é fechado em relação à umidade e aberto em relação à energia. As propriedades térmicas são dependentes da umidade e ...
LIMCA技术是一种原位测量高温液态金属中杂质颗粒的方法。测量的原理为：在一个小孔内外设置一对电极，并且通以电流，这样可以在孔口附近形成一个电敏感区，当杂质经过电敏感区时，通过测量电压脉冲信号以检测杂质的信息。对硬质颗粒的LIMCA技术已经有了许多研究，但实际情况下有些颗粒如气泡是可变形的，这将损害LIMCA的精度。 模型使用了 COMSOL Multiphysics® 中的“层流两相流-相场”和“电磁场”模式，气泡和液态铝以相同的初始速度向相同方向运动，同时在液态导电金属中通以电流。由于流体和气泡是运动的，流动会受到洛伦兹力的影响，所以在流场中加入由电磁场计算得到的“mef.FLtzr”和“mef.FLtzz”作为体积力源项。同时流动结构的改变也会影响电磁场，两个物理场之间存在着强耦合，需要同时求解。 数值计算结果给出了在气泡变形情况下的流场、电磁场 ...
N. Luchier [1,2], P. Forestier [1,2], E. Bouleau [1,2]
 Univ. Grenoble Alpes, Grenoble, France
 CEA, Grenoble, France
Our laboratory is currently leading the design and the manufacture of a novel device that allows NMR spectroscopy to be cooled down to cryogenics temperature (in the 10-100 K range). The system features a sample-holder that rotates at very high frequencies (f >10 kHz). Two aerostatics gas-bearings, allows this sample holder to be suspended in its chamber thanks to a Helium flow. A second Helium ...
E. D. Skouras , A. N. Kalarakis , M. S. Valavanides , V. N. Burganos ,
 Foundation for Research and Technology, Hellas/Institute of Chemical Engineering Sciences, Patras, Greece
 Dept of Mechanical Engineering, TEI of Western Greece, Patras, Greece
 Dept of Civil Engineering, Applied Mechanics Laboratory, TEI of Athens, Athens, Greece
In general, macroscopic two-phase flow in porous media is a mixture of connected and disconnected oil flow. The latter is expressed as ganglion dynamics and drop traffic flow, patterns observed experimentally in pore network models [1,2] and real porous media [3,4]. This characteristic was adversely not taken into account in previous modeling approaches. The mechanistic model DeProF , ...
Preliminary Study of Particle Trajectory and Secondary Flow in Bend Configurations to Reduce Erosion
O. Ayala , A. Arruda , L. Calembo , E. Enes , D. Monteiro , R. Paizante , A. Rocha , M. Simões , J. Michaeli ,
 Department of Engineering Technology, Old Dominion University, Norfolk, VA, USA
 Brazil Scientific Mobility Program, CAPES, Brasilia, DF, Brazil
To the best of our knowledge, only few researchers have made attempts to minimize the erosion in bends by modifying the bend configuration in order to alter the particle-laden flow pattern to reduce the erosion. In this work, we revisited those previously proposed bend configurations to reduce erosion, in additional to two of our own design. We found that secondary flows play an important role ...