Determination of the coefficient of thermal conductivity and heat capacity per unit volume in a multilayer medium

1998 ◽  
Vol 90 (2) ◽  
pp. 2042-2047 ◽  
Author(s):  
S. M. Koval'chuk
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Unit Volume ◽  
Multilayer Medium ◽  
Coefficient Of Thermal Conductivity

Determination of the Thermal Properties of a PCB by Coupled Numerical and Experimental Approach

2020 ◽  
Author(s):  
Yener Usul ◽  
Mustafa Özçatalbaş
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Properties ◽  
Numerical Analysis ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Thermal Analyses ◽  
Analysis Model ◽  
Linear Temperature ◽  
Coefficient Of Thermal Conductivity

Abstract Increasing demand for usage of electronics intensely in narrow enclosures necessitates accurate thermal analyses to be performed. Conduction based FEM (Finite Element Method) is a common and practical way to examine the thermal behavior of an electronic system. First step to perform a numerical analysis for any system is to set up the correct analysis model. In this paper, a method for obtaining the coefficient of thermal conductivity and specific heat capacity of a PCB which has generally a complex composite layup structure composed of conductive layers, and dielectric layers. In the study, above mentioned properties are obtained performing a simple nondestructive experiment and a numerical analysis. In the method, a small portion of PCB is sandwiched from one side at certain pressure by jaws. A couple of linear temperature profiles are applied to the jaws successively. Unknown values are tuned in the analysis model until the results of FEM analysis and experiment match. The values for the coefficient of thermal conductivity and specific heat capacity which the experiment and numerical analysis results match can be said to be the actual values. From this point on, the PCB whose thermal properties are determined can be analyzed numerically for any desired geometry and boundary condition.

scholarly journals Numerical identification of the thermal conductivity tensor and the heat capacity per unit volume of an anisotropic material

2019 ◽  
Vol 20 (6) ◽  
pp. 603
Author(s):  
Kossi Atchonouglo ◽  
Jean-Christophe Dupré ◽  
Arnaud Germaneau ◽  
Claude Vallée
Keyword(s):  
Thermal Conductivity ◽  
Finite Element Method ◽  
Heat Capacity ◽  
Unit Volume ◽  
Time Integration ◽  
Volume Measurement ◽  
Conductivity Tensor ◽  
Inverse Approach ◽  
Thermal Conductivity Tensor ◽  
Principal Axes

In this paper, an inverse approach based on gradient conjugate method for thermal conductivity tensor and heat capacity per unit volume measurement is summarized. A suitable analysis is done for the mesh in finite element method and for the time steps for the time integration. For a composite material, it is shown the importance to identify the thermal conductivity tensor components in the principal axes.

Determination of the coefficient of thermal conductivity of glass and polymer fibers

1969 ◽  
Vol 26 (9) ◽  
pp. 523-526 ◽  
Author(s):  
O. F. Shlenskii ◽  
N. I. Goncharuk ◽  
V. Ya. Gal'tsov
Keyword(s):  
Thermal Conductivity ◽  
Polymer Fibers ◽  
Coefficient Of Thermal Conductivity

Low-effort determination of heat capacity and thermal conductivity for cylindrical 18650 and 21700 lithium-ion cells

2021 ◽  
Vol 42 ◽  
pp. 103065
Author(s):  
Marco Steinhardt ◽  
Elisabeth Irene Gillich ◽  
Alexander Rheinfeld ◽  
Ludwig Kraft ◽  
Markus Spielbauer ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Lithium Ion ◽  
Lithium Ion Cells

Photoacoustic determination of heat capacity per unit volume at room temperature of thin metallic foils

2003 ◽  
Vol 74 (1) ◽  
pp. 845-847 ◽  
Author(s):  
G. Gutiérrez-Juárez ◽  
M. Vargas-Luna ◽  
J. J. Camacho-Espinosa ◽  
M. Sosa ◽  
J. L. González-Solı́s ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Room Temperature ◽  
Unit Volume ◽  
Metallic Foils

scholarly journals Characteristics and properties of Bitlis ignimbrites and their environmental implications

2020 ◽  
Vol 70 (338) ◽  
pp. 214
Author(s):  
E. Işık ◽  
A. Büyüksaraç ◽  
E. Avşar ◽  
M. F. Kuluöztürk ◽  
M. Günay
Keyword(s):  
Thermal Conductivity ◽  
Construction Material ◽  
Metal Extraction ◽  
Ultrasonic Speed ◽  
Environmental Implications ◽  
Volcanic Origin ◽  
Speed Test ◽  
Subsequent Transformation ◽  
Coefficient Of Thermal Conductivity

Bitlis rock is used as a construction material and comes from the lava emitted by volcanoes and their subsequent transformation into ignimbrites. This type of rocks has been characterized physically, chemi­cally, toxicologically and radioactively using different procedures including determination of the coefficient of thermal conductivity, gamma spectrometry, ultrasonic speed test, ICP masses and metal extraction. The results indicate that Bitlis rocks have an ACI greater than 1, although their content of radon is lower than other rocks of volcanic origin. Leaching of metals from these rocks indicates that Pb and Cd can provide an infiltration level in the field higher than the level permitted by TCLP and they have undesired toxicological risks. The percent­ages of extraction of other metals also point to this infiltration problem. Despite this, the material offers good qualities for usage as a building material such as its thermal coefficients.

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