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 ...
D. Lahaye, L. Cheng
DIAM, EEMCS Faculty, TU Delft, The Netherlands
Tsinghua University, Beijing, China
In the production of high quality materials by a heat treatment, it is indispensable to accurately predict the temperature inside the furnaces being employed. In this work we develop a turbulent combustion model for the heat being released by gas burners inside a shaft kiln. Turbulent combustion is the strongly coupled phenomena of the chemically reacting fuel and oxygen in a turbulent flow. ...
A. Eden , C. McCallum , B. Storey , C. D. Meinhart , S. Pennathur ,
 University of California Santa Barbara, Santa Barbara, CA, USA
 Olin College, Needham, MA, USA
We present a novel method for concentrating and focusing small analytes by taking advantage of the nonuniform ion distributions produced by thick electric double layers (EDLs) in nanochannels with heterogeneous surface charge. Specifically, we apply a voltage bias to a gate electrode embedded within the channel wall, tuning the surface charge in a region of the channel and subsequently altering ...
K.C. Koppenhoefer, S.Y. Yushanov, L.T. Gritter, J.S. Crompton, and R.O. Edwards
AltaSim Technologies LLC, Columbus, OH, USA
Cummins Fuel Systems, Columbus, IN, USA
Reynolds equation is used to analyze fluid flow through small gaps. As such, the solution of Reynolds equation provides critical information for a wide range of tribological problems. In any case where a lubricant resides between two moving surfaces, the Reynolds equation can be used to solve for the flow. In the case considered in this paper, lubricant flows between a piston and housing forced ...
Coupling Heat Transfer in Heat Pipe Arrays with Subsurface Porous Media Flow for Long Time Predictions of Solar Rechargeable Geothermal Systems
P. Oberdorfer, R. Hu, M. Azizur Rahman, E. Holzbecher, M. Sauter, P. Pärisch
Applied Geology, Geoscience Centre, University of Göttingen, Göttingen, Germany
Institute for Solar Energy Research Hameln/Emmerthal (ISFH), Emmerthal, Germany
An increased share of renewable energies is regarded as an integral part of a strategy towards a sustainable future. With regard to the heat supply sector this may be achieved using solar thermal collectors or heat pump systems with borehole heat exchangers. During the last years solar thermal and geothermal systems have generally been installed separately. Now, several proposals are discussed ...
M. Bottarelli , M. Bortoloni , G. Dino ,
 University of Ferrara, Ferrara, Italy
In climates with high temperature and solar radiation, reducing the cooling consumption and increasing the standards of indoor comfort are topics of great importance. The roof plays a key role in controlling the indoor thermal comfort. In ventilated roofs, air flow within the ASV (Above Sheathing Ventilation) depends on the air entering and leaving at the eaves and the ridge, according to ...
F. Mansilla, L. Voisin 
Advanced Mining Technology Center, Chile University, Santiago, Chile
Department of Mining Engineering, Advanced Mining Technology Center, Chile University, Santiago, Chile
Throughout history, the copper pyrometallurgical processes have been carried out mostly in discontinuous or batch systems. In recent decades new continuous technologies have been developed but focused only on Smelting and Converting stages leaving aside the Refining one. In 2002 a novel technology was proposed by the Department of Mining Engineering of Chile University which consists in two ...
Thermal Study of Valve Regulated Lead Acid Batteries and Electronics Chamber Used in Stand-Alone Street Lighting Applications - new
D. Groulx, J. Skaalum, T. Jamieson
Mechanical Engineering, Dalhousie University, Halifax, NS, Canada
This paper presents a study on the heat generation of Valve-Regulated Lead Acid (VRLA) batteries used in off-grid streetlighting applications from PoleCo, a Halifax based company. One goal of the project was to produce validated COMSOL® models of the enclosure that holds these VRLA batteries. This model can then be used to investigate methods of reducing the temperature of the batteries based on ...
M. Hashiguchi ,
 Keisoku Engineering System Co., Ltd., Chiyoda-ku, Tokyo, Japan
Vortex ring can be useful to generate thrust force for e.g., jellyfish, but its mechanism has not been clarified. In this field, it seems that numerical simulation has an important role of understanding the propulsion mechanism of creature. A vortex ring in a tube, refered to confined vortex ring, have been far less studied compared with unconfined vortex rings, despite their importance for many ...
F. Alzahrani, F. Aiouache
Engineering Department, Lancaster University, Lancaster, UK
This work used the 3D CFD modeling to investigate non-uniform deactivation in packed bed reactors of low aspect ratios under steady state and dynamic operations. In order to explore the effects of condition of instability on local deactivation, detailed knowledge of flow dynamics (i.e. local structure of the packed bed, pressure drops and interstitial flow in the void space), heat and mass rate ...