scholarly journals Open photoacoustic cell for thermal diffusivity measurements of a fast hardening cement used in dental restoring

2012 ◽  
Vol 111 (1) ◽  
pp. 014701 ◽  
Author(s):  
F. B. G. Astrath ◽  
N. G. C. Astrath ◽  
M. L. Baesso ◽  
A. C. Bento ◽  
J. C. S. Moraes ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
Photoacoustic Cell ◽  
Open Photoacoustic Cell ◽  
Diffusivity Measurements

Human nail thermal diffusivity obtained using the open photoacoustic cell technique

2005 ◽  
Vol 125 ◽  
pp. 657-660 ◽  
Author(s):  
D. T. Dias ◽  
L. E.R. Nuglish ◽  
E. Sehn ◽  
M. L. Baesso ◽  
A. N. Medina ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
Photoacoustic Cell ◽  
Open Photoacoustic Cell ◽  
Human Nail

scholarly journals Improvement of the photoacoustic response in thermal diffusivity measurements

2020 ◽  
Vol 3 (4) ◽  
pp. 196-205
Author(s):  
David Gasca-Figueroa ◽  
Micael Gerardo Bravo-Sánchez ◽  
Adriana Guzmán-López ◽  
José Guadalupe Zavala-Villalpando ◽  
Francisco Javier García-Rodríguez
Keyword(s):  
Mathematical Model ◽  
Thermal Properties ◽  
Thermal Diffusivity ◽  
Room Temperature ◽  
Heat Energy ◽  
Photoacoustic Cell ◽  
Solid Materials ◽  
Diffusivity Measurements ◽  
Materials Used

An alternative photoacoustic cell configuration for the determination of the thermal diffusivity (α), at room temperature, for solid materials is presented. The method is based on the use of two identical photoacoustic chambers, inside both of them, a metallic foil thermally thin is used to transform the light energy to heat energy.  A Reference material placed parallel to a study material allows to relate the thermal properties of the materials used as support in the photoacoustic chambers of the experimental arrangement presented here. The ratio between experimental and theoretical photoacoustic amplitudes is realized to validate a proposed mathematical model.

Thermal Properties Measurement Photoacoustic Technique for Hardmetals

2006 ◽  
Vol 530-531 ◽  
pp. 41-47 ◽  
Author(s):  
F.A.L. Machado ◽  
Roberto da Trindade Faria Jr. ◽  
Marcello Filgueira ◽  
M.F. Rodrigues ◽  
Guerold Sergueevitch Bobrovinitchii ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Cutting Tool ◽  
Thermal Capacity ◽  
Liquid Phase Sintering ◽  
Point Of View ◽  
Photoacoustic Technique ◽  
Photoacoustic Cell ◽  
Open Photoacoustic Cell ◽  
High Pressure High Temperature

The open photoacoustic cell technique (OPC) was carried out in order to measure the thermal diffusivity of hardmetal. Hardmetal is usually processed by the conventional powder technology techniques: mix of WC + Co powders, compacting, and liquid phase sintering A new method to process hardmetal parts is hereby described. Parts of WC-15%wt Co were processed by using high pressure – high temperature sintering. It was used the pressure of 5GPa, temperature of 1350 oC, and time of 2 minutes of sintering. In addition to the thermal diffusivity, heat capacity was considered and the thermal conductivity achieved. Results matched with the values of the literatures where others photoacoustic techniques have been employed. It was achieved a thermal capacity of 3.34J/cm3K, thermal diffusivity of 0.35cm2/s, and thermal conductivity of 116.9W/mK. It reveals that the HPHT processed WC- 15%wtCo hardmetal is able to work as a cutting tool, in the thermal point of view.

Characterization of Heat Diffusion Properties of Rubberized Two-Layer Systems Using Open Photoacoustic Cell Spectroscopy

2017 ◽  
Vol 72 (2) ◽  
pp. 251-256 ◽  
Author(s):  
Thiago V. Moreno ◽  
Nilson E. Souza Filho ◽  
Andressa Novatski ◽  
Luis C. Malacarne ◽  
Gustavo S. Dias ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
Thermal Resistance ◽  
Aluminum Foil ◽  
Heat Diffusion ◽  
Photoacoustic Cell ◽  
Effective Thermal Diffusivity ◽  
Open Photoacoustic Cell ◽  
Precise Tool ◽  
Transfer Problems

We applied the open photoacoustic cell method operating at high frequency as an efficient and highly precise tool for the measurement of thermal properties of rubberized two-layer systems. The heat-coupling between the two layers is treated using the analogy between thermal and electrical resistances widely used in heat transfer problems. The thermal resistance between the two layers is considered effective and the problem is decoupled for each layer. Measurements are performed in two-layer samples of aluminum foil coated with layers of rubberized paint with different thicknesses. Thermal diffusivity and thermal conductivity are determined for the paint. The results are retrieved from the thermal resistance model assuming the effective thermal diffusivity of the composite material.

Open Photoacoustic Cell study of thermal diffusivity of Nafion® as a function of water content

2005 ◽  
Vol 125 ◽  
pp. 383-386 ◽  
Author(s):  
D. T. Dias ◽  
J. Mura ◽  
M. L. Baesso ◽  
A. N. Medina ◽  
A. C. Bento ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
Water Content ◽  
Photoacoustic Cell ◽  
Open Photoacoustic Cell ◽  
Cell Study

Thermal diffusivity of periderm from tomatoes of different maturity stages as determined by the concept of the frequency-domain open photoacoustic cell

2011 ◽  
Vol 109 (3) ◽  
pp. 034703 ◽  
Author(s):  
Daniel Soares Velasco ◽  
Mauro Luciano Baesso ◽  
Antonio Neto Medina ◽  
Dane Danijel Bicanic ◽  
Rob Koehorst ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
Frequency Domain ◽  
Photoacoustic Cell ◽  
Open Photoacoustic Cell ◽  
Maturity Stages
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