Signal Analysis and Characterization of Natural Circulation Two-Phase Flows in the Time, Amplitude and Frequency Domains

2008 ◽  
Author(s):  
J Aparna ◽  
B.S.V.G Sharma
Keyword(s):  
Signal Analysis ◽  
Natural Circulation ◽  
Two Phase Flows ◽  
Two Phase ◽  
Frequency Domains

Characterization of two phase flows in chemical engineering reactors

2011 ◽  
Vol 22 (4) ◽  
pp. 265-271 ◽  
Author(s):  
S.L. Kiambi ◽  
H.K. Kiriamiti ◽  
A. Kumar
Keyword(s):  
Chemical Engineering ◽  
Two Phase Flows ◽  
Two Phase

Characterization of gas-liquid two phase flows using dielectric Sensors

2015 ◽  
Vol 45 ◽  
pp. 274-279 ◽  
Author(s):  
S. Arunkumar ◽  
J. Adhavan ◽  
M. Venkatesan ◽  
S.K. Das ◽  
A.R. Balakrishnan
Keyword(s):  
Two Phase Flows ◽  
Two Phase ◽  
Dielectric Sensors

scholarly journals Calculations of the pressure drop in the natural circulation boiler evaporator

2018 ◽  
Vol 240 ◽  
pp. 05009 ◽  
Author(s):  
Slawomir Grądziel ◽  
Karol Majewski
Keyword(s):  
Pressure Drop ◽  
Power Plants ◽  
Graphical Method ◽  
Natural Circulation ◽  
Homogeneous Model ◽  
Phase Slip ◽  
Two Phase Flows ◽  
Two Phase ◽  
Pressure Losses

The paper presents different models used to determine pressure losses in two-phase flows: the homogeneous model, the Lockhart-Martinelli, the Friedel and the Chisholm phase-slip models and the Martinelli-Nelson graphical method. The pressure losses are calculated for the evaporator of an OP-210 boiler with the output of 210×103 kg/h operating in one of the Polish power plants. The results obtained by means of the presented models are compared to each other.

A positivity-preserving central-upwind scheme for isentropic two-phase flows through deviated pipes

2019 ◽  
Vol 53 (5) ◽  
pp. 1433-1457
Author(s):  
Gerardo Hernandez-Duenas ◽  
Ulises Velasco-García ◽  
Jorge X. Velasco-Hernández
Keyword(s):  
Oil And Gas ◽  
Steady States ◽  
Upwind Scheme ◽  
Directional Drilling ◽  
Two Phase Flows ◽  
Two Phase ◽  
New Type ◽  
Particle Bed ◽  
System Of Balance Laws

Directional drilling in oil and gas extraction can encounter difficulties such as accumulation of solids in deviated pipes. Motivated by such phenomenon, we consider a model for isentropic two-phase flows through deviated pipes. The system of partial differential equations is aimed at simulating the dynamics between a particle bed and a gas phase. The pipe can be either horizontal or vertically deviated where the effects of gravity are incorporated. Furthermore, the acceleration or deceleration due to friction between phases is investigated and spectral properties of the hyperbolic system of balance laws are described. The existence and characterization of steady states under appropriate conditions is analyzed. A new type of steady states arises when a balance between gas and solid phases results in a non-uniform solid particle bed and vanishing solid velocity. This state corresponds to an accumulation of sedimented solids. A central-upwind scheme that preserves the positivity of the gas and solid densities and volume fractions is presented. Including an application of the model to an analysis of accumulation of solids, a variety of numerical tests is presented to show the merits of the scheme.

Hydrodynamic Characterization of Dispersed Two-Phase Flows by Laser Doppler Velocimeter

2000 ◽  
Vol 78 (6) ◽  
pp. 903-910 ◽  
Author(s):  
N.S. Deshpande ◽  
CH.V. Prasad ◽  
A.A. Kulkarni ◽  
J.B. Joshi
Keyword(s):  
Laser Doppler ◽  
Laser Doppler Velocimeter ◽  
Two Phase Flows ◽  
Two Phase

scholarly journals Characterization of two-phase flows using fractal analysis of local temperature fluctuations

1996 ◽  
Vol 22 (5) ◽  
pp. 953-968 ◽  
Author(s):  
R. Kozma ◽  
H. Kok ◽  
M. Sakuma ◽  
D.D. Djainal ◽  
M. Kitamura
Keyword(s):  
Fractal Analysis ◽  
Temperature Fluctuations ◽  
Local Temperature ◽  
Two Phase Flows ◽  
Two Phase
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