scholarly journals Experimental observation of the relationship between the pressure drop and flow rate of radial flow through porous media.

2016 ◽  
Author(s):  
Matthew Okruch
Keyword(s):  
Porous Media ◽  
Pressure Drop ◽  
Experimental Observation ◽  
Flow Rate ◽  
Radial Flow ◽  
Flow Through Porous Media ◽  
Flow Through ◽  
The Relationship

Oscillatory forcing of flow through porous media. Part 2. Unsteady flow

2002 ◽  
Vol 465 ◽  
pp. 237-260 ◽  
Author(s):  
D. R. GRAHAM ◽  
J. J. L. HIGDON
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Pressure Gradient ◽  
Flow Rate ◽  
Flow Through Porous Media ◽  
Mean Flow ◽  
Two Fluids ◽  
Mean Pressure ◽  
Flow Through ◽  
The Mean

Numerical computations are employed to study the phenomenon of oscillatory forcing of flow through porous media. The Galerkin finite element method is used to solve the time-dependent Navier–Stokes equations to determine the unsteady velocity field and the mean flow rate subject to the combined action of a mean pressure gradient and an oscillatory body force. With strong forcing in the form of sinusoidal oscillations, the mean flow rate may be reduced to 40% of its unforced steady-state value. The effectiveness of the oscillatory forcing is a strong function of the dimensionless forcing level, which is inversely proportional to the square of the fluid viscosity. For a porous medium occupied by two fluids with disparate viscosities, oscillatory forcing may be used to reduce the flow rate of the less viscous fluid, with negligible effect on the more viscous fluid. The temporal waveform of the oscillatory forcing function has a significant impact on the effectiveness of this technique. A spike/plateau waveform is found to be much more efficient than a simple sinusoidal profile. With strong forcing, the spike waveform can induce a mean axial flow in the absence of a mean pressure gradient. In the presence of a mean pressure gradient, the spike waveform may be employed to reverse the direction of flow and drive a fluid against the direction of the mean pressure gradient. Owing to the viscosity dependence of the dimensionless forcing level, this mechanism may be employed as an oscillatory filter to separate two fluids of different viscosities, driving them in opposite directions in the porous medium. Possible applications of these mechanisms in enhanced oil recovery processes are discussed.

Pressure drop and fractal non-Darcy coefficient model for fluid flow through porous media

2020 ◽  
Vol 184 ◽  
pp. 106579 ◽  
Author(s):  
Ting Huang ◽  
Pengbin Du ◽  
Xinkai Peng ◽  
Peng Wang ◽  
Gaofeng Zou
Keyword(s):  
Porous Media ◽  
Fluid Flow ◽  
Pressure Drop ◽  
Flow Through Porous Media ◽  
Flow Through

Investigation of Pressure Drop for Fluid Flow Through Porous Media: Application to a Pebble-Bed Reactor

2010 ◽  
Author(s):  
Xiaoyu Cai ◽  
Guanghui Su ◽  
Suizheng Qiu ◽  
Wenxi Tian
Keyword(s):  
Porous Media ◽  
Pressure Drop ◽  
Flow Characteristics ◽  
Internal Heat ◽  
Internal Heat Source ◽  
Flow Through Porous Media ◽  
Pebble Bed ◽  
Two Phase ◽  
Pebble Bed Reactor ◽  
Flow Through

The present studied Pebble-Bed Reactor is a light-water cooled reactor that consists of millions of Micro-Fuel Elements, and the TRISO-coated fuel particles (MFE) fill the fuel assembly disorderly and form a porous media with internal heat source. Papers on porous media continue to be published at the rate of about 150 per year and the domain of application is wide spread, ranging from chemical particle beds, mass separator units, debris beds, soil investigations, heat pipes and fluidized beds etc. In this paper, investigation is performed on the press drop under conditions of both single-phase and two-phase flow through porous media. Large number of relations are studied and the relational expressions, which generalize the available data of experiments, are suggested for pressure drop calculation in a pebble bed of spheres at random distribution. Finally, the relational expressions are applied to analyze the flow characteristics of the Pebble-Bed Reactor, such as the influence of pressure on two phase friction factor in the core etc.

Detachment phenomena in low Reynolds number flows through sinusoidally constricted tubes

1999 ◽  
Vol 387 ◽  
pp. 129-150 ◽  
Author(s):  
G. LENEWEIT ◽  
D. AUERBACH
Keyword(s):  
Pressure Drop ◽  
Inertial Range ◽  
Flow Through Porous Media ◽  
Dynamic Changes ◽  
Drop Velocity ◽  
Low Reynolds Number Flows ◽  
Velocity Relationship ◽  
Flow Through ◽  
The Relationship ◽  
Reynolds Number Flows

We examine the nature of detachment experimentally and numerically in steady axisymmetric flows through sinusoidally constricted tubes with Re varying from 10−4 to 102. Various regions can be distinguished, including flow detachment at the lowest Re used. Further, the transition in the pressure drop from a linear Poiseuille-like behaviour to a nonlinear pressure-drop–velocity relationship is not generally related to the appearance of detachment regions but rather to their form and to the nature of their growth. For the geometries considered here, the relationship between the start of nonlinearity in the pressure drop and incipient detachment depends on whether detachment is symmetric (detachment point at the bottom of a trough): for flow geometries with symmetric incipient detachment kinematic changes occur at Re lower than or the same as that at which dynamic changes can be detected, whereas for those with asymmetric incipient detachment they occur at higher Re. We look at various possible criteria for determining the transition from the viscous to the inertial range. Finally, we discuss the effect of elongational terms in the energy dissipation on flow through periodically constricted tubes and compare this flow with flow through porous media.

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