scholarly journals Periodic unit cell reconstruction of porous media: Application to open-cell aluminum foams

2007 ◽  
Vol 101 (11) ◽  
pp. 113538 ◽  
Author(s):  
Camille Perrot ◽  
Raymond Panneton ◽  
Xavier Olny
Keyword(s):  
Porous Media ◽  
Unit Cell ◽  
Aluminum Foams ◽  
Open Cell ◽  
Periodic Unit Cell

scholarly journals Simulation of Thermal Transport in Open-Cell Metal Foams: Effect of Periodic Unit Cell Structure

2006 ◽  
Author(s):  
Shankar Krishnan ◽  
Suresh V. Garimella ◽  
Jayathi Y. Murthy
Keyword(s):  
Thermal Transport ◽  
Pore Space ◽  
Cell Structure ◽  
Flow Characteristics ◽  
Metal Foams ◽  
Unit Cube ◽  
Unit Cell ◽  
Face Centered Cubic ◽  
Open Cell ◽  
Periodic Unit Cell

Direct simulation of thermal transport in open-cell metal foams is conducted using different periodic unit cell geometries. The periodic unit cell structures are constructed by assuming the pore space to be spherical and subtracting the pore space from a unit cube of the metal. Different types of packing arrangement for spheres are considered - Body Centered Cubic, Face Centered Cubic, and the A15 lattice (similar to a Weaire-Phelan unit cell) - which give rise to different foam structures. Effective thermal conductivity, pressure drop and Nusselt number are computed by imposing periodic boundary conditions for aluminum foams saturated with air or water. The computed values compare well with existing experimental measurements and semi-empirical models for porosities greater than 80%. The effect of different foam packing arrangements on the computed thermal and fluid flow characteristics is discussed. The capabilities and limitations of the present approach are identified.

scholarly journals An experimentally validated and parameterized periodic unit-cell reconstruction of open-cell foams

2011 ◽  
Vol 109 (10) ◽  
pp. 103519 ◽  
Author(s):  
P. De Jaeger ◽  
C. T’Joen ◽  
H. Huisseune ◽  
B. Ameel ◽  
M. De Paepe
Keyword(s):  
Unit Cell ◽  
Open Cell ◽  
Open Cell Foams ◽  
Periodic Unit Cell

scholarly journals Simulation of Thermal Transport in Open-Cell Metal Foams: Effect of Periodic Unit-Cell Structure

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
Shankar Krishnan ◽  
Suresh V. Garimella ◽  
Jayathi Y. Murthy
Keyword(s):  
Thermal Transport ◽  
Pore Space ◽  
Cell Structure ◽  
Flow Characteristics ◽  
Metal Foams ◽  
Unit Cube ◽  
Unit Cell ◽  
Face Centered Cubic ◽  
Open Cell ◽  
Periodic Unit Cell

Direct simulation of thermal transport in open-cell metal foams is conducted using different periodic unit-cell geometries. The periodic unit-cell structures are constructed by assuming the pore space to be spherical and subtracting the pore space from a unit cube of the metal. Different types of packing arrangement for spheres are considered—body centered cubic, face centered cubic, and the A15 lattice (similar to a Weaire-Phelan unit cell)—which give rise to different foam structures. Effective thermal conductivity, pressure drop, and Nusselt number are computed by imposing periodic boundary conditions for aluminum foams saturated with air or water. The computed values compare well with existing experimental measurements and semiempirical models for porosities greater than 80%. The effect of different foam packing arrangements on the computed thermal and fluid flow characteristics is discussed. The capabilities and limitations of the present approach are identified.

Direct Simulation of Transport in Open-Cell Metal Foam

2006 ◽  
Vol 128 (8) ◽  
pp. 793-799 ◽  
Author(s):  
Shankar Krishnan ◽  
Jayathi Y. Murthy ◽  
Suresh V. Garimella
Keyword(s):  
Metal Foam ◽  
Flow Characteristics ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Unit Cell ◽  
Computational Time ◽  
Small Scale ◽  
Direct Simulation ◽  
Open Cell ◽  
Periodic Unit Cell

