**Commenced**in January 2007

**Frequency:**Monthly

**Edition:**International

**Paper Count:**5267

# Search results for: variable thermal conductivity

##### 5267 Stagnation Point Flow Over a Stretching Cylinder with Variable Thermal Conductivity and Slip Conditions

**Authors:**
M. Y. Malik,
Farzana Khan

**Abstract:**

**Keywords:**
slip conditions,
stretching cylinder,
heat generation/absorption,
stagnation point flow,
variable thermal conductivity

##### 5266 Three-Dimensional Generalized Thermoelasticity with Variable Thermal Conductivity

**Authors:**
Hamdy M. Youssef,
Mowffaq Oreijah,
Hunaydi S. Alsharif

**Abstract:**

**Keywords:**
thermoelasticity,
thermal conductivity,
Laplace transforms,
Fourier transforms

##### 5265 Annular Hyperbolic Profile Fins with Variable Thermal Conductivity Using Laplace Adomian Transform and Double Decomposition Methods

**Authors:**
Yinwei Lin,
Cha'o-Kuang Chen

**Abstract:**

**Keywords:**
fins,
thermal conductivity,
Laplace transform,
Adomian,
nonlinear

##### 5264 Soret and Dufour Effect on Variable Viscosity and Thermal Conductivity of an Inclined Magnetic Field with Dissipation in Non-Darcy Porous Medium

**Authors:**
Rasaq A. Kareem,
Sulyman O. Salawu

**Abstract:**

**Keywords:**
Dufour,
non-Darcy Flow,
Soret,
thermal conductivity,
variable viscosity

##### 5263 A Note on MHD Flow and Heat Transfer over a Curved Stretching Sheet by Considering Variable Thermal Conductivity

**Authors:**
M. G. Murtaza,
E. E. Tzirtzilakis,
M. Ferdows

**Abstract:**

**Keywords:**
curved stretching sheet,
finite difference method,
MHD,
variable thermal conductivity

##### 5262 Effects of Cattaneo-Christov Heat Flux on 3D Magnetohydrodynamic Viscoelastic Fluid Flow with Variable Thermal Conductivity

**Authors:**
Muhammad Ramzan

**Abstract:**

**Keywords:**
Cattaneo Christov heat flux,
homogenous-heterogeneous reactions,
magnetic field,
variable thermal conductivity

##### 5261 The Influence of Fiber Volume Fraction on Thermal Conductivity of Pultruded Profile

**Authors:**
V. Lukášová,
P. Peukert,
V. Votrubec

**Abstract:**

**Keywords:**
pultrusion profile,
volume fraction,
thermal conductivity,
numerical simulation

##### 5260 Comparing the Experimental Thermal Conductivity Results Using Transient Methods

**Authors:**
Sofia Mylona,
Dale Hume

**Abstract:**

**Keywords:**
accurate data,
liquids,
thermal conductivity,
transient methods.

##### 5259 Measurement of VIP Edge Conduction Using Vacuum Guarded Hot Plate

**Authors:**
Bongsu Choi,
Tae-Ho Song

**Abstract:**

**Keywords:**
envelope,
edge conduction,
thermal conductivity,
vacuum insulation panel

##### 5258 Thermal, Chemical, and Mineralogical Properties of Soil Building Blocks Reinforced with Cement

**Authors:**
Abdelmalek Ammari

**Abstract:**

**Keywords:**
compressed earth blocks,
thermal conductivity,
mineralogical,
chemical,
temperature

##### 5257 Thermal Conductivity and Optical Absorption of GaInAsSb/GaSb Laser Structure: Impact of Annealing Time

**Authors:**
Soufiene Ilahi,
Noureddine Yacoubi

**Abstract:**

**Keywords:**
thermal conductivity,
bandgap energy of GaInAsSb,
GaInAsSb active layer,
optical absorption

##### 5256 Effect of Particles Size and Volume Fraction Concentration on the Thermal Conductivity and Thermal Diffusivity of Al2O3 Nanofluids Measured Using Transient Hot–Wire Laser Beam Deflection Technique

**Authors:**
W. Mahmood Mat Yunus,
Faris Mohammed Ali,
Zainal Abidin Talib

**Abstract:**

**Keywords:**
transient hot wire-laser beam technique,
Al2O3 nanofluid,
particle size,
volume fraction concentration

##### 5255 Thermal Properties of the Ground in Cyprus and Their Correlations and Effect on the Efficiency of Ground Heat Exchangers

**Authors:**
G. A. Florides,
E. Theofanous,
I. Iosif-Stylianou,
P. Christodoulides,
S. Kalogirou,
V. Messarites,
Z. Zomeni,
E. Tsiolakis,
P. D. Pouloupatis,
G. P. Panayiotou

