• Journal of the Society of Cosmetic Scientists of Korea
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• v.19 no.1
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• pp.85-107
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• 1993

The cosmetic fine powders were mixed with variation of mixing time(5) in the mixers (ribbon mixer, powder mixer, micropulverizer and fine impact mill). The powders were nixed with small amount of ferric oxide. as tracer. The mixed powders ere measured the particle size distribution, specific surface area and surface color with mixing time (s). The color variation, particle size distribution and specific surface area of the mixed powder exist a relationship with mining time(s) that can be expressed as mathematical equations to show the degree of the mixing of the powder mixture. The linear velocity of the impellar tip is the main factor contributing to he mixing efficiency of the mixers un this study. According to the linear velocity, he mixers used are devieded as convection mixing (ribbon mixer), sclera mixing powder mixer) and diffusion mixing (micropulverizer/fine impact mill).

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.29 no.1
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• pp.62-72
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• 1997

• Journal of Advanced Marine Engineering and Technology
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• v.31 no.6
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• pp.797-803
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• 2007

The Industrial Mixers are used in various industrial fields where they are necessary to intimately mix two reactants in a short Period of time. However. despite their widespread use, complex unsteady flow characteristics of industrial mixers are not systematically investigated. The present study aims for clarify unsteady flow characteristics Induced by various impellers in a tank. Impellers are pitched blade turbine(PBT) types, Screw type and Rushton turbine type. In this study choice of the industrial mixer's impeller type using PIV and CFD method. The rotating speed of impellers are fixed by 100RPM.

• Proceedings of the KSME Conference
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• 2002.08a
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• pp.627-630
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• 2002

In the present study a mesh generation program is developed for the flow analysis of industrial mixers. With this program one can select various design parameters such as impeller types, vessel type, number of baffles, number of blades, blade pitched angle, stages of impeller, rotational speed etc. Post processing capabilities are also imbedded in the program. Along with brief explanation of the program, examples of flow simulation for various type of mixers by using the program are also presented to show effectiveness of the program. It is expected that this program can be used to understand the effect of design parameters on the performance of particular type of the mixer, and hence to achieve the optimal design.

• Journal of Advanced Marine Engineering and Technology
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• v.30 no.3
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• pp.413-419
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• 2006

The Industrial Mixers are used in various industrial fields where they are necessary to intimately mix two reactants in a short period of time. However, despite their widespread use, complex unsteady flow characteristics of industrial mixers are not systematically investigated. The present study aims for clarify unsteady flow characteristics induced by various impellers in a tank. Impellers are pitched blade turbine(PBT) types. Screw type and Rushton turbine type. In this study choice of the Industrial Mixer's Impeller type for distribution of concentration and PIV measurement method. The rotating speed of impellers are fixed by 100RPM.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.11a
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• pp.336.1-336
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• 2002

Recently, mixers are being widely used in the water purification plant in order to increase the filtration efficiency. The cause of an excessive vibration of a base structure to which the mixers are supported, has been evaluated through modal analysis on the mixer shaft and vibration measurements during operation. The fundamental natural frequency of the mixer shaft is found to be around 1.8 Hz and the main vibratory frequency around 30 Hz. (omitted)

• Journal of Electrical Engineering and Technology
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• v.5 no.3
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• pp.497-502
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• 2010

In this paper, the O-mode ultrashort-pulse reflectometry (USPR) millimeter-wave signals that propagate into the plasma and cover a frequency bandwidth of 33-158 GHz are examined numerically using MATLAB. Two important processes are involved in the computation: the propagation of the USPR impulse signal through a waveguide and the frequency up-conversion using millimeter-wave mixers. These mixers are limited to intermediate frequency signals that are less than 500 mV; thus, it is necessary to disperse the impulse signal into a chirped waveform using the waveguide. The stationary phase method is utilized to derive a closed-form formula for a chirped waveform under the assumption that the USPR impulse is Gaussian. In the process of frequency up-conversion, the chirped waveform is mixed with the mixer LO signal, and the lower frequency components of the RF signal are removed using high pass filters.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2007.04a
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• pp.197-200
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• 2007

This paper presents solid propulsion manufacturing processes. Solid rocket motors propellants are made of several batches of propellant being mixed in mixers and made of continuous mixers. This paper discusses the technology of continuous mix process of Aerojet, US and SNPE Materiaux Energetiques, France.

• Journal of the Korean Institute of Telematics and Electronics T
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• v.35T no.1
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• pp.22-28
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• 1998

A new type of FET source mixer with a single bias voltage has been presented. It is designed to operate at Vds=0 [V] with only one positive supply voltage, which makes mixer circuits simple. The proposed mixer has shown improved stability and less sensitivity to both bias and LO power compared with conventional active mixers. It also shows lower conversion loss than that of diode mixers. The minimum conversion loss measured at RF frequency of 5.6㎓ is 0.6㏈ for a LO frequency of 5.8㎓.

• Journal of the Korean Society for Precision Engineering
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• v.25 no.6
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• pp.143-149
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• 2008

This paper presents the results of the study on the novel micro mixer. Existing micro mixer is classified as active mixing and passive mixing by the mixing principles. Both mixing principles have problems. For solving these problems, this research has developed the novel micro mixers based on a totally different principle compared with former mixers. They not only have a simpler structure than former ones but also are able to achieve high mixing efficiency in spite of low power consumption due to using Lorentz Force. In addition, they are designed to increase the efficiency of mixing by changing the rotating direction of fluid with a polar switching circuit. Driving forces of the mixer are Lorentz force and a moving force of fluid due to electrophoresis. Because the efficiency of mixer is affected by electrode shape, several models have been made. The computer simulation has been made to estimate the efficiency of each mixer.