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Title: On the Hydrodynamics Turbulent Control of Mass Transfer in Electrodeposition Process
Author(s): Harinaldi
Pages: 1-7 Paper ID: 113301-5656 IJMME-IJENS Published: February, 2011
Abstract: A wall-slit jet serves as a mean of hydrodynamics control for turbulence of an electrolyte flow in a backstep channel equipped with electrochemical cells to improve mass transfer of an electrodeposition process. Experimental and computational works were done to elucidate the effect of flow parameters to the rate of mass transfer between cell electrodes. The solution of CuSO4 of 0.5 M was used as electrolyte fluid. The rate of mass transfer was determined by measuring the local limiting current at mini cathodes placed in the electrochemical cell. Some results showed that the wall-slit jet altered the flow structure and turbulence intensity. The reattachment point shifted to upstream position, the recirculation zone reduced in size meanwhile the turbulence intensity increased. These flow characteristics altered the rate of convective ionic mass transfer. Within the range of Reynolds number 1500 < Re < 4800 and velocity ratio of 0.7 < Vr < 2.6 it is found the mass transfer relation can be presented a non-dimensional equation of Sh = 0.033Re 0.598 Sc 0.33 , where Sh is the Sherwood number and Sc is the Schmidt number of the flow.
Keywords: Turbulence control, wall-slit jet, backward facing step, convective mass transfer, electrodeposition process.
Full Text (.pdf)  International Journals Of Engineering and Science| 734 KB
Title: Design, Simulation and Experimental of the Very Low Head Turbine with Minimum Pressure and Free Vortex Criterions
Author(s): Priyono Sutikno, Ibrahim Khalil Adam
Pages: 9-16 Paper ID: 113701-2828 IJMME-IJENS Published: February, 2011
Abstract: This research was carried out in order to develop a hydro turbine to be used for specific site of lower Head as run of river, which has head less than 1.2 meters. The new development of Very Low Head Turbine has been done in this research use the simple civil construction and resulting the economically viable. The recent development of computer-based tools with more efficient algorithms has allowed a substantial improvement in hydraulic turbine design. The definition of an initial geometry capable to assist certain characteristics of turbine performance is a first step for useful numerical turbine analysis. This paper presents an application of the minimum pressure coefficient and free vortex criterions for axial-flow hydraulic turbines cascade geometry design. The criterion was tested for VLH turbine and it was showed that it is suitable to define the initial geometry for machine design. The grid of the simulation domain was generated with GAMBIT grid software package and the results were obtained using the commercial package Navier Stokes 3-D FLUENT flow to analyze the fluid flow through blade runner. Using this procedure, a study was carried out on a small axial-flow turbine, specifically designed to operate in a Very Low Head. Finally, the results are evaluated to hydraulic efficiency prediction of blade runner turbines. The result of simulation has efficiency of 90% and produced the power of 2071 Watt at rotational speed 180 rpm and torque is 219.79 N-m, at the flow rate of 293.15 l/s. The prototype of turbine system was tested in Laboratory by using small channel system that we made it inside the laboratory. The tested result was obtained maximum efficiency of 90% and the power output simulation and experimental has the differential less than 5% at 200 rpm.
Keywords: Very Low Head Turbine, Minimum Pressure Coefficient Criterion, Free Vortex Design, Numerical Simulation, and Experimental.
Full Text (.pdf)  International Journals Of Engineering and Science| 652 KB
Title: Design and Blade Optimization of Contra Rotation Double Rotor Wind Turbine
Author(s): Priyono Sutikno, Deny Bayu Saepudin
Pages: 17-26 Paper ID: 115301-7474 IJMME-IJENS Published: February, 2011
Abstract: The Intelligent Wind turbine (IWT) has two stages blades contra rotation. This kind of wind turbine has characteristic self regulated on the speed due to the difference torque between two stages horizontal axis wind turbine, than no need the pitch controller to control the speed and cut off the wind turbine due to the high wind speed. The research of IWT is designed first by optimize several important design parameters, as a blade section profile and the multiplier factor of the angle of attack. The design parameter results are the NACA 6412 is selected as the optimum blade section profile and the optimum value of angle of attack multiplier factor is 0.5. The designed IWT has 3 blades for each front and rear rotor. The research intelligent wind turbine has 600 mm front diameter and 600 mm rear blade diameter. The characteristics of IWT were simulated by using Computational Fluid Dynamic (CFD) software, demonstrated the non entrainment of the contra rotation, each blades should have the same produced torque.
Keywords: Intelligent Wind Turbine, Numerical Simulation, Contra rotation Wind Turbine.
Full Text (.pdf)  International Journals Of Engineering and Science| 1,229 KB
Title: Peristaltic transport of micropolar fluid in a tubes under influence of rotation
Author(s): A. M. Abd-Alla, G. A. Yahya, H. S. Al :Osaimi
Pages: 27-36 Paper ID: 101806-1101-7171 IJMME-IJENS Published: February, 2011
Abstract: In this paper, The peristaltic flow of micropolar fluid in a flexible tube with viscoelastic is studied under effect of rotation. The Runge-Kutta method is developed to solve the governing equations of motion resulting from a perturbation technique for small values of amplitude ratio. The time mean axial velocity profiles are presented for the case of free pumping and analyzed to observe the influence of rotation for various values of Reynolds number, wave number and radial of cylinder. The results indicate that the effect of rotation is very pronounced. The obtained results are also compared with those available in the literature in case of waves in cylindrical tubes in the absence of rotation. Numerical results are given and illustrated graphically.
Keywords: Peristaltic motion, Micropolar fluid, Perturbation technique, Velocity profiles, Rotation.
Full Text (.pdf)  International Journals Of Engineering and Science| 819 KB
Title: A human centered control strategy for a driving simulator
Author(s): A. Capustiac, B. Hesse, D. Schramm, D. Banabic
Pages: 37-44 Paper ID: 1110001-8989 IJMME-IJENS Published: February, 2011
Abstract: Driving simulators are used in the automotive industry to prove new systems and evaluate the driver’s behaviour and interaction with the vehicle. The DRIVASSIST simulators combine haptic, visual and acoustic cues in order to immerse the driver into a sufficient degree of realism. The goal of this paper is to present aspects concerning the simulation and validation of a control strategy for a motion driving simulator which includes the dynamical models of the human vestibular system. It is proved that by introducing the motion perception of the driver, the workspace required for actuating the driving simulator is reduced.
Keywords: Driving simulators, vestibular system, real time simulations, control.
Full Text (.pdf)  International Journals Of Engineering and Science| 681 KB
Title: The Effect of Sliding Speed and Normal Load on Friction and Wear Property of Aluminum
Author(s): M. A. Chowdhury, M. K. Khalil, D. M. Nuruzzaman, M. L. Rahaman
Pages: 45-49 Paper ID: 111701-6868 IJMME-IJENS Published: February, 2011
Abstract: The present paper investigates experimentally the effect of sliding speed and normal load on friction and wear property of an aluminum disc sliding against stainless steel pin. To do so, a pin-on-disc apparatus was designed and fabricated. Experiments were carried out under normal load 10-20 N, speed 500-2500 rpm and relative humidity 70%. Results show that the friction coefficient decreases with the increase of sliding speed and normal load for aluminum. Itis also found that the wear rates increase with the increase of sliding speed and normal load.
Keywords: Friction Coefficient,Normal Load, Sliding Speed, Wear Rate.
Full Text (.pdf)  International Journals Of Engineering and Science| 266 KB