Oblique weir equation using incomplete self-similarity

2006 ◽  
Vol 33 (10) ◽  
pp. 1241-1250 ◽  
Author(s):  
S M Borghei ◽  
A R Kabiri-Samani ◽  
N Nekoee
Keyword(s):  
Experimental Data ◽  
Data Analysis ◽  
Theoretical Analysis ◽  
Computer Program ◽  
Key Words ◽  
Dimensional Analysis ◽  
Flow Characteristics ◽  
Experimental Results ◽  
Trial And Error ◽  
Self Similarity

Incomplete self-similarity (ISS) concept is employed to develop the equations from existing experimental results of flow over an oblique rectangular sharp-crested weir for both free and submerged flow. The stage-discharge relationship is obtained by theoretical analysis, based on the application of the dimensional analysis and the ISS theory. For analysis, the relations were found by trial and error procedure using the SPSS mathematical computer program that estimates the relation among multi-variable functions. Thus, equations to estimate the flow characteristics for both free and submerged flow are proposed. The results show a better compatibility with the experimental data than the previous equations given by the main author. Hence, the capabilities of ISS method for similar analysis and the powerful program of SPSS for multi-variable data analysis is shown. Finally, design guides together with examples are presented to show the simple use of the graphs obtained . Key words: dimensional analysis, incomplete self-similarity (ISS), oblique weir, experimental data.

Design Comments and Experimental Results for Cavitation-Resistant Inducers up to 40,000 Suction Specific Speed

1964 ◽  
Vol 86 (2) ◽  
pp. 176-180
Author(s):  
M. K. Wright
Keyword(s):  
Experimental Data ◽  
Rocket Engine ◽  
Geometric Design ◽  
Experimental Results ◽  
Cavitation Resistance ◽  
Trial And Error ◽  
Error Type ◽  
General Correlation ◽  
Design Considerations ◽  
Specific Speed

General geometric design considerations for cavitation resistant inducers are discussed, particularly those related to the “trial and error” type not covered by the textbook approach. A general correlation of four dimensionless cavitation parameters is developed. Experimental data for typical rocket engine pumps are given where suction specific speed values up to 40,000 are obtained. Finally, several schemes are given for augmenting the cavitation resistance.

Analysis and Experimental Verification on Bias Drift of Silicon Microgyroscope

2014 ◽  
Vol 670-671 ◽  
pp. 1305-1309
Author(s):  
Wei Feng Tang ◽  
An Ping Qiu ◽  
Guo Ming Xia ◽  
Yan Su
Keyword(s):  
Experimental Data ◽  
Theoretical Analysis ◽  
Relative Error ◽  
Experimental Verification ◽  
Output Voltage ◽  
Structure Design ◽  
Experimental Results ◽  
Theoretical Formula ◽  
Bias Drift ◽  
Experimental Bias

There is a bias drift of silicon microgyroscope when power on which limits its application in higher precision field. This paper analyzes and validates the main cause of bias drift, combined with theoretical analysis of demodulation and experimental results, which has a great significance for improving the performance of silicon microgyroscope. First of all, operating principle of silicon microgyroscope is introduced and theoretical analysis on bias drift is made on the basis of DC output voltage of microgyroscope. Secondly, demodulated signals’ amplitude and phase are analyzed in Matlab with the experimental data. By contrasting theoretical and experimental bias drift, the accuracy of theoretical formula is verified. It turns out that, the relative error of bias drift from 2-hours value to stable value is 5.5%, it’s 6.6% for 1-hour value to stable value and for beginning it’s just 1.7%. Experimental results agrees well with the theoretical analysis, which verifies that the main cause of bias drift of silicon microgyroscope is the phase difference between Vds and Vsense. This conclusion can provide some guidance for structure design optimization and circuits improving.

Experiments on granular flows to predict avalanche runup

1995 ◽  
Vol 32 (2) ◽  
pp. 285-295 ◽  
Author(s):  
T. Chu ◽  
G. Hill ◽  
D.M. McClung ◽  
R. Ngun ◽  
R. Sherkat
Keyword(s):  
Experimental Data ◽  
Key Words ◽  
Traditional Method ◽  
Granular Flows ◽  
Leading Edge ◽  
Experimental Results ◽  
Centre Of Mass ◽  
One Dimensional ◽  
Run Up ◽  
Runup Height

Design of deflectors or barriers to slow or stop snow avalanche debris in the runout zone requires estimates of runup height. In this paper, experimental data on runup of dense, dry granular flows in a flume are presented. The data are then compared with two one-dimensional theoretical equations for runup estimation: (1) a formulation based on following the leading edge of the flow up the barrier and (2) the traditional method adapted from equations presented by A. Voellmy for describing the centre of mass of the avalanche. The results show that the leading-edge model more closely matches the experimental results and, in field applications, the leading-edge model is expected to provide higher and, therefore, more conservative runup estimates. Key words : avalanche run-up, granular flows, avalanche defences, runout zone.

