Experimental and theoretical analysis of TiO2 powders flow properties at ambient and high temperatures

AbstractThe nozzle admittance is very important in the theoretical analysis of nozzle damping in combustion instability. The linearized Euler equations (LEE) are used to determine the nozzle admittance with consideration of the mean flow properties. The acoustic energy flux through the nozzle is calculated to evaluate the nozzle damping upon longitudinal oscillation modes. Then the parametric study, involving the nozzle convergent geometry, convergent half angle and nozzle size, is carried out. It is shown that the imaginary part of the nozzle admittance plays a non-negligible role in the determination of the nozzle damping. Under the conditions considered in this work (

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Grain Boundary Roughening Transition

Materials Science Forum ◽

10.4028/www.scientific.net/msf.467-470.825 ◽

2004 ◽

Vol 467-470 ◽

pp. 825-834 ◽

Cited By ~ 4

Author(s):

Duk Yong Yoon ◽

Young Kyu Cho ◽

Hyun Min Jang

Keyword(s):

Molecular Dynamics ◽

Theoretical Analysis ◽

Grain Boundary ◽

Molecular Dynamics Simulations ◽

Grain Boundaries ◽

High Temperatures ◽

Flat Surfaces ◽

Roughening Transition ◽

Entropy Effect ◽

Dynamics Simulations

Flat surfaces and grain boundaries lying on low crystal planes are singular corresponding to the cusps in the polar (Wulff) plots of their energy against their orientation. The theoretical analysis of the entropy effect at high temperatures shows that these interfaces undergo roughening transitions. The molecular dynamics simulations also show disordering to liquid-like structures at high temperatures that can be interpreted as the roughening transition. Experimentally, singular flat surfaces and grain boundaries become curved at high temperatures or with additives, indicating their roughening transition. The grain boundaries in polycrystals are often faceted with hill-and-valley shapes and their defaceting at high temperatures also show their roughening transition.

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A new rheometer for direct measurement of the flow properties of coal ash at high temperatures

Fuel ◽

10.1016/s0016-2361(01)00175-2 ◽

2002 ◽

Vol 81 (4) ◽

pp. 397-404 ◽

Cited By ~ 16

Author(s):

N. Tonmukayakul ◽

Q.D. Nguyen

Keyword(s):

Direct Measurement ◽

High Temperatures ◽

Coal Ash ◽

Flow Properties

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Research on the Polymer Ultrasonic Plastification

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.87-88.542 ◽

2009 ◽

Vol 87-88 ◽

pp. 542-549 ◽

Cited By ~ 4

Author(s):

Bing Yan Jiang ◽

Jian Liang Hu ◽

Wang Qing Wu ◽

Shu Ye Pan

Keyword(s):

Theoretical Analysis ◽

Injection Molding ◽

Ultrasonic Vibration ◽

Melt Flow ◽

Flow Properties ◽

Micro Injection Molding ◽

Vibration Field ◽

Micro Cavity

Melt flow properties in micro cavity play an important role in the micro injection molding (MIM). Based on the point view of improving the melting plastification quality, this study focus on solving the problem of melt filling difficulty in micro cavity of MIM by introducing the ultrasonic vibration field into the polymer plastification process. This paper studied the polymer’s ultrasonic plasitfication process by Theoretical analysis and Polymer ultrasonic plastification experiment.

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