Inverse method using infrared thermography for surface temperature and heat flux measurements

Reulet, Philippe; Nörtershäuser, D.; Millan, Pierre

doi:10.1109/iciasf.2003.1274861

Cited by 8 publications

(6 citation statements)

References 1 publication

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“…2. The heat flux q c (y, z, t) on the front face is calculated from the rear face temperature measurement T rear w (y, z, t) by means of resolution of an inverse heat conduction problem (IHCP), introduced by Reulet et al (2003). The plate lateral sides are assumed adiabatic.…”

Section: Resultsmentioning

confidence: 99%

“…The use of a cold wire thermometer (CWT) gave access to both the mean and fluctuating temperature fields along with temperature spectra. Finally, both the heat transfer and the adiabatic wall temperature distribution on the impinged plate were obtained by means of the inverse method (ThEFA) proposed by Reulet et al (2003), which is based on infrared thermography measurements of the rear face of the plate. Contrary to the thin foil technique, this method offers the advantage that the plate does not have to be supplied by a constant heat flux but is simply introduced in the hot flow.…”

Section: Scope Of the Present Workmentioning

confidence: 99%

“…3d shows the experimental arrangement associated with the heat transfer coefficient measurement. The local convective heat flux coefficient and the adiabatic temperature on the impinged plate are obtained from the local transient evolution of the rear surface temperature when the plate is suddenly introduced in the hot jet flow, following the ThEFA (French acronym for rear face thermography) method introduced by Reulet et al (2003) and presented in AppendixA.…”

Section: Cold Wire Thermometry (Cwt)mentioning

confidence: 99%

See 2 more Smart Citations

Investigation of an impinging heated jet for a small nozzle-to-plate distance and high Reynolds number: An extensive experimental approach

Grenson¹,

Léon²,

Reulet³

et al. 2016

International Journal of Heat and Mass Transfer

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The present work aims at investigating a particular impinging jet configuration throughout a comprehensive experimental approach. A preheated air jet at 130 • C issues a fully developed circular pipe at Reynolds number 60,000 and discharges in the laboratory room to impinge a flat plate located 3 diameters downstream. The description of the velocity field and the complete Reynolds stress tensor is provided by stereoscopic particle image velocimetry (S-PIV) and laser Doppler velocimetry (LDV) measurements. For the first time, data are reported for the mean and fluctuating temperature of an impinging jet configuration with the help of cold-wire thermometry (CWT) measurements. The heat transfer distribution on the impinged plate is determined through an inverse method based on infrared thermography measurements on the rear face of the plate. The agreement between SPIV and LDV measurements is shown excellent over the whole flow field. The measured Nusselt number distribution exhibits a secondary maximum at r/D = 2, as observed in previous experiments for short impinging distances. Flow dynamics is characterized through a spectral analysis of time-resolved measurements while flow topology features are identified through coherent structure detection based on SPIV spatiallyresolved instantaneous velocity fields. This analysis shows that the jet column mode, associated with a Strouhal number of 0.4, plays a key role in the primary structure dynamics.

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Section: Resultsmentioning

confidence: 99%

Section: Scope Of the Present Workmentioning

confidence: 99%

Section: Cold Wire Thermometry (Cwt)mentioning

confidence: 99%

See 1 more Smart Citation

Investigation of an impinging heated jet for a small nozzle-to-plate distance and high Reynolds number: An extensive experimental approach

Grenson¹,

Léon²,

Reulet³

et al. 2016

International Journal of Heat and Mass Transfer

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“…That is, by using the characteristic function XD of D, 7(x) is given as 7(1) = 1 + (A: -1)XD-Here Ü could be a cross section of a heat conductive bar which contains an unknown inclusion with a uniform cross section D. We are concerned with a thermographie nondestructive testing to identify D. This testing is to identify D from the measurements which apply heat flux (sometime called thermal load) to dil many times and measure the corresponding temperature on dU. For more details, the readers can refer to [15], [16] and the references therein. In this paper, we will provide both theoretical and numerical schemes for this testing.…”

Section: Introductionmentioning

confidence: 99%

Numerical Implementation for a 2-D Thermal Inhomogeneity Through the Dynamical Probe Method

Yi¹

2010

JCM

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In this paper, we present the theory and numerical implementation for a 2-D thermal inhomogeneity through the dynamical probe method. The main idea of the dynamical probe method is to construct an indicator function associated with some probe snch that when the probe touch the boundary of the inclusion the indicator function will blow up. FVom this property, we can get the shape of the inclusion. We will give the numerical reconstruction algorithm to identify the inclusion from the simulated Neumann-to-Dirichlet map.Mathematics subject classification: 35R30.

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“…Active thermography is a widely used non-destructive testing technique in industrial engineering, which aims to detect the internal information of a heat conductor [7,21,36,37]. The principle of active thermography is as follows.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of an unknown cavity with Robin boundary condition inside a heat conductor

Nakamura

Wang

2015

Inverse Problems

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Active thermography is a non-destructive testing technique to detect the internal structure of a heat conductor, which is widely applied in industrial engineering. In this paper, we consider the problem of identifying an unknown cavity with Robin boundary condition inside a heat conductor from boundary measurements. To set up the inverse problem mathematically, we first state the corresponding forward problem and show its well-posedness in an anisotropic Sobolev space by the integral equation method. Then, taking the Neumann-to-Dirichlet map as mathematically idealized measured data for the active thermography, we present a linear sampling method for reconstructing the unknown Robin-type cavity and give its mathematical justification by using the layer potential argument. In addition, we analyze the indicator function used in this method and show its pointwise asymptotic behavior by investigating the reflected solution of the fundamental solution. From our asymptotic analysis, we can establish a pointwise reconstruction scheme for the boundary of the cavity, and can also know the distance to the unknown cavity as we probe it from its inside.

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Inverse method using infrared thermography for surface temperature and heat flux measurements

Cited by 8 publications

References 1 publication

Investigation of an impinging heated jet for a small nozzle-to-plate distance and high Reynolds number: An extensive experimental approach

Investigation of an impinging heated jet for a small nozzle-to-plate distance and high Reynolds number: An extensive experimental approach

Numerical Implementation for a 2-D Thermal Inhomogeneity Through the Dynamical Probe Method

Reconstruction of an unknown cavity with Robin boundary condition inside a heat conductor

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