Some Notes on the Solution of Thermal Conduction Problems in Solids with Variable Thermal Properties

1963 ◽  
Vol 5 (2) ◽  
pp. 172-174 ◽  
Author(s):  
K. S. Chan
Keyword(s):  
Thermal Properties ◽  
Thermal Conduction

scholarly journals Microwave Absorption in Layered Media: Application to Landmine Detection

2000 ◽  
Vol 53 (5) ◽  
pp. 723 ◽  
Author(s):  
J. A. Hermann
Keyword(s):  
Thermal Properties ◽  
Microwave Absorption ◽  
Time Evolution ◽  
Microwave Radiation ◽  
Thermal Energy ◽  
Thermal Conduction ◽  
Landmine Detection ◽  
Composite Media ◽  
Conduction Model ◽  
One Dimensional

The absorption of microwave radiation and subsequent thermal conduction by simple composite media, consisting of parallel layers with disparate thermal properties,is analysed.The solutions for a one-dimensional conduction model are used to investigate the time evolution and distribution of thermal energy within moisture-laden soils containing non-absorbing objects.The application of these results to the detection of landmines is discussed and evaluated.

Heat Conduction of Fixator Pins with Polymethylmethacrylate External Fixation

1997 ◽  
Vol 10 (03) ◽  
pp. 153-159 ◽  
Author(s):  
J. L. Tomlinson ◽  
A. W. Hahn ◽  
G. M. Constantinescu ◽  
Colette Wagner-Mann ◽  
N. Williams
Keyword(s):  
Thermal Properties ◽  
Heat Conduction ◽  
External Fixation ◽  
Thermal Conduction ◽  
Thermal Injury ◽  
Animal Health ◽  
External Fixators ◽  
University Of Missouri ◽  
The University ◽  
Honor Society

SummaryThe purpose of this study was to determine the degree of thermal conduction along the fixation pins associated with acrylic external fixators and to develop a means of minimizing the potential for thermal injury. The data suggest that the degree of temperature conducted with 1.9 cm diameter acrylic external fixators was of minimal clinical significance if maintained a distance of one centimeter from the patient’s tissues. Larger diameter columns increase the potential for injury, however, this can be minimized with the use of a constant saline drip at the pin-acrylic interface to facilitate heat loss.This article describes the evaluation of thermal properties of polymethylmethacrylate external skeletal fixators. The data demonstrate heat conduction along the fixation pins. Thermal injury is theoretically minimized if columns are maintained a distance of at least one centimeter from the patient’s tissue.Research supported in part by and presented for the University of Missouri Pi Chapter of the Honor Society of Phi Zeta in coordination with SmithKline Beecham Animal Health, April 7, 1994

METHOD OF CALCULATION OF THERMAL PROPERTIES FOR BUILDING ENVELOPES WITH SCREEN INSULATION

2016 ◽  
Vol 6 (1) ◽  
pp. 4-7 ◽  
Author(s):  
Yuri Serafimovich VYTCHIKOV ◽  
Mikhail Evgen'evich SAPAREV
Keyword(s):  
Thermal Properties ◽  
Thermal Conduction ◽  
Numerical Data ◽  
Engineering Practice ◽  
Building Envelopes ◽  
Method Of Calculation ◽  
Thermal Screen ◽  
Air Ventilation ◽  
Resources Conservation ◽  
The Moment

The present research is performed in the framework of energy and resources conservation measures promotion in civil engineering. It introduces the perspectives of using thermal isolation in outer building envelopes and in air ventilation and conditioning systems insulation. The paper analyses the use of thermal screen isolation in building envelopes and air ventilation systems and proves that at the moment there is no methodology able to calculate these constructions in the existing engineering practice. The authors conducted a physical experiment to get reliable data on thermal screen isolation properties taking expanded polyethylene as a sample material. The results of the experiment as well as the obtained thermal conduction coefficient are presented in the paper. On the basis of the numerical data the authors introduce a verified methodology of calculation of thermal properties for building envelopes with screen insulation.

Effect of thermal conduction path deficiency on thermal properties of LEDs package

2016 ◽  
Vol 102 ◽  
pp. 251-260 ◽  
Author(s):  
Khaoula Ben Abdelmlek ◽  
Zouhour Araoud ◽  
Rabie Ghnay ◽  
Kamel Abderrazak ◽  
Kamel Charrada ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Thermal Conduction ◽  
Conduction Path

Temperature-dependent thermal properties of Ru/C multilayers

2017 ◽  
Vol 24 (5) ◽  
pp. 975-980 ◽  
Author(s):  
Shuai Yan ◽  
Hui Jiang ◽  
Hua Wang ◽  
Yan He ◽  
Aiguo Li ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Thermal Properties ◽  
Thermal Conduction ◽  
Annealing Temperature ◽  
Grazing Incidence ◽  
Temperature Dependent ◽  
X Ray ◽  
Wire Method ◽  
The Stability

