scholarly journals Stagnation point flow of carbon nanotubes over stretching cylinder with slip conditions

Open Physics ◽  
2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Tasawar Hayat ◽  
Muhammad Farooq ◽  
Ahmed Alsaedi
Keyword(s):  
Carbon Nanotubes ◽  
Stagnation Point ◽  
Multiwall Carbon Nanotubes ◽  
Convergent Series ◽  
Skin Friction Coefficient ◽  
Stagnation Point Flow ◽  
Single Wall Carbon Nanotubes ◽  
Stretching Cylinder ◽  
Slip Effects ◽  
Multiwall Carbon

AbstractThis work concentrates on stagnation point flow of a nanofluid over an impermeable stretching cylinder with mass transfer and slip effects. Carbon nanotubes (CNTs) and water are used as a nanofluid in the present investigation. Two types of CNTs are used as nanoparticles (i) Single-wall carbon nanotubes (SWCNTs) and (ii) multiwall carbon nanotubes (MWCNTs). Appropriate transformations are used to achieve a system of ordinary differential equations. Convergent series solutions are obtained. Behavior of various parameters on the velocity, temperature and concentration profiles are discussed graphically. Numerical values of skin friction coefficient, Nusselt number and Sherwood number are computed and analyzed.

scholarly journals The Separation Power of Nanotubes in Membranes: A Review

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Bart Van der Bruggen
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Water Filtration ◽  
Mixed Matrix Membranes ◽  
Single Wall Carbon Nanotubes ◽  
Fouling Resistance ◽  
Mixed Matrix ◽  
Separation Power ◽  
Multiwall Carbon ◽  
Potential Use

Research on mixed matrix membranes in which nanoparticles are used to enhance the membrane's performance in terms of flux, separation, and fouling resistance has boomed in the last years. This review probes on the specific features and benefits of one specific type of nanoparticles with a well-defined cylindrical structure, known as nanotubes. Nanotube structures for potential use in membranes are reviewed. These comprise mainly single-wall carbon nanotubes (SWCNTs) and multiwall carbon nanotubes (MWCNTs), but also other structures and materials, which are less studied for membrane applications, can be used. Important issues related to polymer-nanotube interactions such as dispersion and alignment are outlined, and a categorization is made of the resultant membranes. Applications are reviewed in four different areas, that is, gas separation, water filtration, drug delivery, and fuel cells.

MICROSCOPIC CHARACTERIZATION OF THIN-MULTIWALL CARBON NANOTUBES SYNTHESIZED BY CATALYTIC CVD METHOD WITH MESOPOROUS SILICA

NANO ◽  
2006 ◽  
Vol 01 (03) ◽  
pp. 207-212 ◽  
Author(s):  
PALANISAMY RAMESH ◽  
KENICHI SATO ◽  
YUJI OZEKI ◽  
MASAHITO YOSHIKAWA ◽  
NAOKI KISHI ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Mesoporous Silica ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Single Wall Carbon Nanotubes ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Structural Deformations ◽  
Multiwall Carbon

Carbon nanotubes with 1–6 walls have been grown on cobalt-loaded mesoporous silica (i.e., MCM41) by using acetylene catalytic chemical vapor deposition. It is found that titanium grafting on the MCM41 pore walls prior to cobalt loading promotes the growth of nanotubes with 1–6 walls. As-grown nanotube material is found to be a mixture of single-wall carbon nanotubes (SWNTs), double-wall carbon nanotubes (DWNTs) and thin-multiwall carbon nanotubes (t-MWNTs) with 3–6 walls. Annealing of the as-grown nanotubes has reduced the amount of SWNTs in the nanotube mixture. Several structural deformations of the t-MWNTs are observed during transmission electron microscopy (TEM) analysis. Complete or partial collapse of the t-MWNTs is also found due to these structural deformations. Graphite-like domains developed at the collapsed regions stabilize these structural deformations.

