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+ cupola 5 Rotational grids 5.1 Mathematical calculations Based on the vault tool two types of rotational grid tools are also created. These components transform a grid given in Cartesian coordinate system to cover a surface of revolution. The generating

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Introduction Left ventricular (LV) twist is considered an essential part of LV function due to oppositely directed LV basal and apical rotation [ 8, 11 ]. Non-invasive techniques such as magnetic resonance imaging and three-dimensional (3D) speckle

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-term durability of jasper and greenstone by LA tests; the samples were subjected to different numbers of rotations. The alteration of the slake durability index (Id), according to increasing number of test cycles of Dalmatian (Croatia) marls ( Miščević and

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Pepó, P., Vad, A., Berényi, S. 2008. Effects of irrigation on yields of maize ( Zea mays L.) in different crop rotations. Cereal Res. Commun. 36 :735–738. Berényi S. Effects of

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rotating sample is pressed against a stationary sample as shown in Fig. 1(a and b) . The friction at the interface generates the welding heat, which upset the samples ( Fig. 1c ). Finally, the rotation stops and a forging pressure is introduced to achieve

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different temperatures 40–42–44–46–48–50 °C. The shear stress of the sample was measured with Z10 DinTi type conical end stainless steel cylinder by Haake RotoVisco1 rotational viscometer at the actual melting temperature, and the viscosity was determined

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International Review of Applied Sciences and Engineering
Authors: Olena Yakymchuk, Dmytro Yakymchuk, Nataliia Bilei-Ruban, Iryna Nosova, Serhiy Horiashchenko, Kostyantyn Horiashchenko, Tetyana Kisil, and Viacheslav Tuz

nozzle; engine drive; pump for LAWE pulling out; tachometer; system of displacement and orientation of a nozzle; LAWE pressure control unit; control unit for shaft rotation speed with a part; PC; power supply unit microcontroller. The semi

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Progress in Agricultural Engineering Sciences
Authors: Tamás Csurka, Klára Pásztor-Huszár, Adrienn Tóth, Richárd Pintér, and László Ferenc Friedrich

progress . FAO , Rome . Mekonnen , M.M. and Hoekstra , A.Y. ( 2010 ). The green, blue and grey water footprint of farm animals and animal products . Volume 2: Appendices . Mezger , T.G. ( 2006 ). The rheology handbook: for users of rotational

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Denitrification is a key process in wastewater treatment since it is responsible for the effective nutrient removal. It requires anoxic conditions, where only chemically bound nitrogen is used as an oxygen source, and no aeration is applied. In suspended biomass systems the growth and homogenization of biomass is essential, high degree of mixing is required, which is achieved only by using mechanical mixers. Mechanical mixing performance relies on the mixing power determined by the equipment dimensions and rotational speed. In this paper the effect of three different rotational speed (rpm: 100, 400, 900 min-1) on flow field and mixing conditions are evaluated. As a result of the simulations, the acceptable flow field was achieved at 400 rpm. The outcome of this research is that the high degree of energy transfer from mixers to fluid flow deteriorated mixing efficiency.

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In the present paper, CFD simulation is used to perform the numerical calculation of behaviours of multi-blade drag typed VAWT. The sliding grid technology, FLUENT software and PISO algorithm are involved. By taking wind power efficiency C p as the goal function, the optimal situations of multi-blade drag typed VAWT with 4 and 6 blades are conducted by CFD simulation. In this investigation, the variable parameters include the rotation rate of wind-mill ω, the blade installation angle θ and the blade width d. The results show that: the optimal working conditions for the 4-blade wind mill at the inlet wind speed 8 m/s are ω = 18 r/ min, θ = 28°, and d = 0.83 m, which induces an optimal wind power efficiency rate C p = 27.127%; the optimal working conditions for the 6-blade wind mill at the inlet wind speed 8 m/s are ω = 18 r/min, θ = 27°, and d = 0.67 m, which leads to an optimal wind power efficiency rate C p = 30.404%.

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