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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

High Temperature Biaxial Creep of Zirconium Alloy Tubing

Hajdo, Leslie A. January 1972 (has links)
xiv, 133 leaves : illustrations.

Heat Transfer Analysis of a Small Thermochemical Reactor for Hydrogen Production from Ammonia

Owusu-Ansah, Nana 08 1900 (has links)
Several types of research are ongoing throughout the world, to discover economical and reliable techniques to create hydrogen, and propagate the vision of a hydrogen economy. This research examines a COMSOL Multiphysics 5.4 heat transfer model for a hydrogen production system consisting of a retort with two different heat sources, namely a heat tape and an infrared (IR) lamp. The main objective was to compare the two heat sources and find out which one offers a better technique for producing hydrogen by raising the internal center core temperature of the retort from ambient to the highest temperature, preferably 700℃, within the shortest time possible and using less power consumption in attaining the targeted temperature. Through this study, it was established that the IR lamp could potentially help with energy savings by using just 4 kWh to reach the targeted temperature within an hour.

Characteristics of multimode heat transfer in a differentially-heated horizontal rectangular duct

Wangdhamkoom, Panitan January 2007 (has links)
This study presents the numerical analysis of steady laminar flow heat transfer in a horizontal rectangular duct with differential heating on the vertical walls. Three heating configurations: one uniform wall temperature (CS1) and two linearly varying wall temperature cases (CS2 and CS3) are analysed. The study considers the combined effects of natural convection, forced convection and radiation heat transfer on the overall heat transfer characteristics. Air, which is assumed to be a non-participating medium, is chosen as the working fluid. A computational fluid dynamics solver is used to solve a set of governing equations for a range of parameters.For chosen duct aspect ratios, the numerical model simulates the flow and heat transfer for two main effects: buoyancy and radiation heat transfer. Buoyancy effect is represented by Grashof number, which is varied from 2,000 to 1,000,000. The effect of radiation heat transfer is examined by choosing different wall surface emissivity values. The weak and strong radiation effect is represented by the emissivity values of 0.05 and 0.85 respectively. Three duct aspect ratios are considered - 0.5, 1 and 2. The heat transfer characteristics of all the above heating configurations - CS1, CS2, and CS3 are analysed and compared. The numerical results show that, for all heating configurations and duct aspect ratios, the overall heat transfer rate is enhanced when the buoyancy effect increases. Since buoyancy effect induces natural circulation, this circulation is therefore the main mechanism that enhances heat transfer. Radiation heat transfer is found to significantly influence convection heat transfer in high Grashof numbers.

Experimental studies on natural and forced convection around spherical and mushroom shaped particles

Alhamdan, Abdullah M. January 1989 (has links)
No description available.

Heat and mass transfer in specific aerosol systems

Glockling, James L. D. January 1991 (has links)
No description available.

Condensation, heat transfer and pressure drop inside micro-fin tubes : optimization of fin characteristics

Naser, Adel Daw January 2003 (has links)
No description available.

Thermal convection within the Earth's crust

Bruce, Paul Michael January 1989 (has links)
No description available.

Length to diameter ratio effects on friction and heat transfer of turbulent flow in a porous tube

Hasan, H. A. A. January 1984 (has links)
No description available.

Modelling of radiation in laminar flames

Liu, Yan January 1994 (has links)
No description available.

Heat transfer in a motored reciprocating engine

Al-Sudani, A. January 1985 (has links)
No description available.

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