Measuring the Thermal Conductivity of Flowing Liquid Samples Using the Three Omega Method

2012 ◽  
Vol 134 (9) ◽  
Author(s):  
Jonggan Hong ◽  
Dongsik Kim
Keyword(s):  
Thermal Conductivity ◽  
Boundary Layer ◽  
Circular Tube ◽  
Dimensionless Number ◽  
Flowing Liquid ◽  
Omega Method ◽  
Wave Technique ◽  
Momentum Boundary Layer ◽  
Three Omega Method

The thermal conductivity of a liquid is generally measured under conditions that suppress bulk flow in the sample. However, in situ measurement of the thermal conductivity of a flowing liquid would be useful in various scientific and engineering applications. This work demonstrates that a thermal wave technique, such as the three omega method, can effectively measure the thermal conductivity of flowing liquid if the frequency range is adjusted such that the thermal boundary layer is sufficiently thinner than the momentum boundary layer. A new dimensionless number was defined to assess the convection effects, and a criterion for thermal conductivity measurements was obtained for water flowing in a circular tube.

End Effects in the Three-Omega Method to Measure Gas Thermal Conductivity

2009 ◽  
Vol 30 (3) ◽  
pp. 833-850 ◽  
Author(s):  
E. Yusibani ◽  
P. L. Woodfield ◽  
M. Kohno ◽  
K. Shinzato ◽  
Y. Takata ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
End Effects ◽  
Omega Method ◽  
Three Omega Method

scholarly journals Thermal Conductivity of Nano-Crystallized Indium-Gallium-Zinc Oxide Thin Films Determined by Differential Three-Omega Method

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1547
Author(s):  
Rauf Khan ◽  
Michitaka Ohtaki ◽  
Satoshi Hata ◽  
Koji Miyazaki ◽  
Reiji Hattori
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Zinc Oxide ◽  
Indium Gallium Zinc Oxide ◽  
Crystalline Materials ◽  
Omega Method ◽  
Indium Gallium ◽  
Α Al2o3 ◽  
Three Omega Method ◽  
Thermal Conductivities

The temperature dependence thermal conductivity of the indium-gallium-zinc oxide (IGZO) thin films was investigated with the differential three-omega method for the clear demonstration of nanocrystallinity. The thin films were deposited on an alumina (α-Al2O3) substrate by direct current (DC) magnetron sputtering at different oxygen partial pressures ([PO2] = 0%, 10%, and 65%). Their thermal conductivities at room temperature were measured to be 1.65, 1.76, and 2.58 Wm−1K−1, respectively. The thermal conductivities decreased with an increase in the ambient measurement temperature. This thermal property is similar to that of crystalline materials. Electron microscopy observations revealed the presence of nanocrystals embedded in the amorphous matrix of the IGZO films. The typical size of the nanocrystals was approximately 2–5 nm with the lattice distance of about 0.24–0.26 nm. These experimental results indicate that the nanocrystalline microstructure controls the heat conduction in the IGZO films.

Measurement of the Thermal Conductivity of Polydimethylsiloxane Polymer Using the Three Omega Method

2014 ◽  
Vol 613 ◽  
pp. 259-266 ◽  
Author(s):  
Nadine Al-Khudary ◽  
Pierre Yves Cresson ◽  
Yovan Orlic ◽  
Philippe Coquet ◽  
Philippe Pernod ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Finite Element Method ◽  
Finite Element ◽  
Thermal Properties ◽  
Approximate Solution ◽  
Ease Of Use ◽  
Medical Applications ◽  
Omega Method ◽  
Different Temperatures ◽  
Three Omega Method

Polydimethylsiloxane (PDMS) has widely appeared in different electronic and medical applications. The knowledge of the thermal properties of PDMS and especially its thermal conductivity is required while processing PDMS to design a particular device. In this paper measurement of the thermal conductivity of PDMS using the three omega method is presented at different temperatures. The three omega method has been chosen because of its ease of use and accuracy. It requires the fabrication of metallic lines which act as heaters and thermometers on the surface of the material under test. A different procedure is introduced in this paper through which the metallic lines are embedded in the surface of PDMS. Experimental results are then compared to Cahill's approximate solution and to the results obtained by numerical simulations using a finite element method.

scholarly journals A Procedure for Application of the Three-Omega Method to Measurement of Gas Thermal Conductivity

2009 ◽  
Vol 4 (1) ◽  
pp. 146-158 ◽  
Author(s):  
Elin YUSIBANI ◽  
Peter Lloyd WOODFIELD ◽  
Shogo MOROE ◽  
Kanei SHINZATO ◽  
Masamichi KOHNO ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Omega Method ◽  
Three Omega Method

Application of the Three-Omega Method to Measurement of Thermal Conductivity and Thermal Diffusivity of Hydrogen Gas

2009 ◽  
Vol 30 (2) ◽  
pp. 397-415 ◽  
Author(s):  
E. Yusibani ◽  
P. L. Woodfield ◽  
M. Fujii ◽  
K. Shinzato ◽  
X. Zhang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Hydrogen Gas ◽  
Omega Method ◽  
Three Omega Method
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