3D flow of a generalized Oldroyd-B fluid induced by a constant pressure gradient between two side walls perpendicular to a plate

The velocity distribution for time-dependent laminar flow in curved channels is derived. The analysis applies to flows with pressure gradients which are arbitrary functions of time. Numerical results are obtained for developing flow due to a constant pressure gradient. Developing flow in a straight channel is also discussed and it is found that the curvature ratio has only a small effect on the time required to reach the fully developed state.

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Two-Dimensional Jet Mixing With a Pressure Gradient

Journal of Applied Mechanics ◽

10.1115/1.3423553 ◽

1975 ◽

Vol 42 (1) ◽

pp. 55-60 ◽

Cited By ~ 3

Author(s):

D. F. Brink ◽

W. L. Chow

Keyword(s):

Pressure Gradient ◽

Analytical Study ◽

Constant Pressure ◽

Temperature Profiles ◽

Two Dimensional ◽

Governing Equations ◽

Jet Mixing ◽

Laminar Mixing ◽

Parallel Streams ◽

Boundary Layer Problems

An analytical study of nonsimilar jet mixing is made for compressible, nonisoenergetic flows. The conservation equations are solved for each of the streams above and below the dividing streamline by using Meksyn’s asymptotic method of integration for solving boundary-layer problems. The problem of laminar mixing between two parallel streams is investigated for the case of a constant pressure gradient. It is found that the velocity and temperature profiles from the exact solution to the nonsimilar governing equations can be well approximated by the locally similar solution.

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Study on Relation between Hydrodynamic Feature Size of HPAM and Pore Size of Reservoir Rock in Daqing Oilfield

Advances in Materials Science and Engineering ◽

10.1155/2015/139284 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6

Author(s):

Qing Fang ◽

Jinfeng Chen ◽

Chunnan Lu ◽

Dandan Yin ◽

Yiqiang Li

Keyword(s):

Pressure Gradient ◽

Polymer Solutions ◽

Constant Pressure ◽

Critical Concentration ◽

Polymer System ◽

Reservoir Rock ◽

Feature Size ◽

Gradient Distribution ◽

Injection Parameters ◽

Hydrodynamic Feature

The flow mechanism of the injected fluid was studied by the constant pressure core displacement experiments in the paper. It is assumed under condition of the constant pressure gradient in deep formation based on the characteristic of pressure gradient distribution between the injection and production wells and the mobility of different polymer systems in deep reservoir. Moreover, the flow rate of steady stream was quantitatively analyzed and the critical flow pressure gradient of different injection parameters polymer solutions in different permeability cores was measured. The result showed that polymer hydrodynamic feature size increases with the increasing molecular weight. If the concentration of polymer solutions overlaps beyond critical concentration, then molecular chains entanglement will be occur and cause the augment of its hydrodynamic feature size. The polymer hydrodynamic feature size decreased as the salinity of the dilution water increased. When the median radius of the core pore and throat was 5–10 times of the polymer system hydrodynamic feature size, the polymer solution had a better compatibility with the microscopic pore structure of the reservoir. The estimation of polymer solutions mobility in the porous media can be used to guide the polymer displacement plan and select the optimum injection parameters.

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Full-size mathematical model of the fuel metering unit

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2011.1.024 ◽

2011 ◽

Vol 8 (1) ◽

pp. 249-256

Author(s):

E.Sh. Nasibullaeva ◽

E.V. Denisova ◽

I.Sh. Nasibullayev

Keyword(s):

Mathematical Model ◽

Differential Equations ◽

Pressure Gradient ◽

Ordinary Differential Equations ◽

Constant Pressure ◽

Initial Conditions ◽

Control Valve ◽

Nonlinear Mathematical Model ◽

Full Size

The paper presents a nonlinear mathematical model for the operation of the fuel metering unit, which takes into account the operation of the control valve, which includes two pistons and three fuel circuits. A technique for determining the initial conditions for a system of ordinary differential equations describing the movements of a servo piston, a piston of a constant pressure gradient valve and a piston of a control valve is proposed.

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An experimental investigation of the planar turbulent wake in constant pressure gradient

Physics of Fluids ◽

10.1063/1.1490349 ◽

2002 ◽

Vol 14 (8) ◽

pp. 2817-2838 ◽

Cited By ~ 24

Author(s):

Xiaofeng Liu ◽

Flint O. Thomas ◽

Robert C. Nelson

Keyword(s):

Experimental Investigation ◽

Pressure Gradient ◽

Constant Pressure ◽

Turbulent Wake

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Effect of the Water Injection Pressure on the Permeability of Coal Body

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.734-737.551 ◽

2013 ◽

Vol 734-737 ◽

pp. 551-555

Author(s):

Hai Feng Ma ◽

Chuan Ming Li ◽

Jia Zhuo Li

Keyword(s):

Pressure Gradient ◽

Pressure Range ◽

Constant Pressure ◽

Water Pressure ◽

Water Injection ◽

Injection Pressure ◽

Measuring System ◽

Hole Wall ◽

Cubic Polynomial ◽

Distribution Water

The paper studied the change of permeability of three different coal seam samples at different injection pressure by using the MYS-I type permeability measuring system of coal and rock samples, according to the problem of the coal permeability highly affected during the seepage process, and also researched the water pressure distribution at the pressure of 4 MPa, 8MPa, and 12MPa based on COMSOL Multiphysics. The results show the permeability of coal samples gradually increases with injection pressure increasing and meets a cubic polynomial variation. The injection pressure range obeys a distribution, water pressure gradually decreases with increasing distance from the hole wall at the constant pressure, the flow velocity also reduces. The injection pressure gradient and the effective range gradually increases with injection pressure increasing, the pressure gradient gradually decreases with increasing distance from the hole wall, the maximum coverage radius of water injection pressure range is about 9.5m.

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