Investigation of the accuracy of different methods of interferogram analysis for calculation of local free convection heat transfer coefficient on axisymmetric objects

Goharkhah, Mohammad; Ashjaee, Mehdi; Madanipour, Khosro

doi:10.1016/j.expthermflusci.2009.08.004

Cited by 10 publications

(4 citation statements)

References 17 publications

(21 reference statements)

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“…It should be noted that a parallel wedge fringe pattern was used as the initial setting, unlike fringe settings normal to the heated surface, commonly used in temperature measurements. [38] This introduces substantial advantage in making measurements in the confined space within the compact channel, as only the fringe spacing gets significantly affected, and the orientation remains almost parallel even after heating, as the field is almost axially isothermal. The application of wedge fringe patterns parallel to the heated surface is not found in previous literatures.…”

Section: Benchmarking Experimentsmentioning

confidence: 99%

Digital Interferometric Measurement of Forced Convection Fields in Compact Channels

Haridas

Reddy

Sobhan

2014

International Journal of Optomechatronics

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The application of digital interferometric techniques in the measurement of forced convection in compact channels is examined. Michelson Interferometry and Mach-Zehnder Interferometry have been compared and contrasted, in terms of the suitability for temperature measurements. A wedge-fringe setting parallel to the heated surface has been utilized as the basis of the fringe analysis, for effective measurement in small dimension channels. Michelson interferometry was found to provide a larger number of data points in the visualization field, thus proving to be a better method of measurement in compact passages. Heat transfer parameters, useful in heat sink design, were also calculated.

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Section: Benchmarking Experimentsmentioning

confidence: 99%

Digital Interferometric Measurement of Forced Convection Fields in Compact Channels

Haridas

Reddy

Sobhan

2014

International Journal of Optomechatronics

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“…The experimental part of this work consists of the use of the holographic interferometry to map the convective field inside a horizontal open‐ended axisymmetric cavity. This technique offers an overall quantitative image of the buoyancy‐driven convection in the fluid visualized through interference fringes . The axisymmetric propriety of the flow makes it possible to reconstruct the 3D temperature field with only one projection due to the Abel inversion transform.…”

Section: Introductionmentioning

confidence: 99%

“…This technique offers an overall quantitative image of the buoyancy-driven convection in the fluid visualized through interference fringes. 13,14 The axisymmetric propriety of the flow makes it possible to reconstruct the 3D temperature field with only one projection due to the Abel inversion transform. In order to achieve a satisfactory accuracy, the technique of wavelet transforms and the Fourier-Hankel method are implemented for the phase extraction and the Abel inversion, respectively.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of free convection through a horizontal open‐ended axisymmetric cavity

Said

Chehouani

Er‐Raki

2017

Heat Trans. Asian Res.

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This paper summarizes a numerical and experimental investigation of free convective heat transfer in an open‐ended cavity between two horizontal parallel circular plates. The upper plate is maintained at an ambient temperature and the lower one is heated. Air is used as the heat transfer medium. The numerical model equations are solved using a control volume‐based finite differences method, and the experimental study was performed using holographic interferometry. Streamlines and isotherm patterns are presented and discussed for different aspect ratios (A) and Rayleigh numbers (Ra). Heat transfer at the surface of the lower plate is thoroughly inspected in the ranges 0.1≤A≤1 and 102≤Ra≤5×106. Useful correlations of Nusselt numbers in terms of Ra and A are given with their validity ranges. Also, an investigation of both numerical and experimental results is performed. It shows similar temperature field aspect with some differences in the radial boundary layer thickness and a small deviation in the heat transfer.

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“…In a group of optical methods which are called index of refraction methods, the temperature distribution is obtained by measuring the phase differences of light rays caused by variations in refractive index. In several relatively recent publications, such methods include classical interferometry [3] and holographic interferometry [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Real Time Temperature Distribution Measurement of a Microheater by Using Off-Axis Digital Holography

Tserendolgor

Baek²,

Kim³

2011

Journal of the Korean Vacuum Society

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We describe a single shot off-axis digital holography based on a Mach-Zehnder interferometic scheme for measuring temperature distribution of a microheater. The proposed scheme has the capability of reconstructing object phase image which is dependent of the temperature distribution in real time. Experimental results shows that there is a moderate linear relationship between the measured phase and temperature in the range of 20 o C to 60 o C. We expect that the proposed system can provide a very reliable and fast solution in various surface temperature distribution measurement applications.

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Investigation of the accuracy of different methods of interferogram analysis for calculation of local free convection heat transfer coefficient on axisymmetric objects

Cited by 10 publications

References 17 publications

Digital Interferometric Measurement of Forced Convection Fields in Compact Channels

Digital Interferometric Measurement of Forced Convection Fields in Compact Channels

Numerical and experimental study of free convection through a horizontal open‐ended axisymmetric cavity

Real Time Temperature Distribution Measurement of a Microheater by Using Off-Axis Digital Holography

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