scholarly journals Significance of Double Stratification in Stagnation Point Flow of Third-Grade Fluid towards a Radiative Stretching Cylinder

Mathematics ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 1103 ◽  
Author(s):  
Anum Shafiq ◽  
Ilyas Khan ◽  
Ghulam Rasool ◽  
Asiful Seikh ◽  
El-Sayed Sherif
Keyword(s):  
Stagnation Point ◽  
Numerical Data ◽  
Convergent Series ◽  
Stagnation Point Flow ◽  
Third Grade ◽  
Brownian Diffusion ◽  
Stretching Cylinder ◽  
Double Stratification ◽  
Optimal Homotopy Analysis Method ◽  
The Impact

The present article is devoted to examine the significance of double stratification in third grade stagnation point flow towards a radiative stretching cylinder. The stagnation point is discussed categorically. Analysis is scrutinized in the presence of Thermophoresis, Brownian diffusion, double stratification and heat source/sink. Suitable typical transformations are used to drive the system of ordinary differential equation. The governing system is subjected to optimal homotopy analysis method (OHAM) for convergent series solutions. The impact of pertinent fluid parameters on the velocity field, temperature distribution and concentration of the nanoparticles is shown graphically. Numerical data is compiled in tabulare form for skin friction, Nusselt and Sherwood numbers to analyze the variation caused by the present model and to see the impact for industrial and engineering point of view.

scholarly journals MHD stagnation point flow of Jeffrey fluid by a radially stretching surface with viscous dissipation and Joule heating

2015 ◽  
Vol 63 (4) ◽  
pp. 311-317 ◽  
Author(s):  
Tasawar Hayat ◽  
Muhammad Waqas ◽  
Sabir Ali Shehzad ◽  
Ahmed Alsaedi
Keyword(s):  
Differential Equations ◽  
Stagnation Point ◽  
Viscous Dissipation ◽  
Joule Heating ◽  
Constitutive Relations ◽  
Coupled System ◽  
Convergent Series ◽  
Skin Friction Coefficient ◽  
Stagnation Point Flow ◽  
Jeffrey Fluid

AbstractThe steady stagnation-point flow of an electrically conducting fluid due to convectively heated stretched disk in the radial direction is considered. Effects of viscous dissipation and Joule heating are present. Mathematical modelling is based upon constitutive relations of Jeffrey fluid. The governing partial differential equations are first transformed into the coupled system of ordinary differential equations and then solved for the convergent series solutions. Numerical values of skin friction coefficient and local Nusselt number are also computed and analysed.

Boehmite Nanofibers as a Dispersant for Nanotubes in an Aqueous Sol

2018 ◽  
Author(s):  
Gen Hayase
Keyword(s):  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Aqueous Solutions ◽  
High Aspect Ratio ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Nanotube Films

By exploiting the dispersibility and rigidity of boehmite nanofibers (BNFs) with a high aspect ratio of 4 nm in diameter and several micrometers in length, multiwall-carbon nanotubes (MWCNTs) were successfully dispersed in aqueous solutions. In these sols, the MWCNTs were dispersed at a ratio of about 5–8% relative to BNFs. Self-standing BNF–nanotube films were also obtained by filtering these dispersions and showing their functionality. These films can be expected to be applied to sensing materials.

scholarly journals Comparative study of using Water-Based mud containing Multiwall Carbon Nanotubes versus Oil-Based mud in HPHT fields

2016 ◽  
Vol 25 (4) ◽  
pp. 459-464 ◽  
Author(s):  
M.I. Abduo ◽  
A.S. Dahab ◽  
Hesham Abuseda ◽  
Abdulaziz M. AbdulAziz ◽  
M.S. Elhossieny
Keyword(s):  
Carbon Nanotubes ◽  
Comparative Study ◽  
Multiwall Carbon Nanotubes ◽  
Water Based ◽  
Multiwall Carbon
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