Characterization of laminar flow in periodic open-cell porous structures

2019 ◽  
Vol 201 ◽  
pp. 397-412 ◽  
Author(s):  
Pedro Jorge ◽  
Miguel A.A. Mendes ◽  
Eric Werzner ◽  
José M.C. Pereira
Keyword(s):  
Laminar Flow ◽  
Porous Structures ◽  
Open Cell

Acoustical and mechanical characterization of anisotropic open-cell foams

1998 ◽  
Vol 104 (5) ◽  
pp. 2622-2627 ◽  
Author(s):  
M. Melon ◽  
E. Mariez ◽  
C. Ayrault ◽  
S. Sahraoui
Keyword(s):  
Mechanical Characterization ◽  
Open Cell ◽  
Open Cell Foams

scholarly journals CHARACTERIZATION OF OPEN CELL SIC FOAM MATERIAL

2012 ◽  
Vol 38 ◽  
pp. 225-239 ◽  
Author(s):  
Irena Zivkovic ◽  
Axel Murk
Keyword(s):  
Foam Material ◽  
Open Cell

3D Porous Graphene/Polyvinyl Alcohol Composites: The Effect of Modification on the Adsorption Properties

NANO ◽  
2016 ◽  
Vol 11 (11) ◽  
pp. 1650125 ◽  
Author(s):  
Shuang Sun ◽  
Xiaofei Ma
Keyword(s):  
Polyvinyl Alcohol ◽  
Graphene Nanosheets ◽  
Adsorption Properties ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Porous Structures ◽  
Edta Solution ◽  
Pseudo Second Order

Polyvinyl alcohol (PVA) was grafted on graphene nanosheets (GN) in the reduction of graphene oxide with hydrazine hydrate. The obtained GN-PVA (GP) suspension was treated with the freezing–thawing cycle to fabricate 3D porous monolithic GP materials, which were modified with carbon disulfide to introduce xanthan groups on the wall of porous materials, marked as GPCs. The characterization of GPCs confirmed that PVA was attached on the surface of GNs, and xanthan groups were effectively functionalized on the porous structures, which were composed of randomly oriented GNs. The Pb[Formula: see text] adsorption pattern for GPC materials was investigated. The kinetic adsorption and isotherm data fit the pseudo second-order kinetic and the Langmuir isotherm models, respectively. The maximum adsorption capacity of Pb[Formula: see text] reached 242.7[Formula: see text]mg/g. And GPCs for Pb[Formula: see text] adsorption could be regenerated with ethylenediamine tetracetic acid (EDTA) solution for repetitious adsorption.

Characterization of Permeability for Solid Freeform Fabricated Porous Structures

1999 ◽  
Author(s):  
Merve Erdal ◽  
Levent Ertoz ◽  
Selçuk Güçeri
Keyword(s):  
Solid Freeform Fabrication ◽  
Pore Geometry ◽  
Fluid Viscosity ◽  
Porous Structures ◽  
Permeability Measurement ◽  
Porous Flow ◽  
Freeform Fabrication ◽  
Fused Deposition ◽  
Order Of Magnitude

Abstract Fused deposition based solid freeform fabrication technique allows manufacturing of potential functional preforms for subsequent Resin Transfer Molding. In this study, the transport property (permeability) of solid freeform fabricated porous preform geometries are investigated. Specifically the effect of pore geometry and network on the permeability is sought. Wet (saturated) permeability experiments were performed for various pore geometries with different viscosity liquids. For all fluids and preform structures investigated in this study, the porous flow exhibited Darcian behavior. The permeability is affected by changes in order of magnitude of fluid viscosity, the effect considerably significant in low porosity preforms. Current work concentrates on dry permeability measurement and development of numerical permeability models for ordered pore geometries (as produced through SFF) that will be compared with experimental results.

Characterization of Complex Porous Structures for Reusable Thermal Protection Systems: Porosity Measurements

2015 ◽  
Vol 52 (1) ◽  
pp. 166-176 ◽  
Author(s):  
S. Gulli ◽  
L. Maddalena ◽  
C. McKelvey ◽  
A. Brown ◽  
Y. Nikishkov ◽  
...  
Keyword(s):  
Thermal Protection ◽  
Porous Structures ◽  
Thermal Protection Systems ◽  
Protection Systems ◽  
Porosity Measurements

Fabrication and Characterization of Superhydrophobic Film on Titanium Substrate

2013 ◽  
Vol 834-836 ◽  
pp. 29-32
Author(s):  
Dong Ping Long ◽  
Jian Rong Xue ◽  
Zhi Xin Yan
Keyword(s):  
Contact Angle ◽  
Titanium Substrate ◽  
Electrochemical Anodization ◽  
Porous Structures ◽  
Test Results ◽  
Nano Structure ◽  
Low Surface Energy ◽  
Nano Structures ◽  
Fluorinated Silane

TiO2 nano film with different nano structure were prepared on the surfaces of titanium TA1 and titanium alloy TC4 via electrochemical anodization. The surface morphology was observed with SEM, and it is found that TiO2 films prepared on TA1 surface have porous structures, while the TiO2 films synthesized on TC4 surface look like nano rod. The contact angle(CA) test results show that the TiO2 nano film prepared on TA1 is hydrophilicity and the CA is about 19°,the film on the TC4 is super hydrophilicity and its CA is smaller than 2°. After combined with fluorinated silane the self-assembled film synthesized on the surfaces and they are superhy- drophobic and the Contact angle is 150° and 158° respectively. It is concluded that both nano- structures and fluoroalkysilanes with low surface energy have play an important role in the wettability with the contact angle is more than 150°. The surface only have nano roughness without the low energy does not show superhydrophobicity.

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