The Experts below are selected from a list of 123570 Experts worldwide ranked by ideXlab platform
Yimin Xuan - One of the best experts on this subject based on the ideXlab platform.
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enhanced optical absorption of the plasmonic nanoshell suspension based on the solar photocatalytic hydrogen production System
Applied Energy, 2014Co-Authors: Huiling Duan, Yimin XuanAbstract:The absorption properties of the random Al/CdS nanoshell Systems are simulated using the finite difference time domain (FDTD) method. The interactions between the nanoshells have been taken into account in the simulation. By comparing the optical absorption of Dispersion System with that of single nanoshell, it reveals that the inter-particle coupling cannot be neglected in the simulation of Dispersion System. The absorption enhancement is affected by both the inter-particle coupling and the localized surface plasmon resonance (LSPR) effect. The dispersed nanoparticles induce longer optical path inside the Dispersion System and enhance light trapping as well as absorption. It can be considered to increase the nanoshell concentration and reduce the particle size to obtain an enhanced absorption.
Wang Lei - One of the best experts on this subject based on the ideXlab platform.
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Gelling property evaluations of HPAM/AlCit colloidal Dispersion System and its effect on rock wettability
Materials Science and Technology, 2007Co-Authors: Wang LeiAbstract:A new colloidal Dispersion System(HPAM/Aluminium Citrate Colloidal Dispersion System,HACDS) made up of HPAM and Aluminium Citrate(AlCit) was prepared.The effect of HPAM concentration,the mass ratio of HPAM to AlCit and time on the gelling properties of HACDS was evaluated.The imbibition method was used to measure the wettability changes of rocks by injection of HACDS.Experiments show that the gelling time is getting shorter with the increase of HPAM concentration,the viscosity of HACDS increases with time going and the gelling time is related to the mass ratio of HPAM to AlCit.The injection of HACDS can change the wettability of cores.The wettability change is related to the injected volume of HACDS into the cores.The retention and adsorption of HACDS in the core are the main mechanisms for wettability change.
Shuji Matsusaka - One of the best experts on this subject based on the ideXlab platform.
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Particle electrification and levitation in a continuous particle feed and Dispersion System with vibration and external electric fields
Advanced Powder Technology, 2018Co-Authors: Mizuki Shoyama, Takumu Kawata, Masatoshi Yasuda, Shuji MatsusakaAbstract:Abstract Electrification and levitation of particles in a continuous particle feed and Dispersion System have been studied both theoretically and experimentally. This System consisted of a vibrator and inclined parallel electrodes. A mesh and a vibrating plate were used for the upper and lower electrodes, respectively. A dc voltage was applied to one of the electrodes and the other electrode was grounded. Particles fed to the lower electrode were charged by induction and levitated upward by the Coulomb forces. When the applied voltage was high enough, the particles passed through the mesh electrode. The charge of the particles was measured with a Faraday cup, and the particle behavior was observed with a high-speed microscope camera. The particle charges were also analyzed from experimentally obtained particle trajectories and numerically calculated electric fields. Finally, the conditions for the effective levitation and Dispersion of the charged particles and their mechanisms were studied and have been described in detail.
Esmaeil Najafiaghdam - One of the best experts on this subject based on the ideXlab platform.
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Design and implementation a microcontroller based high power ultrasonic Dispersion System with self frequency adjusting property
4th International Conference on Power Engineering Energy and Electrical Drives, 2013Co-Authors: Javad Abbaszadeh, Esmaeil Najafiaghdam, Herlina Abdul Rahim, Ruzairi Abdul Rahim, Sahar Sarafi, Abubakar SuleimanAbstract:In This paper a novel ultrasonic Dispersion System for the cleaning application or dispersing of particles which are mixed in liquid, has been proposed. The frequency band of designed System is 28 kHz so that the frequency of ultrasonic wave sweeps from 20 kHz to 30 kHz with 100 Hz steps. Transferring a maximum and optimum energy of ultrasonic wave to the liquid conveyor with high efficiency during total usage time is remarkable superiority of designed and manufactured System compares with other similar available Systems in markets. High power ultrasonic transducers with the nominal maximum power 110 watt are applied as the ultrasonic wave generator. To increase the efficiency of System and transmitting the maximum energy to the liquid tank, the frequency of System should set on the resonance frequency of transducer. Control section is implemented in System for realtime monitoring and adjusting the frequency of System. Hall Effect current sensor is used as the current sampling component and controlling program is implemented on AVR microcontrollers. The manufactured ultrasonic Dispersion System is consisted of 4 high power ultrasonic transducer result in 450 watt ultrasonic energy, effectively.
