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 105 for “"heat exchange"”.
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Transient response of laminar-flow heat exchange, The
Includes bibliographical references (pages 62-63).
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Radiant heat exchange in gas-filled slabs and cylinders
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1959.
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Experimental Investigation of Heat Exchange between Thermal Mass and Room Environments
… described in this thesis is the investigation of heat transfer at a heated ceiling in an experimental chamber. Acoustic baffles obstruct the surface of the ceiling and impede heat transfer. However, there is nearly no published data about the effect of such baffles on heat transfer. Available …
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Development of Temperature Profile for Turbulent Heat Exchange in a Pipe
Made available in DSpace on 2014-12-05T17:15:36Z (GMT). No. of bitstreams: 1 6104319.pdf: 4466986 bytes, checksum: 26c5c3c1dbb1412e49daac5b7392928c (MD5) Previous issue date: 1961
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Measuring heat exchange processes at the air-water interface from thermographic image sequence analysis
In this thesis a novel technique for estimating heat transfer at the free air water interface is presented. For the first time spatially resolved heat flux and transfer velocity measurements are available with a high temporal resolution. The statistical properties of the transfer processes are …
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Investigation of solid polymeric hollow fiber heat exchange devices for use in thermally-driven desalination processes
The heat exchange between hot brine (4 wt% NaCl) and cold water as well as between condensing steam and cold water without direct fluid-fluid contact using modules made out of solid polymeric hollow fibers of polypropylene (PP) and polyetheretherketone (PEEK) has been studied. The solid hollow …
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Bactericidal efficiency of a helically coiled tube turbulent flow processing system
… information were available on flow properties, heat exchange characteristics, and on lethality of selected microorganisms. The two general types of URT processing equipment are the direct and indirect heat exchange systems. In the direct system, heating of the product involves direct contact …
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Performance and optimization of microchannel condensers
… study is the first to document the condensation heat transfer performance of small diameter, microchannel tubes in crossflow heat exchange, and this study provides the first systematic evaluation of the effect of port shape on microchannel tube performance. Furthermore, this study is the first to …
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Heat transfer via dropwise condensation on hydrophobic microstructured surfaces
… has the potential to greatly increase heat transfer rates. Heat transfer coefficients by dropwise condensation and film condensation on microstructured silicon chips were compared. Heat transfer coefficients are found to be seventy percent higher in the hydrophobic, dropwise …
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Bipolar thermoelectric devices
… here is a theoretical and experimental study of heat production and transport in bipolar electrical devices, with detailed treatment of thermoelectric effects. Both homojunction and heterojunction devices are considered, and particular attention is given to semiconductor laser diodes. The …
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Orientation Preference and Behavioural Thermoregulatory Coordination in Pogona vitticeps.
… that rely on ambient temperature as a heat source (ectotherms) make use of multiple voluntary and involuntary behaviours to thermoregulate, including body orientation. The purpose of this work was to examine orientation behaviour in bearded dragons (Pogona vitticeps) as well as possible …
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Regulation of surface temperature in mammals
… responses were evaluated in terms of effect on heat exchange and thermoregulatory ability. The responses of 21 species were summarized in three-dimensional graphs combining ambient temperature, surface to ambient temperature gradient, and percent of total surface area represented by that …
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The sea surface heat balance in the Benguela upwelling region
The surface heat balance of the Benguela upwelling area on the west coast of southern Africa is analysed. Measurements of the components of the heat balance were made in the St Helena Bay area from 14-21 October 1986. Additional long-term data was obtained from Alexander Bay and Cape Town. An …
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Synergistic diffuser/heat-exchanger design
… numerical evaluation of synergistic diffusing heat-exchanger design is presented. Motivation for this development is based on current diffuser and heat-exchange technologies in cogeneration plants, which require a large geometric footprint to generate steam using gas-turbine exhaust. A compact …
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Numerical simulations of perforated plate stabilized premixed flames with detailed chemistry
… consisting of 20 species and 79 reactions. Heat exchange is allowed between the gas mixture and the solid plate. The physical model is based on a zero-Mach-number formulation of the axi-symmetric compressible conservation equations. The steady results suggest that the flame consumption …
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Secondary Clarifier Modeling: A Multi-Process Approach
… rheology, flocculation, temperature changes and heat exchange, geometry, loading, the nature of the floc, the atmospheric conditions and the total dissolved solids concentration. A Quasi-3D (Q3D) clarifier model has been developed to include the following factors: axisymmetric hydrodynamics …
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Thermo-Mechanical Behavior of Energy Piles: Full-Scale Field Testing and Numerical Modeling
… The use of energy piles for geothermal heat exchange has been steadily increasing during the last decade, yet there are still pending questions on their thermo-mechanical behavior. The change in temperature along energy piles, resulting from their employment in heat exchange operations, …
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Air Circulation Under Reduced Atmospheric Pressures
<p>The control of heat exchange is vital for plant life in off-world, low pressure,</p> <p>greenhouses. The ability to control this process was limited by methodology and</p> <p>technology. Mathematical models, based on classical mechanics are created to enhance</p> <p>our control capabilities. …
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Deep Energy Foundations: Geotechnical Challenges and Design Considerations
… have utilized the ground energy for space heating and cooling. In this system, a circulation loop is placed in a small-diameter borehole typically extending to a depth of 200-300 ft. The hole is then backfilled with a mixture of sand, bentonite and/or cement. The loop is connected to a …
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Additive Manufacturing for Phase Change Thermal Energy Storage and Management
… are highly transient and require pulse heat dissipation. Heat sinks, or thermal management devices made of a phase change material can absorb large heat spikes while maintaining a constant temperature. Additive manufacturing techniques hold tremendous potential to enable co-optimization …
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