Conditions for the applicability of the geometrical similarity law to impulse breakdown in gases

2010 ◽  
Vol 17 (4) ◽  
pp. 1185-1195 ◽  
Author(s):  
Sasa Dekic ◽  
Predrag Osmokrovic ◽  
Milos Vujisic ◽  
Koviljka Stankovic
Keyword(s):  
Geometrical Similarity ◽  
Similarity Law

Criteria for Outward Curling of Tubes

1993 ◽  
Vol 115 (4) ◽  
pp. 466-471 ◽  
Author(s):  
K. Kitazawa
Keyword(s):  
The Other ◽  
Geometrical Similarity ◽  
Other Hand ◽  
Die Surface ◽  
Bending Radius ◽  
Similarity Law

The criteria for outward curling of circular metal tubes have been investigated experimentally and theoretically. The results are summarized as follows: (1) The critical bending radius, ρc exists. When the bending radius at die inlet ρ is larger than the ρc, the tube end fits well on the die surface. On the other hand, when ρ ≤ ρc, the tube end separates from the die surface and curling occurs. (2) It is found that there is a geometrical similarity law of the ρc. The ρc increases with increasing die angle. Furthermore, it is also clarified that the ρc is independent of the tube materials and lubrication.

Integral Modeling of a Twin-Screw Compressor

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Sarah Van Erdeweghe ◽  
Joris De Schutter ◽  
Eric Van den Bulck
Keyword(s):  
Working Conditions ◽  
Control Volume ◽  
Optimization Procedure ◽  
Future Research ◽  
Screw Compressor ◽  
Positive Displacement ◽  
Rotor Profile ◽  
Twin Screw ◽  
Large Application ◽  
Similarity Law

In this paper, an integral methodology for the modeling of a twin-screw compressor is presented. Starting from a known rotor profile, all the algorithms to calculate the second rotor profile, the size of the control volume, and the compressor's performance are presented. The proposed modeling approach can be applied in an optimization procedure to find the optimal rotor profiles for a given application, with corresponding working conditions. Furthermore, based on the modeling results and substantiated with measurements on different compressor types, a similarity law for positive displacement compressors seems to exist. The existence of a similarity law has large application potential as it could be used to predict the performance of a positive displacement compressor in other than the (lab) tested working conditions. Further investigation of the similarity law for positive displacement compressors is therefore proposed as a key topic for future research.

A simple similarity law of conical shock wave

1994 ◽  
Author(s):  
Liao Jinhua ◽  
Deng Xueying
Keyword(s):  
Shock Wave ◽  
Conical Shock ◽  
Similarity Law

scholarly journals On the Scaling of Bubble Cluster Collapse in Cloud Cavitating Flow Around a Slender Projectile

2015 ◽  
Author(s):  
Yiwei Wang ◽  
Chenguang Huang ◽  
Xiaocui Wu
Keyword(s):  
Phase Change ◽  
Numerical Simulations ◽  
Scaling Law ◽  
Cavitating Flow ◽  
Cavitation Model ◽  
Bubble Cluster ◽  
Collapse Pressure ◽  
Variation Range ◽  
Main Factors ◽  
Similarity Law

The scaling law of bubble cluster collapse in cloud cavitating flow around a slender projectile is investigated in the present paper. The influence of compressibility is mainly discussed. Firstly the governing parameters are obtained by dimensional analysis, and the numerical method is established in order to verify the similarity law and obtain the influence of parameters based on a mixture approach with Singhal cavitation model. Moreover, the similarity law is validated by numerical simulations. Two main factors of compressibility of mixture fluid, including compressibility of non-condensable gas and phase change, are studied, respectively. Results indicated that the phase change has little influence on both flowing and collapse pressure. In the condition that the variation range of the mixture compressibility is small, the compressibility of non-condensable gas has notable impact the local collapse pressure peaks, however the macroscopic flow pattern does not change.

scholarly journals Application of an electronegative gas as a third component of the working gas in the Geiger-Mueller counter

2018 ◽  
Vol 33 (3) ◽  
pp. 268-274 ◽  
Author(s):  
Luka Perazic ◽  
Cedomir Belic ◽  
Dalibor Arbutina
Keyword(s):  
Dead Time ◽  
Gas Mixtures ◽  
Operating Point ◽  
Gas Mixture ◽  
Electric Discharges ◽  
Tube Model ◽  
The Third ◽  
Similarity Law ◽  
Font Color

In this paper, the application of three-component gas mixtures as a working gas in Geiger-Mueller tubes was considered. In addition to the noble and quenching gas, an electronegative gas is used, at the same time, as the third component of gas mixture. This paper is mostly experimental. The experiments are carried out on the enlarged Geiger-Mueller counter tube model. By applying the similarity law for electric discharges in gases on the model and commercial Geiger-Mueller counting tubes, the model was verified. The obtained results showed that a small percentage of SF6 gas, in the working gas, stabilize operating point of Geiger-Mueller counter tubes and reduce dead time. <br><br><font color="red"><b> This article has been corrected. Link to the correction <u><a href="http://dx.doi.org/10.2298/NTRP1804417E">10.2298/NTRP1804417E</a><u></b></font>

A 3D QSAR approach to the search for geometrical similarity in a series of nonpeptide angiotensin II receptor antagonists

1994 ◽  
Vol 8 (2) ◽  
pp. 211-220 ◽  
Author(s):  
Laura Belvisi ◽  
Gianpaolo Bravi ◽  
Carlo Scolastico ◽  
Anna Vulpetti ◽  
Aldo Salimbeni ◽  
...  
Keyword(s):  
Angiotensin Ii ◽  
3D Qsar ◽  
Angiotensin Ii Receptor ◽  
Angiotensin Ii Receptor Antagonists ◽  
Receptor Antagonists ◽  
Geometrical Similarity
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