The Fluid Dynamics of Safety Valve Vent Stacks

1985 ◽  
Vol 107 (3) ◽  
pp. 397-401
Author(s):  
M. Samimy ◽  
A. L. Addy
Keyword(s):  
Fluid Dynamics ◽  
Theoretical Analysis ◽  
Computer Program ◽  
Flow Model ◽  
Safety Valve ◽  
Flow Theory ◽  
Base Flow ◽  
Experimental Results ◽  
Flow Through

The flow through a safety valve vent stack system has been modeled and analyzed theoretically and experimentally. The theoretical analysis is based on the well known Chapman-Korst base flow theory. The base flow model is augmented with an empirically determined recompression factor to improve agreement between the theoretical analysis and experimental results. A computer program has been developed to solve the equations and provide necessary information to designers.

scholarly journals Thermal conductivity difference between nanofluids and micro-fluids: Experimental data and theoretical analysis using mass difference scattering

2019 ◽  
Vol 23 (6 Part B) ◽  
pp. 3797-3807
Author(s):  
Fabrizio Iacobazzi ◽  
Gianpiero Colangelo ◽  
Marco Milanese ◽  
Risi de
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Theoretical Analysis ◽  
Metal Oxides ◽  
Mass Difference ◽  
Deionized Water ◽  
Experimental Results ◽  
Experimental Campaign ◽  
Nanometric Particles ◽  
Phonon Theory

In this work, an experimental campaign on different nanofluids and micro-fluids, obtained by the dispersion of three different metal oxides (CuO, ZnO, and TiO2) with diathermic oil or deionized water has been carried out, in order to extend phonon theory to liquids, as already done in a previous work on Al2O3. Thermal conductivity of stable samples was evaluated by time. The experimental results on thermal conductivity of stable micrometric and nanometric particles suspensions in oil and water showed a further proof of mass difference scattering phenomenon.

Microdiffraction Patterns of Small Metallic Particles II; Theoretical Analysis

1982 ◽  
Vol 40 ◽  
pp. 668-669
Author(s):  
A. Gómez ◽  
P. Schabes-Retchkiman ◽  
M. José-Yacamán ◽  
T. Ocaña
Keyword(s):  
Experimental Data ◽  
Electron Diffraction ◽  
Theoretical Analysis ◽  
Size Range ◽  
Dynamical Theory ◽  
Metallic Particles ◽  
Splitting Effect

The splitting effect that is observed in microdiffraction pat-terns of small metallic particles in the size range 50-500 Å can be understood using the dynamical theory of electron diffraction for the case of a crystal containing a finite wedge. For the experimental data we refer to part I of this work in these proceedings.

scholarly journals Revisiting the Analysis of the Isochronous Mass Measurements of Uranium Fission Fragments at the ESR

2020 ◽  
Vol 227 ◽  
pp. 02012
Author(s):  
R. S. Sidhu ◽  
R. J. Chen ◽  
Yu. A Litvinov ◽  
Y. H. Zhang ◽  
Keyword(s):  
Experimental Data ◽  
Data Analysis ◽  
State Of The Art ◽  
Fission Products ◽  
Mass Measurements ◽  
Fission Fragments ◽  
Uranium Fission

The re-analysis of experimental data on mass measurements of ura- nium fission products obtained at the ESR in 2002 is discussed. State-of-the-art data analysis procedures developed for such measurements are employed.

PHOTOINDUCED NONLINEAR OCTUPOLAR POLARIZATION: TRANSIENT AND PERMANENT REGIMES

1996 ◽  
Vol 05 (04) ◽  
pp. 653-670 ◽  
Author(s):  
CÉLINE FIORINI ◽  
JEAN-MICHEL NUNZI ◽  
FABRICE CHARRA ◽  
IFOR D.W. SAMUEL ◽  
JOSEPH ZYSS
Keyword(s):  
Theoretical Analysis ◽  
Second Harmonic ◽  
Experimental Results ◽  
Polar Field ◽  
Rotational Spectrum ◽  
Dual Frequency ◽  
One Dimensional ◽  
Ethyl Violet ◽  
Disperse Red 1 ◽  
Good Agreement

An original poling method using purely optical means and based on a dual-frequency interference process is presented. We show that the coherent superposition of two beams at fundamental and second-harmonic frequencies results in a polar field with an irreducible rotational spectrum containing both a vector and an octupolar component. This enables the method to be applied even to molecules without a permanent dipole such as octupolar molecules. After a theoretical analysis of the process, we describe different experiments aiming at light-induced noncentrosymmetry performed respectively on one-dimensional Disperse Red 1 and octupolar Ethyl Violet molecules. Macroscopic octupolar patterning of the induced order is demonstrated in both transient and permanent regimes. Experimental results show good agreement with theory.

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