Unsteady slip flow in an electrically conducting two-phase fluid under transverse magnetic fields

1975 ◽  
Vol 28 (2) ◽  
pp. 349-362 ◽  
Author(s):  
L. Debnath ◽  
U. Basu
Keyword(s):  
Magnetic Fields ◽  
Slip Flow ◽  
Transverse Magnetic ◽  
Two Phase ◽  
Electrically Conducting ◽  
Phase Fluid

scholarly journals Hydromagnetic Rarefied Fluid Flow over a Wedge in the Presence of Surface Slip and Thermal Radiation

2017 ◽  
Vol 22 (4) ◽  
pp. 827-837 ◽  
Author(s):  
K. Das ◽  
R. P. Sharma ◽  
P.R. Duari
Keyword(s):  
Thermal Radiation ◽  
Slip Flow ◽  
Transverse Magnetic ◽  
Skin Friction Coefficient ◽  
Temperature Dependent ◽  
Electrically Conducting ◽  
Dimensionless Velocity ◽  
Runge Kutta Method ◽  
Reduced Equations ◽  
Fluid Properties

Abstract An analysis is presented to investigate the effects of thermal radiation on a convective slip flow of an electrically conducting slightly rarefied fluid, having temperature dependent fluid properties, over a wedge with a thermal jump at the surface of the boundary in the presence of a transverse magnetic field. The reduced equations are solved numerically using the finite difference code that implements the 3-stage Lobatto IIIa formula for the partitioned Runge-Kutta method. Numerical results for the dimensionless velocity and temperature as well as for the skin friction coefficient and the Nusselt number are presented through graphs and tables for pertinent parameters to show interesting aspects of the solution.

Expansion Waves in Two-Phase Pipelines

2006 ◽  
Author(s):  
Alessandro Terenzi
Keyword(s):  
Sound Velocity ◽  
Slip Flow ◽  
Expansion Wave ◽  
Two Phase ◽  
Expansion Waves ◽  
Internal Fluid ◽  
Pressurized Pipelines ◽  
The Impact ◽  
Phase Fluid ◽  
Wave Calculation

The analysis of the expansion wave propagation generated by full-bore ruptures of pressurized pipelines containing compressible fluids must be carried out during the assessment of the possible use of crack arrestors. If the internal fluid is two-phase, the sound velocity dependence from the local void fraction and flow regime has to be taken into account, by considering that it may be much lower than for single phase gases, thus promoting crack propagation. In this paper a model for the simulation of an expansion wave in a two-phase fluid pipeline is presented; this model includes several possible descriptions of the thermodynamics and flow regimes, ranging from the simpler homogeneous equilibrium approach to the non-equilibrium slip flow evaluation. The sound velocity trend inside a rarefaction wave can give rise to particular phenomena as curve inversions and jumps. The impact of different formulations on the expansion wave calculation is discussed, giving hints for the design of the pipelines under consideration.

Magnetohydrodynamic flows and turbulence: a report on the Second Bat-Sheva Seminar

1979 ◽  
Vol 91 (3) ◽  
pp. 563-580 ◽  
Author(s):  
H. Branover ◽  
J. C. R. Hunt ◽  
M. R. E. Proctor ◽  
E. S. Pierson
Keyword(s):  
Magnetic Fields ◽  
Turbulent Flows ◽  
Measurement Techniques ◽  
Transverse Magnetic ◽  
Longitudinal Diffusion ◽  
Two Phase ◽  
Magnetohydrodynamic Flows ◽  
Fluid Properties ◽  
High Reynolds ◽  
The University

This paper is a summary of the Second Bat-Sheva Seminar on magnetohydrodynamic (MHD) Flows and turbulence. It was held in the University of the Negev, Israel, on 28-31 March 1978, with 64 participants from 7 countries. Reviews and research papers were presented on the general theory of MHD, MHD duct flows (with emphasis on novel aspects such as non-uniform fields and fluid properties, bends, free-surface effects and longitudinal diffusion), two-phase flows (especially those likely to occur in a liquid-metal generator), turbulence and instabilities, and electrically driven flows (with new results presented for the theory of laminar and turbulent flows in induction furnaces, and for the theory of thermo-electrically driven flows in transverse magnetic fields). One day of the conference was devoted to turbulence, mainly without magnetic fields, with reviews and new results presented on the theory and measurements of coherent structures, intermittency at high Reynolds number, methods of calculating shear flows, and measurement techniques. The seminar was a strange mixture of people and topics, which produced some interesting papers and some useful discussion.

