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 46 for “"heat pipes"”.
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An investigation into gravity independent oscillating heat pipes
… AT AUTHOR'S REQUEST.] A number of oscillating heat pipes (OHPs) with unbalanced structures were investigated in an effort to develop methods enabling OHPs to be gravity independent. The unbalanced structures investigated herein include the effects of uneven turn and check valves. Two 2-D and …
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Oscillating heat pipes : study of their oscillating motion using neutron imaging and application
… in science and industry. Oscillating heat pipes (OHP) are being studied as a higher performance way of cooling high power electronics. The oscillating motion of the liquid in an OHP has a significant role in the performance. However, the fluid dynamics in an OHP are very chaotic and …
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NUMERICAL AND EXPERIMENTAL ANALYSIS OF HEAT PIPES WITH APPLICATION IN CONCENTRATED SOLAR POWER SYSTEMS
… conductivity of the PCM, which decreases the heat transfer rate between the heat source and PCM, which therefore prolongs the melting, or solidification process, and results in overheating the interface wall. To address this issue, heat pipes are embedded in the PCM to enhance the heat …
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Latent Heat Thermal Energy Storage with Embedded Heat Pipes for Concentrating Solar Power Applications
<p>An innovative, novel concept of combining heat pipes with latent heat thermal energy storage (LHTES) for concentrating solar power (CSP) applications is explored. The low thermal conductivity of phase change materials (PCMs) used in LHTES presents a design challenge due to slow heat transfer …
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Steady State Mathematical Modeling of Non-Conventional Loop Heat Pipes: A Parametric and a Design Approach
A Non-Conventional Loop Heat Pipe, much different from a conventional LHP, is employed in cooling Light Emitting Diode luminaries in high bay lighting. Different from a conventional LHP, these devices use the entrainment phenomenon to passively transport waste thermal energy dissipated from the …
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Experimental Investigation and Validation of Boiling and Condensation Thermal Resistances in Cylindrical Thermosyphons and Screen-Wick Heat Pipes.
Thermosyphons (TS) and heat pipes (HP) are passive two-phase thermal transport devices capable of transferring high heat loads with small temperature differences in thermal management applications. This thesis aims to improve the design-stage prediction of TS and HP performance, where device …
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Heat Pipes for the Thermal Management of High Frequency Transformers in the Navy integrated Power Electronics Building Block
… of modern electronics; however, the high heat generation of these components, 9.6 kW from the MOSFET switches and 624 W from the transformer, makes thermal management crucial to their successful implementation. As a result of additional requirements, indirect liquid cooling using a …
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Conceptual Design of a Nuclear Microreactor Transportation Cask
… using a sample microreactor core design with heat pipes. An adequate shutdown reactivity margin (k_{eff} < 0.95) can be maintained using the control drums and shutdown rods except if the heat pipes are broken open and flooded with water. Shielding the gamma radiation so that the dose rate at a …
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Experimental Investigation and CFD Modelling of a Thermosyphon-equipped Heat Exchanger used in Low-grade Waste Heat Recovery
Energy lost in the form of heat is reported to account for more than 50% of the total energy waste in industry. Due to renewed environmental policies with focus on promoting sustainability and reducing wasted energy, new measures have been put in place to reduce these energy losses. In industry, …
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Thermal performance of a Nam-Ju nanostructured copper oscillating heat pipe
… management systems are necessary to combat high heat fluxes. Copper heat pipes, and oscillating heat pipes are devices commonly used in the electronics industry to remove high heat fluxes, safeguarding sensitive electronic components from thermal damage. The surface application of cupric oxide …
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Design, Fabrication, and Experimental Investigation of an Additively Manufactured Flat Plate Heat Pipe
Heat pipes are passive heat transfer devices in which a working fluid is sealed inside a metal enclosure. Properly designed wick structures on the inner surface of the heat pipe are critical as the wick aids in the return of the condensed liquid from the cold end back to the hot end where the …
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Tubo de calor de água, um estudo teórico-experimental
… and experimental thermal evaluation of heat pipes. The model suggested by SUN and TIEN for theoretical steady-state heat pipe performance was solved for a new condition of cooling fluid and used for predicting the wall temperature profile and saturated vapor temperature. A water heat …
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Modeling Two-Phase Flow and Heat Transfer in Polygonal Microchannels
… an improved understanding of two-phase flow and heat transfer in microfluidic devices. We also study a third problem on boundary layer flow out of theoretical interest. In the first problem, we study the heat and mass transfer in polygonal micro heat pipes under small imposed temperature …
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Numerical and experimental investigation of composite heat pipe technology
Heat pipes are heat transport devices that pose very small thermal resistance to heat flow, even over relatively long transport paths. Utilizing two-phase heat transfer, they can transport heat from con fined spaces to remote heat sinks where more surface area might be readily available. This …
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Capillary Pumped Loop Performance Investigation through Flow Visualization
… two-phase thermal control devices which, like heat pipes, use surface tension forces to circulate a cooling fluid from an evaporator to a condenser. The pressure difference for fluid circulation is developed in the pores of a wick structure located in the evaporator. Unlike heat pipes, CPLs …
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Development of an air-cooled, loop-type heat pipe with multiple condensers
… to high performance computing systems. Heat pipes are capillary-pumped devices that take advantage of the latent heat of vaporization of a working fluid to achieve low thermal resistance (~0.1 °C/W), and have been of particular interest to address these thermal management needs for …
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Numerical and analytical modelling of battery thermal management using passive cooling systems
… in conjunction with the thermal model of the heat pipe. The proposed model is compared to an analytical solution based on variable separation as well as three-dimensional (3D) computational fluid dynamics (CFD) simulations. The three approaches, i.e. the 1D computational model, analytical …
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Optimización del diseño de panel solar híbrido para edificación
… transferencia de calor en el PCM, se incorporan heat pipes que transfieren el calor hacia la parte trasera del PCM. Los diferentes diseños se han testado en el banco de pruebas donde se ha observado la eficacia del PCM en los paneles PV/T al incrementar su eficiencia eléctrica. Adicionalmente, se …
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