Dynamic Reversibility in Fluid Flows

1967 ◽  
Vol 89 (1) ◽  
pp. 237-238 ◽  
Author(s):  
Kirit Yajnik
Keyword(s):  
Velocity Field ◽  
Newtonian Fluid ◽  
Fluid Flows ◽  
The Other ◽  
Two Dimensional ◽  
Reversed Flow ◽  
Unidirectional Flow ◽  
Flow Through ◽  
Simple Character ◽  
Dynamic Reversibility

This note points out the relatively simple character of dynamically reversible flows. A flow is said to be dynamically reversible if the reversed flow is possible under the action of suitable forces. The velocity field in the case of such flows of a Newtonian fluid subjected to conservative body forces can be decomposed into two parts, one satisfying Laplace’s equation and the other, the conduction equation. An integral similar to Bernoulli’s integral can also be found. In addition, the vorticity in two-dimensional flows is constant along a streamline. The property of dynamic reversibility is enjoyed by many flows such as irrotational flows, unidirectional flow through pipes, and two-dimensional axisymmetric vortexes.

scholarly journals Modeling and Simulation of Newtonian Fluid Flow through Two-Dimensional Backward-Facing Step Channel with Finite Element�s Technique

2019 ◽  
Vol 12 (32) ◽  
pp. 1-6
Author(s):  
Abid Ali Memon ◽  
Hisam-uddin Shaikh ◽  
Baqir Ali Shah ◽  
Muhammad Afzal Soomro ◽  
Abdul Ghafoor Shaikh ◽  
...  
Keyword(s):  
Finite Element ◽  
Fluid Flow ◽  
Modeling And Simulation ◽  
Newtonian Fluid ◽  
Two Dimensional ◽  
Backward Facing Step ◽  
Flow Through

Laminar Wall Jet of a Non-Newtonian Fluid Over a Curved Surface

1984 ◽  
Vol 51 (2) ◽  
pp. 440-443 ◽  
Author(s):  
Rama Subba Reddy Gorla
Keyword(s):  
Friction Coefficient ◽  
Velocity Field ◽  
Newtonian Fluid ◽  
Similarity Solution ◽  
Skin Friction Coefficient ◽  
Curved Surface ◽  
Wall Jet ◽  
Two Dimensional ◽  
Special Shape ◽  
Curvature Parameter

An analysis is presented for the flow of a laminar, two-dimensional, incompressible, non-Newtonian fluid jet flowing over a curved surface. A unique similarity solution is obtained for both concave and convex surfaces. The similarity solution requires a special shape of the curved surface which is also determined. Numerical results are presented for the details of the velocity field and skin friction coefficient as a function of the curvature parameter.

Steady flow through non-uniform gauzes of arbitrary shape

1959 ◽  
Vol 5 (3) ◽  
pp. 355-368 ◽  
Author(s):  
J.W Elder
Keyword(s):  
Arbitrary Shape ◽  
Axisymmetric Flow ◽  
Circular Cone ◽  
The Other ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Uniform Shear ◽  
Two Dimensional Flow ◽  
Diverging Channel ◽  
Flow Through

The steady, two-dimensional flow through an arbitrarily-shaped gauze, of non-uniform properties, placed in a parallel channel is considered for the case in which viscosity can be ignored except in the immediate vicinity of the gauze. The equations are linearized by requiring departures from uniformity both in the flow and in the gauze parameters to be small. Knowledge of any three of the upstream profile, the downstream profile, the shape of the gauze and the gauze parameters, allows the other to be calculated from a linear relation between these four quantities. Particular solutions are given for the production of a uniform shear and the flow through linear and parabolic gauzes. The validity of the solution is verified by experiment. It is shown that the method can also be applied to two-dimensional flow in a diverging channel, axisymmetric flow in a circular pipe and in a circular cone and to flow through multiple gauzes.