Expansion of a Very Low Quality Two-Phase Fluid Through a Convergent-Divergent Nozzle

1964 ◽  
Vol 86 (2) ◽  
pp. 247-254 ◽  
Author(s):  
E. S. Starkman ◽  
V. E. Schrock ◽  
K. F. Neusen ◽  
D. J. Maneely
Keyword(s):  
Experimental Data ◽  
Slip Flow ◽  
Design Criteria ◽  
Saturated Liquid ◽  
Two Phase ◽  
Flow Rates ◽  
Isentropic Expansion ◽  
Mass Flow Rates ◽  
Laval Nozzles ◽  
Phase Fluid

Flow in de Laval nozzles of high pressure, low-quality steam-water mixtures was investigated to determine the resulting mass flow rates and to acquire design criteria information. Qualities ranged from 0 to 20 percent and pressures up to 1000 psia. Comparisons of the experimental data to three simple models: (a) isentropic expansion; (b) frozen composition; and (c) slip flow, showed satisfactory correspondence at all conditions except for qualities very close to saturated liquid. Observation was made that a condition similar to shock resulted when the nozzles were overexpanded.

scholarly journals MHD Two-Fluid Flow and Heat Transfer between Two Inclined Parallel Plates in a Rotating System

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
P. Sri Ramachandra Murty ◽  
G. Balaji Prakash
Keyword(s):  
Perturbation Technique ◽  
Approximate Solutions ◽  
Transverse Magnetic ◽  
Parallel Plates ◽  
Regular Perturbation ◽  
Rotating System ◽  
Two Phase ◽  
Electrically Conducting ◽  
Electrical Conductivities ◽  
Primary Velocity

Two-phase magnetohydrodynamic convective flow of electrically conducting fluid through an inclined channel is studied under the action of a constant transverse magnetic field in a rotating system. The fluids in the two phases are steady, incompressible, laminar, immiscible, and electrically conducting, having different densities, viscosities, and thermal and electrical conductivities. The transport properties of both the fluids are assumed constant. The bounding infinite inclined parallel plates are maintained at different constant temperatures, making an angle ϕ with the horizontal. Approximate solutions for velocity and temperature distributions are obtained by using a straightforward regular perturbation technique. An in-depth study has been done on the effects of rotation parameter, Hartmann number, inclination angle, the ratio of electrical conductivities, and viscosities of two fluids on the flow. It is observed that the effect of increasing rotation is to decrease the primary velocity. Further it is noticed that as the rotation increases, the secondary velocity increases for smaller rotation, while for larger rotation it decreases. It is also found that the temperature distribution decreases as the rotation increases.

Radio Measurements of Coronal Magnetic Fields

1994 ◽  
Vol 144 ◽  
pp. 21-28 ◽  
Author(s):  
G. B. Gelfreikh
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Active Regions ◽  
High Sensitivity ◽  
Coronal Magnetic Field ◽  
Transverse Magnetic ◽  
Radio Sources ◽  
Radio Waves ◽  
Solar Active Regions

AbstractA review of methods of measuring magnetic fields in the solar corona using spectral-polarization observations at microwaves with high spatial resolution is presented. The methods are based on the theory of thermal bremsstrahlung, thermal cyclotron emission, propagation of radio waves in quasi-transverse magnetic field and Faraday rotation of the plane of polarization. The most explicit program of measurements of magnetic fields in the atmosphere of solar active regions has been carried out using radio observations performed on the large reflector radio telescope of the Russian Academy of Sciences — RATAN-600. This proved possible due to good wavelength coverage, multichannel spectrographs observations and high sensitivity to polarization of the instrument. Besides direct measurements of the strength of the magnetic fields in some cases the peculiar parameters of radio sources, such as very steep spectra and high brightness temperatures provide some information on a very complicated local structure of the coronal magnetic field. Of special interest are the results found from combined RATAN-600 and large antennas of aperture synthesis (VLA and WSRT), the latter giving more detailed information on twodimensional structure of radio sources. The bulk of the data obtained allows us to investigate themagnetospheresof the solar active regions as the space in the solar corona where the structures and physical processes are controlled both by the photospheric/underphotospheric currents and surrounding “quiet” corona.

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