**Abstract:**

**Keywords:**
ground heat exchangers,
ground thermal conductivity,
ground thermal diffusivity,
ground thermal properties

##### 5254 Estimation of Uncertainty of Thermal Conductivity Measurement with Single Laboratory Validation Approach

**Authors:**
Saowaluck Ukrisdawithid

**Abstract:**

**Keywords:**
single laboratory validation approach,
within-laboratory reproducibility,
method and laboratory bias,
certified reference material

##### 5253 Study on the Thermal Conductivity about Porous Materials in Wet State

**Authors:**
Han Yan,
Jieren Luo,
Qiuhui Yan,
Xiaoqing Li

**Abstract:**

**Keywords:**
porous materials,
thermal conductivity,
moisture content,
transient hot-wire method

##### 5252 An Attempt to Improve Student´s Understanding on Thermal Conductivity Using Thermal Cameras

**Authors:**
Mariana Faria Brito Francisquini

**Abstract:**

**Keywords:**
teaching physics,
thermal cameras,
thermal conductivity,
thermal physics

##### 5251 Determination of Thermophysical Properties of Water Based Magnetic Nanofluids

**Authors:**
Eyüphan Manay,
Bayram Sahin,
Emre Mandev,
Ibrahim Ates,
Tuba Yetim

**Abstract:**

_{2}O

_{4}-water and CoFe

_{2}O

_{4}-water). Magnetic nanoparticles were dispersed into the pure water at different volume fractions from 0 vol.% to 4 vol.%. The measurements were performed in the temperature range of 15

^{o}C-55

^{o}C. In order to get better idea on the temperature dependent thermophysical properties of magnetic nanofluids (MNFs), viscosity and thermal conductivity measurements were made. SEM images of both NiFe

_{2}O

_{4}and CoFe

_{2}O

_{4 }nanoparticles were used in order to confirm the average dimensions. The measurements showed that the thermal conductivity of MNFs increased with an increase in the volume fraction as well as viscosity. Increase in the temperature of both MNFs resulted in an increase in the thermal conductivity and a decrease in the viscosity. Based on the measured data, the correlations for both the viscosity and the thermal conductivity were presented with respect to solid volume ratio and temperature. Effective thermal conductivity of the prepared MNFs was also calculated. The results indicated that water based NiFe

_{2}O

_{4 }nanofluid had higher thermal conductivity than that of the CoFe

_{2}O

_{4}. Once the viscosity values of both MNFs were compared, almost no difference was observed.

**Keywords:**
magnetic nanofluids,
thermal conductivity,
viscosity,
nife2o4-water,
cofe2o4-water

##### 5250 Using the Transient Plane Source Method for Measuring Thermal Parameters of Electroceramics

**Authors:**
Peter Krupa,
Svetozár Malinarič

**Abstract:**

**Keywords:**
TPS method,
thermal conductivity,
thermal diffusivity,
thermal analysis,
electro-ceramics,
firing

##### 5249 Degradation of Irradiated UO2 Fuel Thermal Conductivity Calculated by FRAPCON Model Due to Porosity Evolution at High Burn-Up

**Authors:**
B. Roostaii,
H. Kazeminejad,
S. Khakshournia

**Abstract:**

_{2}fuel is utilized to study the degradation of irradiated UO

_{2}thermal conductivity calculated by the FRAPCON model of thermal conductivity. A porosity correction factor is developed based on the assumption that the fuel morphology is a three-phase type, consisting of the as-fabricated pores and pores due to intergranular bubbles whitin UO

_{2}matrix and solid fission products. The predicted thermal conductivity demonstrates an additional degradation of 27% due to porosity formation at burn-up levels around 120 MWd/kgU which would cause an increase in the fuel temperature accordingly. Results of the calculations are compared with available data.

**Keywords:**
irradiation-induced recrystallization,
matrix swelling,
porosity evolution,
UO₂ thermal conductivity

##### 5248 Mapping Thermal Properties Using Resistivity, Lithology and Thermal Conductivity Measurements

**Authors:**
Riccardo Pasquali,
Keith Harlin,
Mark Muller

**Abstract:**

**Keywords:**
thermal conductivity,
ground source heat pumps,
resistivity,
heat exchange,
shallow geothermal,
Ireland

##### 5247 [Keynote Talk]: Thermal Performance of Common Building Insulation Materials: Operating Temperature and Moisture Effect

**Authors:**
Maatouk Khoukhi

**Abstract:**

**Keywords:**
building insulation material,
moisture content,
operating temperature,
thermal conductivity

##### 5246 Effect of Surfactant on Thermal Conductivity of Ethylene Glycol/Silver Nanofluid

**Authors:**
E. C. Muhammed Irshad

**Abstract:**

**Keywords:**
k-thermal conductivity,
sodium dodecyl sulfate,
vinyl pyrrolidone,
mechatronics engineering

##### 5245 The Effect of Nanofiber Web on Thermal Conductivity, Air and Water Vapor Permeability

**Authors:**
Ilkay Ozsev Yuksek,
Nuray Ucar,
Zeynep Esma Soygur,
Yasemin Kucuk

**Abstract:**

**Keywords:**
nanofiber/fabric composites,
electrospinning,
isolation,
thermal conductivity,
moisture vapor transport,
air permeability