Natural Convection of Air through an Asymmetrically Heated Vertical Channel with a Baffle

2016 ◽  
Vol 846 ◽  
pp. 7-11
Author(s):  
Cheng Wang Lei ◽  
Tuo Tian Wang
Keyword(s):  
Natural Convection ◽  
Reverse Flow ◽  
Air Flow ◽  
Vertical Channel ◽  
The Other ◽  
Heated Wall ◽  
Two Dimensional ◽  
Flow Through ◽  
Vertical Ventilation ◽  
Ventilation Performance

The buoyancy-induced air flow through a two-dimensional vertical ventilation channel is calculated. One of the channel walls is heated uniformly, and the other wall is adiabatic. A thin baffle is placed on the heated wall to manipulate the air flow through the channel. Numerical results are obtained for baffles of different lengths and placed at various heights along the heated wall. It is found that the baffle is effective in weakening a reverse flow at the exit of the channel, and significant enhancement of ventilation performance may be achieved with the presence of the baffle.

scholarly journals Heat Transfer Analysis on the Hiemenz Flow of a Non-Newtonian Fluid: A Homotopy Method Solution

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Yasir Khan ◽  
Zdeněk Šmarda
Keyword(s):  
Heat Transfer ◽  
Linear Operator ◽  
Stagnation Point ◽  
Newtonian Fluid ◽  
Fluid Flows ◽  
Heat Transfer Analysis ◽  
Shrinking Sheet ◽  
Nonlinear Ordinary Differential Equations ◽  
Two Dimensional ◽  
Homotopy Perturbation

The mathematical model for the incompressible two-dimensional/axisymmetric non-Newtonian fluid flows and heat transfer analysis in the region of stagnation point over a stretching/shrinking sheet and axisymmetric shrinking sheet is presented. The governing equations are transformed into dimensionless nonlinear ordinary differential equations by similarity transformation. Analytical technique, namely, the homotopy perturbation method (HPM) with general form of linear operator is used to solve dimensionless nonlinear ordinary differential equations. The series solution is obtained without using the diagonal Padé approximants to handle the boundary condition at infinity which can be considered as a clear advantage of homotopy perturbation technique over the decomposition method. The effects of the pertinent parameters on the velocity and temperature field are discussed through graphs. To the best of authors’ knowledge, HPM solution with general form of linear operator for two-dimensional/axisymmetric non-Newtonian fluid flows and heat transfer analysis in the region of stagnation point is presented for the first time in the literature.

scholarly journals The design of repeating patterns

1922 ◽  
Vol 101 (708) ◽  
pp. 81-94 ◽  
Keyword(s):  
Fixed Point ◽  
Two Dimensions ◽  
The Other ◽  
Point Symmetry ◽  
Two Dimensional ◽  
Equal Distance ◽  
Simple Character ◽  
Repeating Patterns

2. The geometry which is involved is of a novel but simple character. It is entirely two-dimensional so long as patterns in two dimensions are in view. Two figures are looked upon as identical only when they can be made to coincide by movements in the plane. If two figures be such that one is the image of the other, but not identical with it, and one be denoted by a , the other is conveniently denoted by l a , and, when necessary, the position of the line which determines the position of the image will be stated. If a point α. be joined to a fixed point O in the plane and the line αO be produced an equal distance to α'; α, α' are the point images of one another (or are in point symmetry) with respect to the point O.

Three-Dimensional Reconstruction of Two Forms of the Chaperonin GRO EL

1990 ◽  
Vol 48 (1) ◽  
pp. 258-259
Author(s):  
J.L. Carrascosa ◽  
G. Abella ◽  
S. Marco ◽  
M. Muyal ◽  
J.M. Carazo
Keyword(s):  
Three Dimensional ◽  
The Other ◽  
Two Dimensional ◽  
Series Method ◽  
Three Dimensional Reconstruction ◽  
Structural Components ◽  
E Coli ◽  
Dimensional Reconstruction ◽  
Morphogenetic Factors ◽  
Tilt Series

Chaperonins are a class of proteins characterized by their role as morphogenetic factors. They trantsiently interact with the structural components of certain biological aggregates (viruses, enzymes etc), promoting their correct folding, assembly and, eventually transport. The groEL factor from E. coli is a conspicuous member of the chaperonins, as it promotes the assembly and morphogenesis of bacterial oligomers and/viral structures.We have studied groEL-like factors from two different bacteria:E. coli and B.subtilis. These factors share common morphological features , showing two different views: one is 6-fold, while the other shows 7 morphological units. There is also a correlation between the presence of a dominant 6-fold view and the fact of both bacteria been grown at low temperature (32°C), while the 7-fold is the main view at higher temperatures (42°C). As the two-dimensional projections of groEL were difficult to interprete, we studied their three-dimensional reconstruction by the random conical tilt series method from negatively stained particles.

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