On the criterion for neglecting corrective effects in photoacoustic experiments

O. Delgado-Vasallo; E. Marín

doi:10.1051/jp4:2005125038

On the criterion for neglecting corrective effects in photoacoustic experiments

O. Delgado-Vasallo, E. Marín

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

Abstract

The first step in the theoretical modeling of photoacoustic experiments is the calculation of the Temperature within the sample and/or its environment. For solids it is usually calculated by solving the heat diffusion equation. The same equation is used often for liquid samples, as well as for the gas filling the PA chamber, neglecting the role played by hydrodynamic effects. In the present work we will briefly describe how the Theory of Similarity shows that the heat diffusion equation, in its usual formulation, can be only applied for fluids when the product of Grashof (Gr) and Prandtl (Pr) numbers, the so-called Rayleigh, Ra, number, is lower than 1000.

Original language	English
Pages (from-to)	165-167
Number of pages	3
Journal	Journal De Physique. IV : JP
Volume	125
DOIs	https://doi.org/10.1051/jp4:2005125038
State	Published - 2005
Externally published	Yes
Event	13th ICPPP International Conference on Photoacoustic and PhotothermalPhenomena - Rio de Janeiro, Brazil Duration: 5 Jul 2004 → 8 Jul 2004

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abstract = "The first step in the theoretical modeling of photoacoustic experiments is the calculation of the Temperature within the sample and/or its environment. For solids it is usually calculated by solving the heat diffusion equation. The same equation is used often for liquid samples, as well as for the gas filling the PA chamber, neglecting the role played by hydrodynamic effects. In the present work we will briefly describe how the Theory of Similarity shows that the heat diffusion equation, in its usual formulation, can be only applied for fluids when the product of Grashof (Gr) and Prandtl (Pr) numbers, the so-called Rayleigh, Ra, number, is lower than 1000.",

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AU - Delgado-Vasallo, O.

AU - Marín, E.

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AB - The first step in the theoretical modeling of photoacoustic experiments is the calculation of the Temperature within the sample and/or its environment. For solids it is usually calculated by solving the heat diffusion equation. The same equation is used often for liquid samples, as well as for the gas filling the PA chamber, neglecting the role played by hydrodynamic effects. In the present work we will briefly describe how the Theory of Similarity shows that the heat diffusion equation, in its usual formulation, can be only applied for fluids when the product of Grashof (Gr) and Prandtl (Pr) numbers, the so-called Rayleigh, Ra, number, is lower than 1000.

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JO - Journal De Physique. IV : JP

JF - Journal De Physique. IV : JP

T2 - 13th ICPPP International Conference on Photoacoustic and PhotothermalPhenomena

Y2 - 5 July 2004 through 8 July 2004

ER -

On the criterion for neglecting corrective effects in photoacoustic experiments

Abstract

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