Flows in porous media may be modeled using two major classes of approaches: (a) a macroscopic approach, where volume-averaged semiempirical equations are used to describe flow characteristics, and (b) a microscopic approach, where small-scale flow details are simulated by considering the specific geometry of the porous medium. In the first approach, small-scale details are ignored and the information so lost is represented in the governing equations using an engineering model. In the second, the intricate geometry of the porous structures is accounted for and the transport through these structures computed. The latter approach is computationally expensive if the entire physical domain were to be simulated. Computational time can be reduced by exploiting periodicity when it exists. In the present work we carry out a direct simulation of the transport in an open-cell metal foam using a periodic unit cell. The foam geometry is created by assuming the pore to be spherical. The spheres are located at the vertices and at the center of the unit cell. The periodic foam geometry is obtained by subtracting the unit cell cube from the spheres. Fluid and heat flow are computed in the periodic unit cell. Our objective in the present study is to obtain the effective thermal conductivity, pressure drop, and local heat transfer coefficient from a consistent direct simulation of the open-cell foam structure. The computed values compare well with the existing experimental measurements and semiempirical models for porosities greater than 94%. The results and the merits of the present approach are discussed.

scholarly journals Direct Simulation of Transport in Open-Cell Metal Foams

2005 ◽  
Author(s):  
Shankar Krishnan ◽  
Jayathi Y. Murthy ◽  
Suresh V. Garimella
Keyword(s):  
Metal Foam ◽  
Flow Characteristics ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Unit Cell ◽  
Small Scale ◽  
Direct Simulation ◽  
Open Cell ◽  
Semi Empirical ◽  
Periodic Unit Cell

Flows in porous media may be modeled using either a macroscopic approach, where volume-averaged semi-empirical equations are used to describe flow characteristics, or a microscopic approach, where small-scale flow details are simulated by considering the specific geometry of the porous medium. A direct simulation of the transport in an open-cell metal foam is carried out in the present study using a periodic unit cell. The foam geometry is created by assuming the pore to be spherical. The spheres are located at the vertices and at the center of the unit cell. The periodic foam geometry is obtained by subtracting the unit cell cube from the spheres. Fluid and heat flow are computed in the periodic unit cell. The objective of the present study is to obtain the effective thermal conductivity, pressure drop and local heat transfer coefficient from a consistent direct simulation of the open-cell foam structure. The computed values compare well with the existing experimental measurements and semi-empirical models. The results and the merits of the present approach are discussed.

scholarly journals Compressive Behavior of Open-Cell Titanium Foams with Different Unit Cell Geometries

2017 ◽  
Vol 58 (11) ◽  
pp. 1587-1592 ◽  
Author(s):  
Xue-Zheng Yue ◽  
Keiji Matsuo ◽  
Koichi Kitazono
Keyword(s):  
Unit Cell ◽  
Compressive Behavior ◽  
Open Cell

A novel method for making open cell aluminum foams by powder sintering process

2005 ◽  
Vol 59 (26) ◽  
pp. 3333-3336 ◽  
Author(s):  
B. Jiang ◽  
N.Q. Zhao ◽  
C.S. Shi ◽  
X.W. Du ◽  
J.J Li ◽  
...  
Keyword(s):  
Sintering Process ◽  
Aluminum Foams ◽  
Open Cell ◽  
Powder Sintering ◽  
Novel Method

The Effects of Compression and Pore Size Variations on the Liquid Flow Characteristics in Metal Foams

2001 ◽  
Vol 124 (1) ◽  
pp. 263-272 ◽  
Author(s):  
K. Boomsma ◽  
D. Poulikakos
Keyword(s):  
Flow Characteristics ◽  
Maximum Flow ◽  
Metal Foams ◽  
Heat Sinks ◽  
Convection Heat ◽  
Hydraulic Characteristics ◽  
Aluminum Foams ◽  
Transitional Regime ◽  
Open Cell ◽  
Flow Velocities

Open-cell aluminum foams were investigated using water to determine their hydraulic characteristics. Maximum fluid flow velocities achieved were 1.042 m/s. The permeability and form coefficient varied from 2.46×10−10 m2 and 8701 m−1 to 3529×10−10 m2 and 120 m−1, respectively. It was determined that the flowrate range influenced these calculated parameters, especially in the transitional regime where the permeability based Reynolds number varied between unity and 26.5. Beyond the transition regime where ReK≳30, the permeability and form coefficient monotonically approached values which were reported as being calculated at the maximum flow velocities attained. The results obtained in this study are relevant to engineering applications employing metal foams ranging from convection heat sinks to filters and flow straightening devices.

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