Experimental thermal time estimation for Mach‐Zehnder interferometer to study coupled heat and mass transfer

Ahadi, Amirhossein; Khoshnevis, Ahmad; Saghir, M. Ziad

doi:10.1002/cjce.22376

Cited by 3 publications

(6 citation statements)

References 47 publications

(89 reference statements)

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“…The changes in the refractive index of the mixture are caused by changes in the temperature and concentration:

Δ n true(x, z true) = true(\frac{\partial n}{\partial T} true) Δ T true(x, z true) + true(\frac{\partial n}{\partial C} true) Δ C true(x, z true)

where

true(\frac{\partial n}{\partial T} true)

and

true(\frac{\partial n}{\partial C} true)

are changes of refractive index, values for which are available in the literature . The time it took to reach a steady temperature distribution after applying the temperature difference was known as the characteristic thermal time.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…During this time, the variation of the refractive index was due to the temperature variation only, because the effect of the concentration variation was negligible. Therefore, Equation during the thermal time can be simplified:

Δ n true(x, z true) = true(\frac{\partial n}{\partial T} true) Δ T true(x, z true)

…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…In this situation, the concentration gradient can be written as follows:

\nabla C = - \frac{D_{T}}{D_{M}} C_{0} true(1 - C_{0} true) \nabla T

where

\frac{D_{T}}{D_{M}}

is the Soret coefficient, S T . The concentration difference between the top and bottom walls induced by Soret effect can be measured from the refractive index:

Δ C true(z, t true) = C {true(z, t true)}_{z = L (t o p)} - C {true(z, t true)}_{z = 0 (b o t t o m)}

…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…The changes in the refractive index of the mixture are caused by changes in the temperature and concentration: [33]…”

Section: Theoretical Approach To Soret Coefficient Extraction From Exmentioning

confidence: 99%

“…From Equation (2), the temperature profile was obtained. After the thermal time, the variation of the refractive index was due to the concentration variation: [33]…”

Section: Theoretical Approach To Soret Coefficient Extraction From Exmentioning

confidence: 99%

See 4 more Smart Citations

Effect of gravity orientation in the study of thermodiffusion

2016

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This paper describes the measurement of the Soret coefficient of a hydrocarbon binary liquid mixture at different orientations to the gravity vector. The working fluid in the experiment was composed of 1,2,3,4‐tetrahydronaphtalene (THN) and dodecane (C12) at mass fractions of 0.50/0.50 and a temperature of 298.15 K. The experimental technique used in this study was an optical digital interferometry method using a Mach‐Zehnder Interferometer. A fast Fourier transform method was used for image processing. The experimental approach was supplemented with a numerical solution using the finite volume method. Experimental and numerical results both confirmed that cell inclination during the thermodiffusion process had a tremendous effect on the measurement of the Soret coefficient.

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“…The changes in the refractive index of the mixture are caused by changes in the temperature and concentration:

Δ n true(x, z true) = true(\frac{\partial n}{\partial T} true) Δ T true(x, z true) + true(\frac{\partial n}{\partial C} true) Δ C true(x, z true)

where

true(\frac{\partial n}{\partial T} true)

and

true(\frac{\partial n}{\partial C} true)

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Δ n true(x, z true) = true(\frac{\partial n}{\partial T} true) Δ T true(x, z true)

…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…In this situation, the concentration gradient can be written as follows:

\nabla C = - \frac{D_{T}}{D_{M}} C_{0} true(1 - C_{0} true) \nabla T

where

\frac{D_{T}}{D_{M}}

is the Soret coefficient, S T . The concentration difference between the top and bottom walls induced by Soret effect can be measured from the refractive index:

Δ C true(z, t true) = C {true(z, t true)}_{z = L (t o p)} - C {true(z, t true)}_{z = 0 (b o t t o m)}

…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…The changes in the refractive index of the mixture are caused by changes in the temperature and concentration: [33]…”

Section: Theoretical Approach To Soret Coefficient Extraction From Exmentioning

confidence: 99%

“…From Equation (2), the temperature profile was obtained. After the thermal time, the variation of the refractive index was due to the concentration variation: [33]…”

Section: Theoretical Approach To Soret Coefficient Extraction From Exmentioning

confidence: 99%

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Effect of gravity orientation in the study of thermodiffusion

2016

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Interferometric Probing of Physical and Chemical Properties of Solutions: Noncontact Investigation of Liquids

Eder

Briesen

2022

Annu. Rev. Chem. Biomol. Eng.

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Interferometry is a highly versatile tool for probing physical and chemical phenomena. In addition to the benefit of noncontact investigations, even spatially resolved information can be obtained by choosing a suitable setup. This review presents the evolution of the various setups that have evolved since the first interferometers were developed in the mid-nineteenth century and highlights the benefits, limitations, and typical areas of application. This review focuses on interferometry based on electromagnetic waves in the near-infrared and visible range applied to liquid samples, categorizes the chemical/physical properties (e.g., pressure, temperature, composition) and phenomena (e.g., evaporation, crystal growth, diffusion, thermophoresis) that can be assessed, and presents a comprehensive literature review of specific existing applications. Finally, it discusses some fundamental open questions with respect to geometric considerations and overlapping effects. Expected final online publication date for the Annual Review of Chemical and Biomolecular Engineering, Volume 13 is October 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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