scholarly journals Source duration of stress and water-pressure induced seismicity derived from experimental analysis ofPwave pulse width in granite

2013 ◽  
Vol 40 (14) ◽  
pp. 3567-3571
Author(s):  
Koji Masuda
Keyword(s):  
Experimental Analysis ◽  
Induced Seismicity ◽  
Pulse Width ◽  
Water Pressure ◽  
Source Duration

scholarly journals Experimental Analysis of Water Pressure and Temperature Influence on Atomization and Evolution of a Port Water Injection Spray

2021 ◽  
Vol 11 (13) ◽  
pp. 5980
Author(s):  
Lucio Postrioti ◽  
Gabriele Brizi ◽  
Gian Marco Finori
Keyword(s):  
Water Temperature ◽  
Experimental Analysis ◽  
Water Pressure ◽  
Direct Injection ◽  
Water Injection ◽  
Injection Pressure ◽  
Gasoline Direct Injection ◽  
Water Evaporation ◽  
Brake Mean Effective Pressure ◽  
Temperature Levels

Port water injection (PWI) is considered one of the most promising technologies to actively control the increased knock tendency of modern gasoline direct injection (GDI) engines, which are rapidly evolving with the adoption of high compression ratios and increased brake mean effective pressure levels in the effort to improve their thermal efficiency. For PWI technology, appropriately matching the spray evolution and the intake system design along with obtaining a high spray atomization quality, are crucial tasks for promoting water evaporation so as to effectively cool down the air charge with moderate water consumption and lubricant dilution drawbacks. In the present paper, a detailed experimental analysis of a low-pressure water spray is presented, covering a lack of experimental data on automotive PWI systems. Phase doppler anemometry and fast-shutter spray imaging allowed us to investigate the influence exerted by the injection pressure level and by the water temperature on spray drop size and global shape, obtaining a complete database to be used for the optimization of PWI systems. The obtained results evidence how significant benefits in terms of atomization quality can be obtained by adopting injection pressure and water temperature levels compliant with standard low injection pressure technologies.

The growth of mica polytypes as studied by conventional and high-resolution TEM

1983 ◽  
Vol 41 ◽  
pp. 174-177
Author(s):  
A. Baronnet ◽  
M. Amouric
Keyword(s):  
Water Pressure ◽  
Point Of View ◽  
Temperature Fields ◽  
Natural Occurrence ◽  
Growth Mechanisms ◽  
Long Period ◽  
High Resolution Tem ◽  
Layer Stacking ◽  
Experimental Works ◽  
Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

Fluid-Induced Seismicity

2015 ◽  
Author(s):  
Serge A. Shapiro
Keyword(s):  
Induced Seismicity
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