Droplet size dependence upon volume expansion rate

1999 ◽  
Vol 111 (6) ◽  
pp. 2842-2843 ◽  
Author(s):  
Wm. T. Ashurst ◽  
Brad Lee Holian
Keyword(s):  
Droplet Size ◽  
Volume Expansion ◽  
Size Dependence ◽  
Expansion Rate ◽  
Volume Expansion Rate

Influence of Zinc Particles on Oxidation Resistance of Diamond/Borosilicate Glass Composites

2011 ◽  
Vol 175 ◽  
pp. 8-12
Author(s):  
Yan Hui Wang ◽  
Xiang Hong Zhang ◽  
Jian Bing Zang ◽  
Xiao Zhe Cheng ◽  
Jin Hui Zhang
Keyword(s):  
Borosilicate Glass ◽  
Volume Expansion ◽  
Bending Strength ◽  
Expansion Rate ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Glass Composites ◽  
Zn Content ◽  
Strength Tests ◽  
Volume Expansion Rate

Oxidization of diamond in the sintering process of diamond/borosilicate glass composites would result in low compressive fracture strength (CFS) of the grit and uncontrolled expansion with many irregular pores in the composites, causing low bending strength of the tools. In this paper diamond/borosilicate glass composites were prepared by cold pressing and sintering at 850 C for 120 min in air. An active element Zn was incorporated into the composites in order to resolve the above issues. The effects of Zn contents on the properties of the composites was investigated by the bending strength tests, the volume expansion rate tests, differential scanning calorimeter test (DSC), thermogravimetry (TG), X-ray diffraction analysis (XRD), and scanning electron microscope (SEM). The results showed Zn was oxidized and then converted to ZnAl2O4 and Zn2SiO4 phases during sintering. The bending strength improved and the expansion phenomenon was inhibited for the composites with various Zn additions. The maximum bending strength and minimum volume expansion rate were obtained for the composite GZ8. This Zn content resulted in a decrease of volume expansion rate from 8.57% to -20.53%, and an increase in bending strength from 28.49 MPa to 74.02 MPa compared with the composite GZ0. The CFS results of the diamond grits separated from GZ0 and GZ8 was 21N and 26N, respectively.

Droplet-size dependence of the electron transfer rate across the single-microdroplet/water interface

1995 ◽  
Vol 237 (1-2) ◽  
pp. 133-136 ◽  
Author(s):  
Kiyoharu Nakatani ◽  
Katsumi Chikama ◽  
Haeng-Boo Kim ◽  
Noboru Kitamura
Keyword(s):  
Electron Transfer ◽  
Droplet Size ◽  
Transfer Rate ◽  
Size Dependence ◽  
Water Interface ◽  
Electron Transfer Rate

Dependence of Shock Characteristics on Droplet Size in Supersonic Two-Phase Mixtures

1980 ◽  
Vol 102 (1) ◽  
pp. 54-58 ◽  
Author(s):  
W. J. Comfort ◽  
C. T. Crowe
Keyword(s):  
Shock Waves ◽  
Droplet Size ◽  
Size Dependence ◽  
Supersonic Nozzle ◽  
Mass Effect ◽  
Normal Shock ◽  
Virtual Mass ◽  
Two Phase ◽  
Phase Mixture ◽  
Phase Normal

In a dispersed two-phase flow, the mixture chokes at a velocity well below the vapor choking velocity, as shown by the velocity at the throat of a converging-diverging, two-phase, supersonic nozzle. The formation and abruptness of a normal shock wave in a two-phase mixture depends strongly on the coupling between phases, particularly upon droplet size. As droplet size becomes small, the mixture behaves as a continuum, and sharp discontinuities can occur at velocities above the two-phase choking velocity but below the vapor sonic velocity. An approximate analysis is performed to incidate the droplet size at which continuum behavior might be expected to occur. A numerical model, which includes the drag, buoyancy, Basset force, and the force associated with the virtual mass effect, is used to show droplet-size dependence in two-phase normal shock waves. For the examples presented, continuum behavior apparently is approached at droplet diameters between 1 and 2 μm, even through normal shock waves.

Hydration and Expansion Properties of Novel Concrete Expansive Agent

2009 ◽  
Vol 405-406 ◽  
pp. 267-271
Author(s):  
Pei Wei Gao ◽  
Fei Geng ◽  
Xiao Lin Lu
Keyword(s):  
Particle Size ◽  
Volume Expansion ◽  
Curing Temperature ◽  
Expansion Rate ◽  
The Novel ◽  
Expansive Agent ◽  
Novel Agent

The hydration and expansive characterization of a novel concrete expansive agent were investigated in this paper. The results showed that the hydration activities of the novel agent depended on the calcining temperature, particle size and curing temperature. When the expansive agent was mixed in concrete, the early shrinkage of concrete was reduced. If the content and distribution of the expansive agent in concrete is appropriate and uniform, the expansion rate of concrete may be controlled, and the shrinkage of concrete could be compensated effectively by the gentle volume expansion.

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