Amplification and attenuation of waves of finite duration by means of a bubble zone in the one-dimensional approximation

2012 ◽  
Vol 9 (2) ◽  
pp. 33-37
Author(s):  
M.N. Galimzyanov
Keyword(s):  
Solid Wall ◽  
Nonlinear Effects ◽  
Uneven Distribution ◽  
Pressure Waves ◽  
One Dimensional ◽  
Finite Duration ◽  
Dimensional Approximation ◽  
The One ◽  
Bubble Zone ◽  
As Effects

Some peculiarities of the dynamics of pressure waves in a fluid containing bubble zone of finite dimensions in the one-dimensional approximation are studied. The problem is considered taking into account nonlinear effects. The results of the action of wave pulses on a bubble area with an uneven distribution of bubbles are presented, as well as effects on a solid wall covered with a bubble area.

A Stefan problem in a Bridgman crystal grower

1995 ◽  
Vol 6 (3) ◽  
pp. 191-199
Author(s):  
P. den Decker ◽  
R. van der Hout ◽  
C. J. Van Duijn ◽  
L. A. Peletier
Keyword(s):  
Critical Speed ◽  
Internal Heat ◽  
Mushy Region ◽  
Dimensional Model ◽  
Real Situation ◽  
One Dimensional ◽  
Dimensional Approximation ◽  
The One ◽  
Strong Curvature ◽  
Bridgman Crystal Grower

We discuss a one-dimensional model for a Bridgman crystal grower, where the removal of heat is described by an internal heat sink. A consequence is the apparent existence of mushy regions for relatively large velocities of the cooling machine; these mushy regions are an artefact of the one-dimensional approximation. We show that for some types of cooling profiles there exists a critical speed for the existence of mushy regions, whereas for different cooling profiles no such critical speed exists. The presence of a mushy region may indicate a strong curvature of the liquid/solid interface in the real situation.

Kinetic calculation of a turbulent flame in the one-dimensional approximation

1980 ◽  
Vol 16 (4) ◽  
pp. 365-369
Author(s):  
V. Ya. Basevich ◽  
V. P. Volodin ◽  
S. M. Kogarko ◽  
N. I. Peregudov
Keyword(s):  
Turbulent Flame ◽  
Kinetic Calculation ◽  
One Dimensional ◽  
Dimensional Approximation ◽  
The One

The one-Dimensional Unsteady Flow Prediction Method for Pressure Waves in High-Speed Subway and its Applications

2011 ◽  
Vol 94-96 ◽  
pp. 1967-1970
Author(s):  
Chao Hui Zhou ◽  
Yuan Gui Mei
Keyword(s):  
Unsteady Flow ◽  
High Speed ◽  
Prediction Method ◽  
Pressure Waves ◽  
Subway Tunnel ◽  
One Dimensional ◽  
Flow Prediction ◽  
Cross Section Area ◽  
Section Area ◽  
The One

With the speed-up of subway, the discomfort problem of passengers caused by pressure waves becomes more and more serious. The prediction method of the pressure waves based on the one-dimensional unsteady compressible non-homentropic flow model and the method of characteristics is introduced, and the program is developed which can be used to calculate the pressure waves not only produced by single train passing through subway tunnel with airshafts, but also produced when the train starts or stops. On this base, the influence of the train speed and the cross-section area of airshafts to the comfort of passengers in the subway is researched. All these work provides the foundation for the development of the one-dimensional unsteady flow prediction method for pressure waves produced by the train passing through subway tunnel.

Thermochemical Response of Honeycomb Sandwich Panels

1983 ◽  
Vol 1 (5) ◽  
pp. 379-395
Author(s):  
Kumar Ramohalli
Keyword(s):  
Thermal Conductivity ◽  
Analytical Solution ◽  
Thermal Conductivity Coefficient ◽  
Sandwich Panels ◽  
One Dimensional ◽  
Dimensional Approximation ◽  
Honeycomb Sandwich ◽  
The One

A simple study aimed at predicting the Thermochemical Response of honey comb sandwich panels is presented. The overall thermal conductivity coefficient for the panel is obtained through a consideration of the convective gas move ment within the cell spaces. The earlier correlations of Catton and Edwards are used. The analytical solution for the one-dimensional approximation is quoted from an earlier study.

Pressure waves in a liquid containing bubble zone of finite dimensions

2003 ◽  
Vol 3 ◽  
pp. 117-127
Author(s):  
M.N. Galimzyanov ◽  
V.Sh. Shagapov
Keyword(s):  
Numerical Experiments ◽  
Solid Wall ◽  
Pressure Waves ◽  
Two Dimensional ◽  
Bubble Zone

Some features of the dynamics of nonlinear two-dimensional pressure waves in a liquid containing bubble zone of finite dimensions and various shapes are studied. The results of numerical experiments on the action of wave pulses on a solid wall are presented, in the cases of the absence and presence of a bubble zone on the surface under consideration. Based on the results obtained, a number of dependences of the dynamics of two-dimensional disturbances on the parameters of the signal and the medium are revealed.

The one-dimensional approximation for infiltration in heterogeneous soils

1991 ◽  
Vol 27 (6) ◽  
pp. 1019-1027 ◽  
Author(s):  
Angelos L. Protopapas ◽  
Rafael L. Bras
Keyword(s):  
One Dimensional ◽  
Heterogeneous Soils ◽  
Dimensional Approximation ◽  
The One
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