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Battaglia, Jean-Luc Publication Timeline. Most widely held works by Jean-Luc Battaglia. Heat transfer in materials forming processes : with exercises and solutions by Jean-Luc Battaglia Book 8 editions published in in English and Polish and held by 94 WorldCat member libraries worldwide "This book deals with the solution of thermal problems in various processes, such as molding, cutting, welding or grinding, involved in working with or manufacturing materials.

The first is analytical, leading to general solutions that are well-adapted to the needs for the engineer at the time of the first dimensioning of the processes. This approach also provides tools for fast analysis with respect to the contribution of each transfer in a total assessment.

This method makes it possible to solve each problem with greater precision but at the price of an implementation longer and more expensive, thus providing the reader with the advantages and disadvantages of the different approaches, so that they can make a more informed decision when applying these methods.

The lighting market is changing as needs have changed: we would like, for example, reduce power consumption, or have more flexible lighting color, lighting cycle, dimensions High brightness LEDs help provide solutions where others are lighting defects. A comparative study is conducted between the LEDs and other lighting sources.

The operation of a high brightness LED emitting white light is explained with the description of each element: chip, substrate, the PAD and optics. The phosphor has a significant optical role and an important thermal role. After being excited by the light emitted from the chip, it re-emits light in a greater wavelength. The effectiveness of this process depends on many parameters, such as the implementation of the phosphor, or the type of phosphor used.

The study and characterization of optical and thermal properties are made for commercial LEDs, composed of a single chip emitting blue light with and without yellow phosphor. To master the maximum factors, we conducted a study and design of the printed circuit board PCB on which will be implanted our LEDs.

In order to evaluate the materials constituting the LEDs, analyzes made at scanning electron microscope, and by microprobe were conducted. This work has revealed in particular the position of the p-n junction in the chip, and the composition of the phosphor layer of two different types. Moreover, to improve our understanding, a comparative study will be conducted on three yellow phosphors.

Then the two types of LEDs, bare chip and chip with phosphor, were tested in order to obtain the luminous flux and efficiency of LEDs. The optical characterization has led us to create a bench for spectral radiance over a small portion of the chip. Furthermore, we are interested in the junction temperature of the bare chip, which we measure by various methods, including infrared thermography.

For this, the emissivity was estimated for the bare chip and the chip with phosphor. The mesh of conductive wires, implanted on the surface of the chip, is electrically modeled.

The study, which is composed of three progressive levels of modeling, provides an understanding of distribution of the electric current through the junction, and thus to understand the distribution of the light flow and temperature at the surface of the chip. Afterwards, an optical-thermal model describes the phenomena present at the junction of a bare chip: converting electrical power into blue light and heat, and heat transfer.

We complete this first model for a model of a chip with the phosphor. This model takes into account the photo-conversion of the phosphor with the calculation of the luminous flux at the output of the phosphor and the calculation of the heat due to the photo-conversion.

The resolution of this model allows us to obtain the junction temperature of a chip with phosphor. The model of energy conservation is also verified.

The optical-thermal model is applied to a surface temperature mapping in order to obtain a mapping of the junction temperature. These maps are combined with pictures of infrared thermography and radiance. These thermal conductivities are accounted to the presence of strong covalent bonds and increased relative densities.

The role of these interphases is also discussed regarding the phonon transmission at the interfaces. Infrared image processing for the evaluation of thermal bridges in high performance insulating systems by David Mourand 1 edition published in in English and held by 1 WorldCat member library worldwide An image processing method for the estimation of the relative thermal properties of a thermal bridge between two homogeneous layers by infrared thermography is proposed.

The processing of the sequence of images oftemperature must be related to a 3D transient heat transfer model. The complete analytical solution of the direct problem can be conveniently obtained with a Fourier transfonn following space variables quadrupoles method. A suitable linear approximated solution of direct transient 3D model allows to implement a linear least square estimation method from the Fourier transform of the images at each time step.

