study of the flow resistance of composite porous structures

  • 102 Pages
  • 3.98 MB
  • English
[Distributed by] Institute of Paper Chemistry , Appleton, Wis
Fluid dynamics, Porosity, Permeab
Other titlesFlow resistance of composite porous structures
Statementby John F. Perry
ContributionsInstitute of Paper Chemistry (Appleton, Wis.)
The Physical Object
Paginationiii, 102 p. :
ID Numbers
Open LibraryOL15394571M

For cylindrical particles: Another article by J. Wu and B. Yu () [17] investigated resistant forces of granular porous media against the fluid flow, and formulated a novel resistance. For all composite sands, the observed flow resistance was higher than in the corresponding reference sand at equal d50, resulting in increased a coefficients by factors up toas well as.

1. Introduction. Porous structures are widely used in coastal engineering, e.g. breakwaters for sea defense. A number of studies have been carried out on numerical simulation of flow through and around such structures, e.g. Jensen et al.

(), Hsu et al. (), Liu et al. (), Losada et al. (), del Jesus et al. (), and Higuera et al., a, Higuera et al., by:   1. Introduction. Porous sound absorbers are common solutions to reduce the noise-related problems.

Porous structures absorb sound through inner tortuous layers and dissipate it into heat there have been continued interests in enhancing the absorption efficiency of sound absorber while maintaining the thickness, composite sound and vibration absorbing structures are Cited by:   Fig.

1 shows the metal separators with different porous flow fields consist of spherical alloy powders and the conventional groove type graphite separator examined in this study. In the preparation of all porous flow field type separators, firstly, highly corrosion-resistant Ni-base alloy (Ni–16Cr–16Mo–5Fe–4W mass%) spherical powders and corrosion-resistant stainless steel (Fe–17Cr.

Furthermore, due to the flow resistance made by the porous structure, the effect of natural convection is suppressed in the porous-PCM case. For the porous-PCM case, three different porosities of 95, 97 and 99% are studied compared with the pure PCM system and as mentioned the volume of the unit is expanded to have a same mass for the PCMs in.

Study of hydrogen transport through porous aluminum and composite membranes. Relief-like surface structure of the support membrane is clearly visible. It is observed that adhesion of polymer layer to etched Al support is very good.

This shows the asymmetric nature of the composite membrane due to the flow resistance offered by the support. The flow in porous media has received a great deal of attention due to its importance and many unresolved problems in science and engineering such as geophysics, soil science, underground water resources, petroleum engineering, fibrous composite manufacturing, biophysics (tissues.

Unit cells with different particle shapes have been extensively used in the literature to study the fluid flow through porous media such as LES and DNS study of turbulent flow in porous media.

These results give preliminary information on composite structure’s design for maximizing the energy absorption and hence increasing structure’s resistance to blast loads.

The paper is a sequel to Hassan and Batra’s paper [Composites B, ] wherein details of the damage model, verification of the code, and the validation of the. They are used as lightweight structures, filters, acoustic or heat insulation, scaffolds and support structures for catalysis applications.

Besides the low relative density, high temperature, as well local failure resistance, pore interconnectivity and permeability are interesting properties of porous ceramics.

Among the nine composite porous wicks, the composite porous wick with the spherical copper and the dendritic nickel powders and the mixing ratio ofand the particle size of μm and the volume ratio of 40% for the pore former, can achieve the highest porosity of % and the lowest effective thermal conductivity of W/(m•K).

The fundamentals of flow in the liquid composite moulding (LCM) processes are reviewed with an emphasis on multiphase flow effects considering the dual-scale thin porous media constituted by the.

In a book in which the problem of using axiomatic design in the fabrication of composite structure was approached, Lee and Suh referred inclusively to the ultrasonic machining [3].

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They. Digital Textbook Download (PDF) Apostolos Kantzas, PhD P. Eng. Jonathan Bryan, PhD P. Eng.

Download study of the flow resistance of composite porous structures PDF

Saeed Taheri, PhD The purpose of this manuscript is to provide the reader with the basic principles of flow in porous media and their association to hydrocarbon production from underground formations.

The intended audience is undergraduate and graduate students in petroleum engineering and associated. The flow resistance is one of the three physical parameters of a uniform, rigid, porous material which completely determine its acoustic behavior; for more complicated materials and sound absorbing structures the flow resistance gives at least some acoustic information.

