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 31 for “"cooling channels"”.
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Investigation of Pin Fin Cooling Channels for Applications in Gas Turbines
… turbine blades are often cooled using internal cooling channels to prevent failure at temperatures beyond material limitations. Pin fin channels are commonly used on the trailing edge of the blades, where they enhance heat transfer and also provide structural support. This study focuses on the …
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Optimization of conformal cooling channels in 3D printed plastic injection molds
… die design is limited to straight (drilled) cooling channels, which dont impart optimal thermal (or thermos-mechanical) per- formance. Moreover, reducing the cycle time in plastic injection molding has become significantly important to the industry nowadays. One approach that has been pro- …
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Design and fabrication of heat transfer-enhancing cooling channels through three dimensional printing
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Computation of heat transfer in turbine rotor blade cooling channels with angled rib turbulators
… in rotating two-pass square and rectangular channels with smooth walls and walls with 45 degree angled and V-shaped rib turbulators were investigated numerically using an unstructured, incompressible, Reynolds-averaged Navier-Stokes flow solver. The influence of 45 degree angled ribs and …
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The effect of synthetic jet driving parameters on heat transfer in microchips cooling channels
… MW mˉ² of the next generation microchips, a new cooling approach has been proposed by combining the merits from forced convection in the microchannel and the synthetic jet impingements. A parametric study has been carried out on the operating conditions on the synthetic jet actuator, these …
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Production of injection molding tooling with conformal cooling channels using the three dimensional printing process
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Multi-step optimization of internal cooling channels for gas turbine vanes using adjoint methods and machine learning
L'abstract è presente nell'allegato / the abstract is in the attachment
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Analysis of Flow and Heat Transfer in the U.S. EPR Heavy Reflector
… heat is removed by the water flowing through 832 cooling channels drilled through the heavy reflector. In this project, the temperature distribution in the heavy reflector was investigated to ascertain that the maximum temperature does not exceed the allowable temperature of 350 C, with the intent …
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Analysis of Cryogenic Cooling of Toroidal Field Magnets for Nuclear Fusion Reactors
… We investigate the heat transfer inside the cooling channels and uid dynamics inside the cooling channels. System-level issues are also investigated, including impact of an insulated versus non-insulated design on cooling performance and cryodistribution architectures to provide coolant …
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An inverted hydride-fueled pressurized water reactor concept
… with cylindrical, vertically oriented, cooling channels, arranged in a triangular lattice. A pin vs inverted comparison, performed at cell level, shows that an inverted geometry can attain the same fuel volume fraction of the pin geometry but with a much lower pressure drop and fuel …
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A 3D Computational Fluid Dynamics Model Validation for Candidate Molybdenum-99 Target Geometry
… range, helium gas is used to server as a cooling agent that flows through narrow channels between the target disks. This thesis investigated the cooling performance on a series of new geometry designs of the cooling channel by using Computational Fluid Dynamics (CFD) software ANSYS FLUENT …
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Conformal cooling and rapid thermal cycling in injection molding with 3D printed tools
… for injection molding tooling through: i)cooling lines which are conformal to the mold surface which provide improved uniformity and stability of mold temperature and ii) tools with low thermal inertia which, in combination with conformal fluid channels allow for rapid heating and cooling …
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An inverted pressurized water reactor design with twisted-tape swirl promoters
… (TTs) as swirl flow promoters inside the IPWR cooling channels. The study focuses on optimizing the cooling channel design with twisted tapes to improve the DNB performance alongside using more powerful reactor coolant pumps to deliver higher core pressure drop limit. Four steady state design …
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Validation of a CFD Approach for Gas Turbine Internal Cooling Passage Heat Transfer Prediction
… Dynamics (CFD) modelling approach for internal cooling passages in rotating turbomachinery. A CFD Modelling approach and accompanying assumptions are tuned and validated against academically available experimental results for various serpentine passages. Criteria of the CFD modelling approach …
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Effect Of Coriolis And Centrifugal Forces On Turbulence And Transport At High Rotation And Buoyancy Numbers
… respectively, both which employ rotating cooling channels so that materials do not fail under high temperature and high stress environment. Prediction of fluid flow and heat transfer inside internal cooling channels that rotate at high rotation number and high density ratio similar to …
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Heat Transfer Coefficient and Adiabatic Effectiveness Measurements for an Internal Turbine Vane Cooling Feature
… of key turbine components. Without active cooling schemes, modern turbines would fail catastrophically. This study will evaluate a novel cooling scheme for turbine airfoils, called microcircuit cooling, in which small cooling channels are located extremely close to the surface of a turbine …
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Modeling temperature distribution in cylindrical lithium ion batteries for use in electric vehicle cooling system design
… the target heat transfer coefficient for an EV cooling system 3) analyze the key design parameters of EV thermal management systems, and, ultimately, 4) determine the method of cooling necessary to prevent thermal runaway. The models are based on the fundamentals of heat transfer and are …
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Development of a Methodology to Measure Aerodynamic Forces on Pin Fins in Channel Flow
… computers. Heat exchangers that utilize internal cooling flows have shown promise in both of these industries. Although pin fins are often placed in the cooling channels to augment heat transfer, their addition comes at the expense of increased pressure drop. Consequently, the pin fin geometry …
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Economic Analysis of 3D-Printed Ceramic Cores for GasTurbine Investment Castings
… and vanes for gas turbine engines, internal cooling channels are formed by investment casting with sacrificial ceramic cores. The hot injection and pressing techniques traditionally used to manufacture ceramic cores have long lead times and high up-front costs, motivating an interest to form …
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Aerodynamic Force and Pressure Loss Measurements on Low Aspect Ratio Pin Fin Arrays
… turbine inlet temperatures. The use of internal cooling channels fitted with pin fin arrays serves as one method of accomplishing this goal. Consequently, the addition of pin fin arrays comes at the expense of increased pressure drop. Therefore the pin fin geometry must be judiciously chosen to …
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