Determination of thermal conductivity and emissivity of electromagnetically levitated high-temperature droplet based on the periodic laser-heating method: Theory

2007 ◽  
Vol 50 (15-16) ◽  
pp. 3054-3061 ◽  
Author(s):  
Takao Tsukada ◽  
Hiroyuki Fukuyama ◽  
Hidekazu Kobatake
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Laser Heating ◽  
Heating Method ◽  
Electromagnetically Levitated

Automated Determination of Protein-Nitrogen in Cereals and Grains

1977 ◽  
Vol 60 (6) ◽  
pp. 1238-1242
Author(s):  
Robert N Revesz ◽  
Norman Aker
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Organic Material ◽  
Combustion Products ◽  
Direct Reading ◽  
Protein Nitrogen ◽  
Operational Characteristics ◽  
Temperature Sample ◽  
Automated Determination

Abstract This paper presents the design, performance, and operational characteristics of a new direct reading instrument for determining nitrogen in cereal and grain. Precision, accuracy, range, speed, ease of operation, sensitivity, sample size, and flexibility of the instrument are presented. Results on various cereals and grains are presented and compared with those obtained by the Kjeldahl technique. The apparatus is the result of research for a rapid method for determining nitrogen in organic material. The instrument uses a combination of a unique high temperature sample oxidation, a sampling valve for separating combustion products, and thermal conductivity detection for the liberated nitrogen in a helium carrier gas.

scholarly journals Rapid determination of the high cycle fatigue properties of high temperature aeronautical alloys by self-heating measurements

2018 ◽  
Vol 165 ◽  
pp. 22022
Author(s):  
Vincent Roué ◽  
Cédric Doudard ◽  
Sylvain Calloch ◽  
Frédéric Montel ◽  
Quentin Pujol D’Andrebo ◽  
...  
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
High Cycle Fatigue ◽  
Rapid Determination ◽  
The Self ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Heating Method ◽  
Self Heating

The determination of high cycle fatigue (HCF) properties of a material with standard method requires a lot of specimens, and could be really time consuming. The self-heating method has been developed in order to predict S–N–P curves (i.e., amplitude stress – number of cycles to failure – probability of failure) with only a few specimens. So the time-saving advantage of this method has been demonstrated on several materials, at room temperature. In order to reduce the cost and time of fatigue characterization at high temperature, the self-heating method is adapted to characterize HCF properties of a titanium alloy, the Ti-6Al-4V (TA6V), at different temperatures. So the self-heating procedure is adjusted to conduct tests with a furnace. Two dissipative phenomena can be observed on self-heating curves. Because of this, a two-scale probabilistic model with two dissipative mechanisms is used to describe them. The first one is observed for low amplitudes of cyclic loading, under the fatigue limit, and the second one for higher amplitudes where the mechanisms of fatigue damage are activated and are dissipating more energy. This model was developed on steel at room temperature. Even so, it is used to describe the self-heating curves of the TA6V at several temperatures.

scholarly journals Determination of Thermal Diffusivity and Its Temperature Dependence of Fe1−xO Scale at High Temperature by Electrical-Optical Hybrid Pulse-Heating Method

2021 ◽  
Vol 61 (1) ◽  
pp. 26-32
Author(s):  
Yuanru Yang ◽  
Hiromichi Watanabe ◽  
Megumi Akoshima ◽  
Miyuki Hayashi ◽  
Masahiro Susa ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Diffusivity ◽  
Temperature Dependence ◽  
Pulse Heating ◽  
Heating Method

High Temperature Thermal Conductivity Measurements of Quasicrystalline Al70.8Pd20.9Mn8.3

2000 ◽  
Vol 626 ◽  
Author(s):  
Philip S. Davis ◽  
Peter A. Barnes ◽  
Cronin B. Vining ◽  
Amy L. Pope ◽  
Robert Schneidmiller ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Radiative Heat ◽  
Accurate Determination ◽  
Fourth Power ◽  
Radiative Effects ◽  
Radiative Heat Loss ◽  
3Ω Method ◽  
Temperature Range

ABSTRACTWe report measurements of the thermal conductivity on a potential high temperature thermoelectric material, the quasicrystal Al70.8Pd20.9Mn8.3. Thermal conductivity is determined over a temperature range from 30 K to 600 K, using both the steady state gradient method and the 3ω method. Measurements of high temperature thermal conductivity are extremely difficult using standard heat conduction techniques. These difficulties arise from the fact that heat is lost due to radiative effects. The radiative effects are proportional to the temperature of the sample to the fourth power and therefore can lead to large errors in the measured thermal conductivity of the sample, becoming more serious as the temperature increases. For thermoelectric applications in the high temperature regime, the thermal conductivity is an extremely important parameter to determine. The 3ω technique minimizes radiative heat loss terms, which will allow for more accurate determination of the thermal conductivity of Al70.8Pd20.9Mn8.3 at high temperatures. The results obtained using the 3ω method are compared to results from a standard bulk-thermal-conductivity-technique on the same samples over the temperature range, 30 K to 300 K.

scholarly journals Determination of composition based on thermal conductivity by thermistor direct heating method

2020 ◽  
Vol 1 (5 (103)) ◽  
pp. 19-29
Author(s):  
Sergey Matvienko ◽  
Vadim Shevchenko ◽  
Mykola Tereshchenko ◽  
Anatolii Kravchenko ◽  
Ruslan Ivanenko
Keyword(s):  
Thermal Conductivity ◽  
Heating Method ◽  
Direct Heating
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