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INCREASING THE EFFICIENCY OF ULTRASONIC Dispersion System WITH USE OF CONTROL LOOP TO AUTOMATIC FREQUENCY ADJUSTING
International Journal on Smart Sensing and Intelligent Systems, 2011Co-Authors: Javad Abbaszadeh, Esmaeil Najafiaghdam, H. Abdul Rahim, R. Abdul Rahim, S. SarrafiAbstract:A novel ultrasonic Dispersion System for the dispersing of particles which are mixed in liquid has been proposed in this paper. The frequency of produced ultrasonic wave varies from 30 kHz to 60 kHz with 100 Hz steps. It means that the operating frequency band of designed System is 30 kHz. The maximum and optimum energy of ultrasonic wave can be transfer inside the liquid container with the high efficiency in majority of operating time by the use of some facilities which are implemented in our novel System, so it causes one of the superiority of manufactured System in compare with the other similar Systems which are available in markets. Ultrasonic transducers which are used in this System as the generator of ultrasonic wave is the type of air coupled ceramic ultrasonic piezoelectric with the nominal maximum power 50 watt. By the considering of frequency diagram of applied piezoelectric, it can be find out that the piezoelectrics produce the maximum amplitude of ultrasonic wave on their resonance frequency, so this System is designed to work on resonance frequency of piezoelectric, continuously. This is done by the use of control System which is consisted of two major parts, sensing part and controlling part. A Hall Effect current sensor is used as the sensing part and the controlling program is implemented on AVR microcontrollers. In addition, the control algorithm of program is presented in this paper. The manufactured ultrasonic Dispersion System has been consisted of 9 piezoelectrics so that it can produce 450 watt ultrasonic energy, totally.
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Ultrasonic Dispersion System design and optimization using multiple transducers
2009 Symposium on Piezoelectricity Acoustic Waves and Device Applications (SPAWDA 2009), 2009Co-Authors: Javad Abbaszadeh Bargoshadi, Esmaeil NajafiaghdamAbstract:Ultrasonic wave can be widely used in different steps of nonomaterial synthesizing processes. The most obvious is dispersing of materials in liquids in order to break particle agglomerates. Known types of Systems which are used to this purpose, composed of a liquid tank and a high power ultrasonic generator. In this paper, an ultrasonic Dispersion System has been proposed and designed with new method of particle dispersing strategy. The main advantage of the proposed is decreasing Dispersion time and increasing the particles size uniformity. It assumed that the mix of particles and liquid medium is passing through a cubical pipe. Suitable number of transducers embedded on one side of the pipe with optimum distance from each other, so that the ultrasonic intensity can be focused on some cavitations zones to stimulate Dispersion function gradually. Evaluating of the optimum placement of transducers is calculated and simulated using FEMLAB package (COMSOL multi-physics 3.4). The ultrasound intensity profile is obtained from the pressure field distribution. This provides a prediction across the geometry of active cavitations zones, which are crucial for the optimization of the transducers placing. The results can then be used to increase Dispersion Systems efficiency in a real time controlled application. Simulation results show a better performance compared to the conventional methods.
Abdul Aziz Abdul Raman - One of the best experts on this subject based on the ideXlab platform.
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Experimental Investigations in Liquid–Liquid Dispersion System: Effects of Dispersed Phase Viscosity and Impeller Speed
Industrial & Engineering Chemistry Research, 2014Co-Authors: Mohd Izzudin Izzat Zainal Abidin, Abdul Aziz Abdul RamanAbstract:Experimental investigation was conducted on a liquid–liquid Dispersion in a stirred vessel in which the effects of dispersed phase viscosity were studied. Different grades of silicone oils were used to create oil-in-water Dispersion by using Rushton turbine as an impeller, and drop sizes were measured by laser diffraction technique. Dispersion with higher uniformity of drop sizes was produced at low viscosity and high impeller speed. The dispersed phase viscosity influenced the equilibrium Sauter mean diameter, d32 by contributing to drops stabilization. The decrement of d32 with an increase in impeller speed is larger for high dispersed phase viscosities. It shows the influence of number and size of drop fragments formed after drop breakup on the mean drop size. Correlations relating d32 and dispersed phase viscosity were proposed with an accuracy of more than 90% between the predicted and experimental values.
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experimental investigations in liquid liquid Dispersion System effects of dispersed phase viscosity and impeller speed
Industrial & Engineering Chemistry Research, 2014Co-Authors: Mohd Izzudin Izzat Zainal Abidin, Abdul Aziz Abdul Raman, Mohamad Iskandr Mohamad NorAbstract:Experimental investigation was conducted on a liquid–liquid Dispersion in a stirred vessel in which the effects of dispersed phase viscosity were studied. Different grades of silicone oils were used to create oil-in-water Dispersion by using Rushton turbine as an impeller, and drop sizes were measured by laser diffraction technique. Dispersion with higher uniformity of drop sizes was produced at low viscosity and high impeller speed. The dispersed phase viscosity influenced the equilibrium Sauter mean diameter, d32 by contributing to drops stabilization. The decrement of d32 with an increase in impeller speed is larger for high dispersed phase viscosities. It shows the influence of number and size of drop fragments formed after drop breakup on the mean drop size. Correlations relating d32 and dispersed phase viscosity were proposed with an accuracy of more than 90% between the predicted and experimental values.