##### 5244 Thermal Conductivity of Al2O3/Water-Based Nanofluids: Revisiting the Influences of pH and Surfactant

**Authors:**
Nizar Bouguerra,
Ahmed Khabou,
Sébastien Poncet,
Saïd Elkoun

**Abstract:**

_{2}O

_{3}-water based nanofluids. Though they have been widely considered in the past, to the best of our knowledge, there is no clear consensus about a proper way to prepare and stabilize them by the appropriate surfactant. In this paper, a careful experimental investigation is performed to quantify the combined influence of pH and the surfactant on the stability of Al

_{2}O

_{3}-water based nanofluids. Two volume concentrations of nanoparticles and three nanoparticle sizes have been considered. The good preparation and stability of these nanofluids are evaluated through thermal conductivity measurements. The results show that the optimum value for the thermal conductivity is obtained mainly by controlling the pH of the mixture and surfactants are not necessary to stabilize the solution.

**Keywords:**
nanofluid,
thermal conductivity,
pH,
transient hot wire,
surfactant,
Al2O3,
stability,
dispersion,
preparation

##### 5243 The Influence of Water and Salt Crystals Content on Thermal Conductivity Coefficient of Red Clay Brick

**Authors:**
Dalia Bednarska,
Marcin Koniorczyk

**Abstract:**

**Keywords:**
building materials,
red clay brick,
sodium sulfate,
thermal conductivity coefficient

##### 5242 Molecular Dynamics Simulation of the Effect of the Solid Gas Interface Nanolayer on Enhanced Thermal Conductivity of Copper-CO2 Nanofluid

**Authors:**
Zeeshan Ahmed,
Ajinkya Sarode,
Pratik Basarkar,
Atul Bhargav,
Debjyoti Banerjee

**Abstract:**

_{2}in oil recovery and in CO

_{2}capture and storage is gaining traction in recent years. These applications involve heat transfer between CO

_{2}and the base fluid, and hence, there arises a need to improve the thermal conductivity of CO

_{2}to increase the process efficiency and reduce cost. One way to improve the thermal conductivity is through nanoparticle addition in the base fluid. The nanofluid model in this study consisted of copper (Cu) nanoparticles in varying concentrations with CO

_{2}as a base fluid. No experimental data are available on thermal conductivity of CO

_{2}based nanofluid. Molecular dynamics (MD) simulations are an increasingly adopted tool to perform preliminary assessments of nanoparticle (NP) fluid interactions. In this study, the effect of the formation of a nanolayer (or molecular layering) at the gas-solid interface on thermal conductivity is investigated using equilibrium MD simulations by varying NP diameter and keeping the volume fraction (1.413%) of nanofluid constant to check the diameter effect of NP on the nanolayer and thermal conductivity. A dense semi-solid fluid layer was seen to be formed at the NP-gas interface, and the thickness increases with increase in particle diameter, which also moves with the NP Brownian motion. Density distribution has been done to see the effect of nanolayer, and its thickness around the NP. These findings are extremely beneficial, especially to industries employed in oil recovery as increased thermal conductivity of CO

_{2}will lead to enhanced oil recovery and thermal energy storage.

**Keywords:**
copper-CO2 nanofluid,
molecular dynamics simulation,
molecular interfacial layer,
thermal conductivity

##### 5241 Effects of Aging on Thermal Properties of Some Improved Varieties of Cassava (Manihot Esculenta) Roots

**Authors:**
K. O. Oriola,
A. O. Raji,
O. E. Akintola,
O. T. Ismail

**Abstract:**

**Keywords:**
thermal conductivity,
thermal diffusivity,
specific heat capacity,
moisture content,
tuber age

##### 5240 Effect of Temperature and CuO Nanoparticle Concentration on Thermal Conductivity and Viscosity of a Phase Change Material

**Authors:**
V. Bastian Aguila,
C. Diego Vasco,
P. Paula Galvez,
R. Paula Zapata

**Abstract:**

**Keywords:**
NanoPCM,
thermal conductivity,
viscosity,
non-Newtonian fluid

##### 5239 The Analysis of Thermal Conductivity in Porcine Meat Due to Electricity by Finite Element Method

**Authors:**
Orose Rugchati,
Sarawut Wattanawongpitak

**Abstract:**

**Keywords:**
thermal conductivity,
porcine meat,
electricity,
finite element method

##### 5238 Numerical Study of Heat Transfer in Silica Aerogel

**Authors:**
Amal Maazoun,
Abderrazak Mezghani,
Ali Ben Moussa

**Abstract:**

**Keywords:**
aerogel,
fractal structure,
numerical study,
porous media,
thermal conductivity