A standard module in the field of power electronics is composed of a silicon chip, an electrical insulator substrate and a heat sink drain for the evacuation of heat. This heat induces thermomechanical stresses due to differential expansion of materials. Two new concepts proposed can overcome these problems and increase the overall reliability of electronic systems. The first is the design and development of a drain composite adaptive thermal properties thermal expansion coefficient and thermal conductivity.

In the second, a new assembly method is presented. It allows, by means of a metal film Sn or Au, intermetallic compounds to create stable over time. Some issues, including icing compaction, reduce its use.

The introduction of new materials, including special wetting properties, is an innovative way. The study of displacement of drops and liquid bridges between fins, by solving the Navier-Stokes equations, allows us to understand local flows and to characterize the effect of wetting numerical model of contact angle which depends on controlling the smoothing of Volume Of Fluid function and of containment.

Several studies have been conducted on the drops and liquid bridges submitted to flow on sloping walls, driving to significant behaviors. These studies can implement effective solutions to industrial difficulties. An approach to extreme wetting phenomena superhydrophobicity was performed and showed their interest to a good evacuation efficiency but also the cost to achieve the simulations.

Several possibilities were discussed to overcome this difficulty. In parallel, a method of phase change was developed in the code of scientific computing Thetis to simulate the evacuation of ice during defrosting periods on simple geometries or more complex ones. An innovative approach based on Volume Of Fluid method, derived from methods available in Front-Tracking shows its feasibility and efficiency.

PTR measures the emitted thermal radiation from a sample to determine the thermal response. The work presented here further develops the PTR theory by including the nonlinear dependence of thermal emission with respect to temperature.

This more advanced PTR theory is numerically and experimentally explored in this work. A thermal effusivity measurement technique and two new pyrometry techniques are developed and experimentally tested using the nonlinear dependence in the PTR theory.

The first pyrometry technique allows for accurate temperature measurement during a traditional PTR measurement.

This has many applications when the sample is sensitive to an increase in temperature and possibly damaged due to overheating. The second pyrometry technique does not require emissivity to be known, measured, or rely on a gray body assumption. The measurement can be influenced greatly by any error in the bandwidth of optical filters used in the measurement, and it is very sensitive to any nonlinearity in the detection system.

From the experimental results, design guidelines are provided to minimize these two drawbacks of the technique for future exploration. The direct thermal effusivity measurement developed allows for a non-contact, direct measurement of thermal effusivity of a homogenous material.

This type of measurement has not been achieved with any other technique. The experimental effusivity results from this technique show excellent agreement with literature values. These techniques, already developed and applied to metallic materials are based on the detection of the heating generated in a vibrating material by viscoelastic effects and friction of the crack surfaces. In the first part of the manuscript an NDT technique is developed to analyse the diffuse damage of a woven composite and to determine a relation between its damage state and its thermal behaviour.

This part is important to understand the phenomena that govern vibrothermography with a first estimation of the thermal sources. In the second part, vibrothermography is applied to study the fatigue behaviour and to estimate a fatigue limit of woven composites.

This estimation differs from the standard mechanical estimation based on the analysis of the S-N curves because it is carried out on a single, unique sample and over a much shorter duration. It may be used to improve the understanding of the fatigue damage of materials and to help engineers to design structures subjected to this kind of stress. Heat transfer control in a holding furnace is crucial to ensure the quality of manufacturing.

This work has 3 major parts, which are the detailed modelling, reduced modelling and experiments. Modelling takes as inputs the electric power consumed by inductors and gives the temperature field in the heating module. The studied reduced models are phyisical convolutive models enthalpic 0D , 1 dimension analytical 1D and parametric like AutoRegressive with eXogeneous inputs ARX. ARX models have been compared to convolutive models identification, validation.

The goal is to get temperatures in the heating module without local presence of physical sensors virtual sensor. Detailed and reduced models have been compared to experiments on the furnace. This last part is not described in this document. Audience Level. Related Identities. Associated Subjects. Heat--Transmission Manufacturing processes Metal-work. French 35 English 10 Polish 1. Author , , Thesis advisor , Opponent , Other , , Editor.

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Battaglia, Jean-Luc (1967- ...).



Meaning of "quadripĂ´le" in the French dictionary



Exercice No 21 corrigé.pdf


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