Nondestructive technique of measuring heat conductivity of thermal barrier coatings

Adamczyk, Wojciech; Kruczek, T.; Białecki, Ryszard A.

doi:10.1016/j.ijheatmasstransfer.2017.03.126

Cited by 23 publications

(5 citation statements)

References 23 publications

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“…Therefore, increasing emphasis is placed on the efficient use of available energy and the optimization of production processes in terms of energy consumed [38,39]. The time taken to heat the charge in a walking beam furnace is a major factor in the increasing production costs in hot strip mills [40]. This problem is due to inadequate use of the furnace capacity [41,42].…”

Section: Review Of Current Researchmentioning

confidence: 99%

Modeling of Energy Consumption and Reduction of Pollutant Emissions in a Walking Beam Furnace Using the Expert Method—Case Study

Niekurzak

Mikulik

2021

Energies

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This paper presents an algorithm for modeling electricity and natural gas consumption in a walking furnace with the use of artificial intelligence and simulation methods, depending on the length of the rolling campaign and the established rolling program. This algorithm is the basis for the development of a proposal for a set of minimum requirements characterizing the Best Available Techniques (BAT) for beam furnaces intended for hot rolling, taking into account the requirements set out in national regulations and the recommendations described in the BREF reference documents. This information should be taken into account when drawing up an application for an integrated permit, as well as when setting emission limit values. Based on the constructed algorithm, it was shown that depending on their type and technical specification, the analyzed projects will offer measurable economic benefits in the form of reducing the amount of energy consumed by 1,076,400 kWh during the implementation of 50 rolling campaigns to reduce gas by 14,625 GJ and environmental benefits in the form of reduction of pollutant emissions into the atmosphere 80–360 g/Mg. The constructed algorithm was validated in the Dosimis-3 program, based on a discrete event-driven simulation. Thanks to this representation of the model, its user can interactively participate in changes that take place in the model and thus evaluate its behavior. The model, verified in real conditions, can be the basic source of information for making effective operational technological decisions related to the preparation of production at the rolling mill as part of planning and long-term activities.

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Section: Review Of Current Researchmentioning

confidence: 99%

Modeling of Energy Consumption and Reduction of Pollutant Emissions in a Walking Beam Furnace Using the Expert Method—Case Study

Niekurzak

Mikulik

2021

Energies

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“…As a result, the introduced dimensionless temperature ratios do not depend on both the absorbed heat and emissivity. The detailed derivation of the linear dependence of the temperature from the heat flux (constant in space and step-wise decaying in time) using Green’s function is shown in Appendix A of the reference (Adamczyk et al , 2017).…”

Section: Numerical Modelmentioning

confidence: 99%

Application of numerical procedure for thermal diagnostics of the delamination of strengthening material at concrete construction

Adamczyk

Górski

Ostrowski

et al. 2019

HFF

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Purpose Large structural objects, primarily concrete bridges, can be reinforced by gluing to their stretched surface tapes of ﬁber-reinforced polymer (FRP). The condition for this technology to work requires the quality of the bonding of FRP and the concrete to be perfect. Possible defects may arise in the phase of construction but also as a result of long-term fatigue loads. These defects having different forms of voids and discontinuities in the bonding layer are diﬃcult to detect by optical inspection. This paper aims to describe the development of a rapid and nondestructive method for quantitative assessment of the debonding between materials. Design/methodology/approach The applied technique belongs to the wide class of active infrared (IR) thermography, the principle of which is to heat (or cool) the investigated object, and determine the properties of interest from the recorded, by an IR camera, temperature ﬁeld. The methodology implemented in this work is to uniformly heat for a few seconds, using a set of halogen lamps, the FRP surface attached to the concrete. The parameter of interest is the thermal resistance of the layer separating the polymer tape and the concrete. The presence of voids and debonding will result in large values of this resistance. Its value is retrieved by solving an inverse transient heat conduction problem. This is accomplished by minimizing, in the sense of least squares, the difference between the recorded and simulated temperatures. The latter is deﬁned as a solution of a 1D transient heat conduction problem with the already mentioned thermal resistance treated as the only decision variable. Findings A general method has been developed, which detects debonding of the FRP tapes from the concrete. The method is rapid and nondestructive. Owing to a special selection of the compared dimensionless measured and simulated temperatures, the method is not sensitive to the surface quality (roughness and emissivity). Measurements and calculation may be executed within seconds. The eﬃciency of the technique has been shown at a sample, where the defects have been artiﬁcially introduced in a controlled manner. Originality/value A quantitative assessment procedure which can be used to determine the extent of the debonding has been developed. The procedure uses inverse technique whose result is the unknown thermal resistance between the member and the FRP strip.

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“…However, all methods mentioned above require at least a subset of the classic thermal material parameters to be known, which especially includes the thermal conductivity of the body under consideration. These material parameters are usually identified by means of highly specialized experiments, for example, by using a guarded hot plate [9] or laser flashes, see, for example, [1,13]. For the inverse analysis of these experiments, either isothermal or adiabatic boundary conditions are applied, so that a heat transfer coefficient is not required and therefore neither needs to be estimated nor identified.…”

Section: Introductionmentioning

confidence: 99%

On the determination of thermal boundary conditions for parameter identifications of thermo‐mechanically coupled material models

Rose

Menzel

2022

GAMM-Mitteilungen

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Identifiability and sensitivity of thermal boundary coefficients identified alongside thermal material parameters by means of full field measurements during a simple tension test are shown empirically using a simple tension test with self heating as a proof of concept. The identification is started for 10 different initial guesses, all of which converge toward the same optimum. The solution appears to be locally unique and parameters therefore independent, but a comparison against a reference solution indicates high correlation between three model parameters and the prescribed external temperatures required to model heat exchange with either air or clamping jaws. This sensitivity is further analyzed by rerunning the identification with different prescribed external temperatures and by comparing the obtained optimal parameter values. Although the model parameters are independent, optimal values for heat conduction and the heat transfer coefficients are highly correlated as well as sensitive with respect to a change, respectively, measurement error of the external temperatures. A precise fit on the basis of a simple tension test therefore requires precise measurements and a suitable material model which is able to accurately predict dissipated energy.

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Nondestructive technique of measuring heat conductivity of thermal barrier coatings

Cited by 23 publications

References 23 publications

Modeling of Energy Consumption and Reduction of Pollutant Emissions in a Walking Beam Furnace Using the Expert Method—Case Study

Modeling of Energy Consumption and Reduction of Pollutant Emissions in a Walking Beam Furnace Using the Expert Method—Case Study

Application of numerical procedure for thermal diagnostics of the delamination of strengthening material at concrete construction

On the determination of thermal boundary conditions for parameter identifications of thermo‐mechanically coupled material models

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