In this study, novel PES composite membranes that featured with bi-continuous porous structure that contains well interconnected pores or voids, hydrophilic surface and high flux have been developed via VIPS method by regulating the additive mass ratio of Pluronic® F to PES, the relative humidity of vapor (RH), the dissolution and water vapor temperature (T) and the exposure time to.

Seyed Mostafa Hosseinalipour, Mohammadmehdi Namazi, Pore-scale numerical study of flow and conduction heat transfer in fibrous porous media, Journal of Mechanical Science and Technology, /s, (). The concept of tortuosity is used to characterize the structure of porous media, to estimate their electrical and hydraulic conductivity, and to study the travel time and length for tracer.

One of the technical issues of vanadium redox flow batteries with a carbon paper electrode and interdigitated flow channel is the relatively low current density due to insufficient active material transport downstream in the electrode and low reaction interface area.

In this study, we propose a new composite electrode structure, i.e., a porous carbon nanofiber layer that is partially added on. Finally, for an isotropic porous structure (the proper values of the resistance transformation are all equal and are termed the resistance coefficient) and an incompressible fluid, the functional dependence of the resistance coefficient is discussed with the Buckingham‐Pi theorem used for an Ellis model fluid, a power model fluid, a Newtonian.

This article presents a review of mathematical models used to study the flow of resin through fiber reinforcement. The general approach is to consider the resin as a fluid propagating through a porous medium: the mold (or die) cavity partially filled with fiber reinforcement and other filler material.

However, numerical and experimental studies show that flow resistance in porous media is largely determined by the geometry of the pore structure. In this study, the effect of the grain size distribution was analyzed using subangular-subrounded.

A study on convective aspects was carried out on a Couette flow in an irregular channel by applying a constant uniform magnetic field parallel to the channel flow. pdf ( MB) Effect of the multiple projectile on the low-velocity impact response of CNTs reinforced beam.

In this study, the influence mechanisms of graphene oxide (GO) on the membrane substrate/active layer for improving the water flux and anti-biofouling ability of thin-film composite (TFC) membranes in forward osmosis (FO) were systematically investigated.

We fabricated a pristine TFC membrane, a TFC membrane Editors’ collection: Graphene. Fundamentals of Fluid Flow in Porous Media Chapter 2 Formation Resistivity Factor Porous media consist of mineral, rock fragments and void space. The solids with exception of certain clay minerals (such as shaly sands where clay shales produce electrical conductivity) are nonconductive.

Generally the electrical property of a rock depends on void space geometry. A new model for resistance of flow through granular porous media is developed based on the average hydraulic radius model and the contracting–expanding channel model. This model is expressed as a function of tortuosity, porosity, ratio of pore diameter to throat diameter, diameter of particles, and fluid properties.

The two empirical constants, andin the Ergun equation are. The capillary flow porometer (Porous Materials Inc., USA) has been successfully used to evaluate pore structures of multilayer nonwovens. Determination of porosity of samples according to ISO standard, 5 samples were prepared at cm and determined by taking the average of the measurement values [ 19 ].

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() On the Beavers–Joseph Interface Condition for Non-parallel Coupled Channel Flow over a Porous Structure at High Reynolds Numbers. Transport in Porous Media() A conforming primal–dual mixed formulation for the 2D multiscale porous media flow problem.

The Steady Flow Resistance of Perforated Sheet Materials in High Speed Grazing Flows A study was conducted to determine the effects of high speed grazing air flow on the acoustic resistance of perforated sheet materials used in the construction of acoustically absorptive liners placed in commercial aircraft engine nacelles.

Since DC flow resistance of porous sheet materials is known to be a. Fundamentals of Fluid Flow in Porous Media Chapter 2 Porosity The rock texture consists of mineral grains of various shapes and sizes and its pore structure is extremely complex.

The most important factors of the pore structure are how much space there is between these grains and what their shapes are. That is because. Viscous resistance is actually the inverse of permeability value and it's regarding to resistance exerted to flow by porous media. As far as I know, there's nothing about hydraulic conductivity in modeling porous zone, but, if you mean the heat conductivity of the porous material, it should be defined by a UDF,due to anisotropic behavior of.In fluid mechanics, fluid flow through porous media is the manner in which fluids behave when flowing through a porous medium, for example sponge or wood, or when filtering water using sand or another porous material.

As commonly observed, some fluid flows through the media while some mass of the fluid is stored in the pores present in the media.