Interferometric study of natural convection heat transfer phenomena around array of heated cylinders

Narayan, Surya; Singh, Abhimanyu Kumar; Srivastava, Atul

doi:10.1016/j.ijheatmasstransfer.2017.01.106

Cited by 44 publications

(8 citation statements)

References 42 publications

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“…The uncertainty of interference phase measurement comes from factors such as misalignment and settling of optical components , fluctuation of laser wavelength , electronic noise, and external unstable environment conditions [15]. The phase noise for our measurement is estimated to be 0.05 rad.…”

Section: Limits and Errors Of Interferometry In Liquidsmentioning

confidence: 96%

“…The interference phase is coded in a cosine modulated fringe pattern. The accuracy with which the quantity of interest can be determined, depends on the phase retrieval method [15]. By applying the Fourier Transform and making use of its properties, the equation now is:…”

Section: Off-axis Digital Holographic Interferometrymentioning

confidence: 99%

“…There is a vast field of applications of DHI and other interference based methods including: entertainment display [8], imaging heat transfer and mass transfer [7,[9][10][11][12][13], research in free convection [14,15], visualization of the 3D velocity vector field in turbulent boundary layer [6], analysis of supersonic jets [6], biological (living cell imaging) [6,16], environmental applications [6,17], precision measurements [8,18,19], small displacements [20], thermomechanical analysis and non-destructive testing [6], microscopy and high-resolution volume imagery [21,22], vibrometry [23,24], topography [25,26], process monitoring [7], computerized tomography [7,27], and so on. This paper aims at investigating heat transfer problems.…”

Section: Introductionmentioning

confidence: 99%

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Digital Holographic Interferometry for the Measurement of Symmetrical Temperature Fields in Liquids

et al. 2021

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In this paper, we present a method of quantitatively measuring in real-time the dynamic temperature field change and visualization of volumetric temperature fields generated by a 2D axial-symmetric heated fluid from a pulsatile jet in a water tank through off-axis digital holographic interferometry. A Mach-Zehnder interferometer on portable platform was built for the experimental investigation. The pulsatile jet was submerged in a water tank and fed with water with higher temperature. Tomographic approach was used to reconstruct the temperature fields through the Abel Transform and the filtered back-projection. Averaged results, tomographic view, standard deviation and errors are presented. The presented results reveal digital holographic interferometry as a powerful technique to visualize temperature fields in flowing liquids and gases.

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Section: Limits and Errors Of Interferometry In Liquidsmentioning

confidence: 96%

Section: Off-axis Digital Holographic Interferometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Digital Holographic Interferometry for the Measurement of Symmetrical Temperature Fields in Liquids

et al. 2021

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“…Due to the presence of density gradients, compressible fluid flow is very suitable for an investigation using optical methods that are sensitive either to the refractive index of the medium through which the light wave propagates (interferometry), or to a refractive index gradient in the medium (schlieren [7][8][9][10][11], shadowgraph [12][13][14][15][16], Moiré deflectometry [17][18][19][20][21]). Interferometric methods such as classical interferometry [22,23], holographic interferometry [24] and digital holographic interferometry [25][26][27][28][29] stand as the most accurate optical techniques [26,30,31] that are applied in many sectors of industry and scientific research, notably in the study of liquid cooling [32], diffusion [33], convection [34,35], temperature measurements and visualization [1,25,36], temperature fields measurement in pulsatile jets [25], studies of living cell imaging [37,38], precision measurement [15,39,40], vibrometry [41,42] etc. However, the field of the transonic or even supersonic flow generated in wind tunnel facilities is very specific, and the current state of th...…”

Section: Introductionmentioning

confidence: 99%

Characterization of Supersonic Compressible Fluid Flow Using High-Speed Interferometry

Psota

Çubreli

Hála

et al. 2021

Sensors

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This paper presents a very effective interference technique for the sensing and researching of compressible fluid flow in a wind tunnel facility. The developed technique is very sensitive and accurate, yet easy to use under conditions typical for aerodynamic labs, and will be used for the nonintrusive investigation of flutter in blade cascades. The interferometer employs a high-speed camera, fiber optics, and available “of-the-shelf” optics and optomechanics. The construction of the interferometer together with the fiber optics ensures the high compactness and portability of the system. Moreover, single-shot quantitative data processing based on introducing a spatial carrier frequency and Fourier analysis allows for almost real-time quantitative processing. As a validation case, the interferometric system was successfully applied in the research of supersonic compressible fluid discharge from a narrow channel in a wind tunnel. Density distributions were quantitatively analyzed with the spatial resolution of about 50 μm. The results of the measurement revealed important features of the flow pattern. Moreover, the measurement results were compared with Computational Fluid Dynamics (CFD) simulations with a good agreement.

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“…16 The phenomenon of natural convection in magnetohydrodynamics with Prandtl number effect inside a square box with thermal insulation was numerically studied by Hussein et al 17 He analyzed and explained the influence of various Hartmann numbers, Ra and Prandtl numbers on the flow field and thermal field. Narayan et al 18 applied Mach-Zehnder interferometry (MZI) to investigate one cylinder, two cylinders (two cylinders placed adjacent to each other with varying center-to-center distances), three cylinders (three cylinders arranged in a triangular configuration). For the two cylinders, the net convective phenomena showed a strong dependence on their relative spacing.…”

mentioning

confidence: 99%

Natural convection heat transfer from two horizontal cylinders using a large lateral shearing interferometer

Zhu

Wang

et al. 2020

Heat Trans

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Natural convection heat transfer from two horizontal cylinders in the air was investigated experimentally and numerically. Two cylinders were spaced at 1.3, 1.8, and 2.7 cylinder diameters horizontally. The experiments were carried out by large lateral shear interferometry (LSI) for various Rayleigh numbers in the range of 103 to 104. Large LSI is common path interferometry with the advantages of simple structure, strong antivibration, and fewer required optical components. It is not necessary for LSI to perform a complex algorithm to restore wavefront with a large shear amount. Simple and infinite fringe interferograms of the cylinders heated from ambient temperature 282.15 to 723.15 K were obtained. A numerical simulation was carried out with ANSYS‐Fluent 18.0. The influence of two factors, the distance between the cylinders, and the Rayleigh number, on the heat transfer of two horizontal cylinders was examined. The average Nusselt number and local Nusselt number were determined from the experimental results and numerical results, respectively, and the two results were in good agreement. The rising direction for the plume flow pattern of each horizontal cylinder was no longer simply vertically upward but was inclined toward the central symmetry axis of the two cylinders. In addition, the heat transfer from a cylinder increased with the cylinder spacing at any Rayleigh number.

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Interferometric study of natural convection heat transfer phenomena around array of heated cylinders

Cited by 44 publications

References 42 publications

Digital Holographic Interferometry for the Measurement of Symmetrical Temperature Fields in Liquids

Digital Holographic Interferometry for the Measurement of Symmetrical Temperature Fields in Liquids

Characterization of Supersonic Compressible Fluid Flow Using High-Speed Interferometry

Natural convection heat transfer from two horizontal cylinders using a large lateral shearing interferometer

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