A computer-controlled transient needle-probe thermal conductivity instrument for liquids

1986 ◽  
Vol 7 (2) ◽  
pp. 285-294 ◽  
Author(s):  
G. B. Asher ◽  
E. D. Sloan ◽  
M. S. Graboski
Keyword(s):  
Thermal Conductivity ◽  
Needle Probe ◽  
Computer Controlled

scholarly journals Efficiency of the Needle Probe Test for Evaluation of Thermal Conductivity of Composite Materials: Two-Scale Analysis

2014 ◽  
Vol 36 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Dariusz Łydżba ◽  
Adrian Różański ◽  
Magdalena Rajczakowska ◽  
Damian Stefaniuk
Keyword(s):  
Thermal Conductivity ◽  
Composite Materials ◽  
Numerical Simulations ◽  
Conductivity Measurement ◽  
Scale Analysis ◽  
Equivalent Conductivity ◽  
Inclusion Type ◽  
Two Phase ◽  
Needle Probe ◽  
Probe Test

Abstract The needle probe test, as a thermal conductivity measurement method, has become very popular in recent years. In the present study, the efficiency of this methodology, for the case of composite materials, is investigated based on the numerical simulations. The material under study is a two-phase composite with periodic microstructure of “matrix-inclusion” type. Two-scale analysis, incorporating micromechanics approach, is performed. First, the effective thermal conductivity of the composite considered is found by the solution of the appropriate boundary value problem stated for the single unit cell. Next, numerical simulations of the needle probe test are carried out. In this case, two different locations of the measuring sensor are considered. It is shown that the “equivalent” conductivity, derived from the probe test, is strongly affected by the location of the sensor. Moreover, comparing the results obtained for different scales, one can notice that the “equivalent” conductivity cannot be interpreted as the effective one for the composites considered. Hence, a crude approximation of the effective property is proposed based on the volume fractions of constituents and the equivalent conductivities derived from different sensor locations.

Needle Probe for Measuring Thermal Conductivity of Molten Salts

2020 ◽  
Author(s):  
B. Merritt ◽  
K. Davisy ◽  
M. Wilkerson ◽  
T. Munro ◽  
P. Hartvigsen
Keyword(s):  
Thermal Conductivity ◽  
Molten Salts ◽  
Needle Probe

Measurement of thermal conductivity with the needle probe

2003 ◽  
Vol 35/36 (2) ◽  
pp. 127-138 ◽  
Author(s):  
Neil Lockmuller ◽  
John Redgrove ◽  
L'udovít Kubičár
Keyword(s):  
Thermal Conductivity ◽  
Needle Probe

Doping and Alloying Trends in New Thermoelectric Materials

2001 ◽  
Vol 691 ◽  
Author(s):  
Sim Loo ◽  
Sangeeta Lal ◽  
Theodora Kyratsi ◽  
Duck-Young Chung ◽  
Kuei-Fang Hsu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Sample Preparation ◽  
Measurement System ◽  
Thermoelectric Materials ◽  
Bulk Materials ◽  
Preparation Time ◽  
Short Sample ◽  
Hall Effect Measurements ◽  
Computer Controlled

ABSTRACTNew thermoelectric bulk materials such as CsBi4Te6 have shown superior properties to traditional materials, however, optimal performance requires continuing investigations of doping and alloying trends. A recently modified high throughput measurement system is presented for doping and alloying investigations in several new thermoelectric materials. The modification includes a four-probe configuration for more accurate measurements while maintaining a relatively short sample preparation time. The system is fully computer controlled and provides flexible contacts to accommodate various sample dimensions. Optimal compositions are then identified for further investigations in thermoelectric prototype modules. The most promising materials will be further characterized for electrical conductivity, thermoelectric power, thermal conductivity, and Hall effect measurements as a function of temperature.

Estimating thermal diffusivity and specific heat from needle probe thermal conductivity data

2006 ◽  
Vol 77 (4) ◽  
pp. 044904 ◽  
Author(s):  
William F. Waite ◽  
Lauren Y. Gilbert ◽  
William J. Winters ◽  
David H. Mason
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Specific Heat ◽  
Conductivity Data ◽  
Thermal Conductivity Data ◽  
Needle Probe
Sign in / Sign up

Export Citation Format

Share Document