Multilayers made of Ru/C are the most promising candidates when working in the energy region 8–20 keV. The stability of its thermal properties, including thermal expansion and thermal conduction, needs to be considered for monochromator or focusing components. Ru/C multilayers with periodic thicknesses of 3, 4 and 5 nm were investigatedin situby grazing-incidence X-ray reflectometry and diffuse scattering in order to study their thermal expansion characteristics as a function of annealing temperature up to 400°C. The thermal conductivity of multilayers with the same structure was also measured by the transient hot-wire method and compared with bulk values.

scholarly journals Coherent Thermal Conduction in Silicon Nanowires with Periodic Wings

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 142 ◽  
Author(s):  
Roman Anufriev ◽  
Masahiro Nomura
Keyword(s):  
Thermal Properties ◽  
Heat Conduction ◽  
Silicon Nanowires ◽  
Low Temperatures ◽  
Thermal Conduction ◽  
Phonon Dispersion ◽  
Thermal Conductance ◽  
Phononic Crystals ◽  
Periodic Nanostructures

Artificial periodic nanostructures, known as phononic crystals, promise to control the thermal properties of nanostructures in the coherent regime, which can be achieved in semiconductors at low temperatures. Here, we study coherent thermal conduction in silicon nanowires with added periodic wings at sub-Kelvin temperature. Our simulations show that the added periodic wings flatten the phonon dispersion and thus reduce the thermal conductance. We investigate the dependence of this reduction on the size of the wings and conclude that the reduction is mainly caused by the periodicity of the wings, rather than by local resonances in them. These findings help to better understand the mechanisms controlling coherent heat conduction in periodic resonant nanostructures.

scholarly journals Effect of textile woven fabric parameters on its thermal properties

2019 ◽  
Vol 70 (01) ◽  
pp. 15-20 ◽  
Author(s):  
HALAOUA SABRI ◽  
ROMDHANI ZOUHAIER ◽  
JEMNI ABDELMAJID
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Thermal Conduction ◽  
Fiber Type ◽  
Thermal Characteristics ◽  
Woven Fabric ◽  
Surface Mass ◽  
Weave Structure ◽  
Fabric Construction ◽  
The Relationship

This paper aims to investigate the relationship between fabric construction properties and its thermal properties. For this aim three basic weave structures, three fiber compositions, five surface mass and four thicknesses were used. The thermal convection resistance RCV, thermal conduction resistance RCD, adiathermic power and thermal conductivity of all fabric samples were determined. In this research the plain weave structure showed the highest thermal properties while the twill and satin weave depicted the lowest thermal characteristics. The fiber type affects deeply different thermal properties. The increase of the surface mass and thickness was directly bound to the adiathermic power, thermal resistance and the thermal conductivity.

A Quantum Mechanical Study of the Thermal Conduction Across a ZrB2-SiC Interface as a Function of Temperature and Strain

2011 ◽  
Author(s):  
Vikas Samvedi ◽  
Vikas Tomar
Keyword(s):  
Density Functional Theory ◽  
Thermal Properties ◽  
First Principles ◽  
Thermal Conduction ◽  
Density Functional ◽  
Basis Sets ◽  
Quantum Mechanical ◽  
Functional Theory ◽  
Mechanical Study ◽  
Quantum Mechanical Study

Atomistic analyses of thermal conduction across ZrB2/SiC based nanocomposite interface are performed using first principles density functional theory (DFT) with plane-wave basis sets. The changes in the thermal properties of nanocomposites have been analyzed under the effect of straining and temperature and compared for their phononic and electronic dependence.

A Software Tool Developed for Simplified Numerical Modeling of Thermal Conduction around Distorted Geothermal Boreholes

2017 ◽  
Vol 21 ◽  
pp. 529-534
Author(s):  
Augustin Leiter
Keyword(s):  
Mathematical Model ◽  
Numerical Modeling ◽  
Thermal Properties ◽  
Thermal Conduction ◽  
Numerical Models ◽  
Software Tool ◽  
Geothermal System ◽  
Drilling Process ◽  
Specialized Software ◽  
Simplified Mathematical Model

The geometric characteristics of multiple geothermal boreholes organized in a geothermal system affect its thermal efficiency. The location of boreholes and their verticality and straightness is often distorted during drilling process. This distortion then degrades thermal properties of such a system. To study this phenomenon a specialized software tool was developed for numerical modeling based on a simplified mathematical model. This paper describes software tool briefly and presents some initial numerical models of basic borehole arrangements solved by this tool. Paper also contains a verification calculated by specialized software FEFLOW.

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