Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Uniform heating"”.
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Uniform heating of thin ceramic slabs in a multimode microwave cavity
… term, are good models for describing microwave heating of thin ceramic slabs and cylinders in a multi mode, highly resonant cavity. A thin ceramic slab situated in a TEN03 rectangular cavity modeled in the small Biot number limit and a thin silicon wafer situated in a TM101 cylindrical cavity …
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Heating of solid matter via laser generated electrons
This thesis reports on numerical studies of the heating of solid targets via laser generated fast electron beams, which allows for better understanding and optimisation of the generation of hot dense matter in a laboratory setting. The work is split into 3 main investigations which are summarised …
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3D Temperature Imaging Using Ultrasonic Backscatter Energy during Non-Uniform Tissue Heating
… and used to estimate temperature during non-uniform heating. <p>Methods: For accurate temperature measurement, a grid of thermocouples was calibrated using a NIST- traceable thermometer. 3D ultrasonic data sets were obtained by moving a 7.5 MHz linear, phased-array transducer in 0.6 mm steps …
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Field Simulation for the Microwave Heating of Thin Ceramic Fibers
… area of interest is the exploration of improved heating control through experiments and numerical modeling. Controlled heating may be used to counteract non-uniform heating and avoid destructive phenomena such as cracking and thermal runaway. Thermal runaway is a potential problem in materials …
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Intelligent Non-destructive Measurement and Evaluation Techniques for Aircraft Composites
… thermal contrast are strongly affected by non-uniform heating which due to the heat source alignment and specimen thickness variation. The proposed polynomial curve fitting and surface fitting techniques were applied to eliminate the non-uniform heating effect by subtracting the estimated …
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Non-intrusive two-phase flow regime identification and transport characterization in microchannels subject to uniform and non-uniform heat input
… that provide high rates of heat transfer at a uniform heat sink temperature. Under two-phase flow conditions, the heat transfer and pressure drop are a function of the local flow regime. Development of sensors that detect local void fraction and flow regimes may enable better understanding of …
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Flow Boiling in Meso-Scale Pin-Fin Coldplates
… transfer coefficients and improved temperature uniformity. Recent flow boiling studies have focused on fin-enhanced silicon microgaps and microchannels, given their importance in cooling high-power-density chips operating at ultra-high heat fluxes. However, the majority of the research on flow …
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Strain rate and temperature dependent mechanical behavior of nanocrystalline gold
… at temperatures up to 110˚C. Two methods for heating free-standing microscale thin film specimens, namely uniform heating using a custom-built microheater and resistive (Joule) heating, were evaluated using a combination of full-field strain measurements by optical microscopy and full-field …
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Simulation of Microwave Heating of Mullite Rods
… processing has been studied as an alternate heating technique over conventional heating for industrial applications. Some advantages include quicker and more uniform heating. Also, microwave energy offers the advantage of localized heating and smaller-sized equipment. Many ceramics, however, …
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Role of electric field profiles in continuous microwave processing of thermal runaway materials
Microwave processing presents a relatively new heating source for a large variety of processes and materials. Depositing microwave energy volumetrically, microwave heating appears as a good alternative for sintering ceramics by decreasing the process time, offering better energy efficiency, but …
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Fabrication of a nanoporous membrane device for high heat flux evaporative cooling
… and overall device performance arising from non-uniform heating and evaporation of methanol was captured experimentally. Heat fluxes up to 412 W/cm2, over an area of O.4x 5 mm, and with a temperature rise of 24.1 K from the heated substrate to ambient vapor, were obtained. These results are in …
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Experimental Verification for Microwave Processing of Materials in a Single Mode Rectangular Resonant Cavity
… The potential benefits over conventional oven heating include faster processing times, more uniform heating, more consistent product quality, and the possibility of precise control. The actual implementation of microwave technology has been lacking and the benefits have gone largely unrealized. …
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3-D temperature distributions in spot heating of a ceramic by a focused microwave source
… applicators which produce localized spot heating of a workpiece with a Gaussian spatial distribution of microwave power. Applicators of this type provide a nearly ideal heating pattern for joining of ceramics and other applications requiring localized heating, and offer several advantages …
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Experimental and Theoretical Study of Microwave Heating of Thermal Runaway Materials
… of microwave processing of materials is in heating. The most important characteristic of microwave heating is {\it volumetric} heating, which is quite different from conventional heating where the heat must diffuse in from the surface of the material. Volumetric heating means that materials …
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A Fiber-Based Approach for Modeling Beam-Columns under Fire Loading
… Analyses of structures subjected to non-uniform heating emphasize the advantages of the fiber-based approach. To demonstrate a realistic application of the proposed approach, the work concludes with an investigation of the response of unprotected steel beams subjected to localized fires. …
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Nanometer-scale temperature measurements of phase change memory and carbon nanomaterials
… measurements and predictions of CVD graphene heating predicted the resistivity, voltage drop, and temperature rise across the one dimensional (1D) GB defects. This work measured the nanometer-scale temperature rise of thin film Ge2Sb2Te5 (GST) based PCM due to Joule, thermoelectric, interface, …
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Development of microreactor setups for microwave organic synthesis
… of this work is the understanding of microwave heating and the microreactor design challenges involved through both chemical experiments and computational models. The original goal of this research is to develop a microreactor system in order to carry the microwave organic synthesis in …
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Experimental Evaluation of Innovative Thermal Energy Storage Options for a Hypersonic Non-Airbreathing Vehicle's Internal Loads
… of the latter is that it results in a more uniform cooling of the heat source and more uniform heating of the heat sink. Prototypes of each of the heat sink concepts and the coolant loop are designed, built, and tested. Experimental results indicate that all the solutions tested in this …
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Heat resistance of Salmonella typhimurium and Listeria monocytogenes in suspension and in a biofilm matrix
… TDT tubes that were completely submerged in the heating menstrum. Biofilms were grown on Buna-n rubber o-rings (4.46 mm O.D. x 1.41 mm]. D.) for 36 hours. All other cultures used were in stationary phase of growth. The three treatments tested were: inoculated milk, sterile milk and a biofilm on …
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A study of microwave TDFT applicator design for low power cancer ablation
… input power which yields lack of control over heating encountered with previously proposed applicator designs. This work investigates the efficacy of using low power ultra-wide band (UWB) microwave applicator in cancer ablation. A novel Tear Drop Flared tipped (TDFT) antenna was proposed as …
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