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 20 for “"bulk temperature"”.
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Investigation of the effect of microwave irradiation (2.45 GHz) on biological systems at constant bulk temperature
… effect of MW irradiation (2.45 GHz) at constant bulk temperature was investigated on several biological systems. Studies on enzymatic activity revealed that MW irradiation could enhance the activity of trypsin, however the enzymatic activity of α-amylase and alkaline phosphatase towards the …
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Probabilistic analysis of turbine blade durability
… ranges of design parameters examined. For the temperature range studied fatigue was the primary damage mechanism. The variation in cooling air bulk temperature was most important in setting the variation in blade durability life. This life variation was also affected by main gas bulk …
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Ultrafast Temperature Jump Study of Energy Transfer in Dye-Doped Polymer Films
… is deposited in a molecular solid sample and the temperature is accurately measured. This technique, termed ultrafast optical calorimetry, permits the generation and measurement of molecular hot spots of several hundred degrees and bulk temperature jumps exceeding one hundred degrees at a heating …
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A Detailed Uncertainty Analysis of Heat Transfer Experiments Using Temperature Sensitive Paint
… are performed and the data are collected via temperature sensitive paint, ammeter, thermocouple and manometer measurement techniques. These data are subjected to uncertainty analysis and the major contributing parameter in the uncertainty is found. A tool to identify the major contributing …
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Design, fabrication, and performance of a gas-turbine engine from an automobile turbocharger
… efficiency and net work ratio from air temperature measurements in three stages of the cycle. The gas-turbine engine is made from an automobile turbocharger for its common shaft turbine and compressor. A combustion chamber was placed between the outlet of the compressor and the inlet of …
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Non-equilibrium effects on in-tube condensation from superheated vapor
… As a result, the thermodynamically averaged temperature, namely the bulk temperature, of the refrigerant decreases. Conventionally when a 3-zone approach is adopted, as the specific enthalpy of the refrigerant flow becomes that of bulk quality one, the first droplet of condensate forms, …
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Influential cooling of the free surface by jet impingement of aqueous nanodispersion dominant with hybridized nanoparticles
… engine's thermal conditions and reactions. The bulk metal temperature and local thermal stresses have the most significant impact on the life expectancy of the hot gas path component. The component will break sooner if the bulk temperature is too high, but cracks will form, spread, and …
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Two-dimensional finite element model for heat transfer in residential attic using an attic barrier system
… different solar insolation fluxes and ambient temperatures as driving functions at several discrete hourly values during the day. A ({dollar}k-\varepsilon{dollar}) turbulent model has been used to describe velocity and thermal distributions in the attic. Several recirculation zones have been …
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Effects of temperature conditions and heat treatment within a multiple effect evaporator on thin stillage fouling characteristics
… Arora et al 2010, Challa et al 2014). However, temperature and heat treatment effects on thin still fouling have not been studied. This study investigated the influence of bulk fluid and initial probe temperatures on thin stillage fouling characteristics. Experiments were conducted using model …
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Modeling the solar thermal receiver for the CSPonD Project
… is a one dimensional resistance model which uses bulk temperatures for the top and bottom layers of salt. An assumption needed to be made to allow the model to be solvable, so it was modeled using two different assumptions, a given energy input and a given top salt bulk temperature. The system was …
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Artificial Neural Network for Predicting Heat Transfer Rates in Supercritical Carbon Dioxide
… computational fluid dynamics analysis. The bulk temperature and wall temperature data were obtained for a range of heat flux (q = [6, 12, 24, 36, 48]) and mass flux (G = [200, 400, 600, 800, 1000]) conditions. An artificial neural network base model was trained, validated, and tested using …
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Research on the Performance of JP-8, Single Fuel Concept, in Diesel Engine Application for Airport Ground Support Equipment
… while increasing the bmep. Combustion maximum bulk temperature was in the range of 1550 K to 2200K, and also increased with load. Both mechanical and overall efficiencies increased with bmep at constant speed but were minimally influenced by the fuel blend. Soot showed an increase at higher …
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Heat extraction for the CSPonD thermal storage unit
… were modeled as a tube with a constant wall temperature. Air is used as the working fluid, with a maximum Reynolds number of 2000 at a maximum flow rate of 10 standard liters per minute (SLPM) at air flow temperatures above 900°C. The accuracy of the power extraction model for the three …
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Multiphase Interfacial Phenomena for Liquid Manipulation and Defrosting
… flow. Chapter 4 examines the behavior of room temperature water droplets spreading on a flat icy substrate. The use of flat ice, as opposed to cold substrates, eliminates the nucleation energy barrier, enabling freeze front initiation as soon as the bulk temperature of the spreading drop …
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Experimental and Modeling of Pneumatic Tire Performance on Ice
… Tire-Ice Interface Model serves to simulate the temperature rise at the contact patch based on the pressure distribution in the contact patch, thermal properties of the tread compound and of the ice surface. Since its initial development, the advanced model is now capable of simulating the thin …
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An Effective Methodology for Thermal-Hydraulics Analysis of a VHTR Core and Fuel Elements
The Very High Temperature Reactor (VHTR) is a Generation-IV design in the conceptual pre-licensing phase for potential construction by 2030-2050. It is graphite moderated, helium cooled reactor that operates at an exit temperature of up to 1273 K, making it ideal for generating electricity at a …
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Development of a ferroelectric plasma source through material degradation studies and characterization of volume and surface discharges
… methods described in the literature. Both the bulk ferroelectric properties and surface structure of PZT were characterized. Materials characterization takes place through the use of X-ray Photoelectron Spectroscopy (XPS), scanning electron microscopy (SEM) and Energy Dispersive X-ray …
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Isothermal microwave biology : catalysis and fermentation
… production costs and infrastructure prevents bulk volume exploitation. Biomolecular advances (amino acid substitutions, recombination of expression vectors etc) have gone some way to increase either enzymatic rate or enzyme concentration. The work presented in this thesis differs by increasing …
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Calculation of Local Heat Transfer Coefficients in Containment After a Loca
Made available in DSpace on 2017-07-06T18:55:06Z (GMT). No. of bitstreams: 3 Leung_Dominic_M_MS.pdf: 34136601 bytes, checksum: 44a40444c0e1c70eae6f96ecb6746631 (MD5) Leung_Dominic_M_MS_ABS.pdf: 452218 bytes, checksum: 53d9dd977a0bc1f5e2366ff5d6d3ba43 (MD5) license.txt: 4813 bytes, checksum: …
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Radio frequency plasma synthesis of ultrafine titanium carbide powders
… to bring all streams entering the process to a bulk temperature of around 4000 K. The major enthalpy demands for this process were heating the Ar flow required for torch operation and the natural gas reactant stream. Future experiments should not use upstream injection of reactant gases so that …