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 16 of 16 for “"turbulent convection"”.
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The statistical structure of turbulent convection: an experimental study.
Massachusetts Institute of Technology. Dept. of Meteorology. Thesis. 1966. M.S.
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The effect of roughness element thermal conductivity on turbulent convection.
… with surface depositions. Depending on the local convection coefficients, low thermal conductivity deposits may create situations where temperature changes along the heights of the elements are important and must be considered in predicting the overall surface convection coefficient. Using four …
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Turbulent convection from an area source in a confined space
The study of turbulent convection is fundamental to our understanding of many flows that occur in the natural and built environment. This dissertation focusses on the density stratification produced by a turbulent lazy plume that is formed by the release of buoyant fluid from a circular source in a …
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Turbulent convection in an anelastic rotating sphere : a model for the circulation on the giant planets
… compressible gas sphere, driven by internal convection, as a model for the dynamics on the giant planets. We develop a new general circulation model for the Jovian atmosphere, based on the MITgcm dynamical core augmenting the nonhydrostatic model. The grid extends deep into the planet's …
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Turbulent convection in the anelastic rotating sphere : a model for the circulation on the giant planets
… compressible gas sphere, driven by internal convection, as a model for the dynamics on the giant planets. We develop a new general circulation model for the Jovian atmosphere, based on the MITgcm dynamical core augmenting the nonhydrostatic model. The grid extends deep into the planet's …
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Investigation of mean flow and vertical vorticity in turbulent convection using spectral simulations on massively parallel processors
Direct numerical simulations of Rayleigh-Benard convection are performed at several values of Rayleigh number (Ra). The computational domain consists of a square-planform rectangular box with horizontal-to-vertical aspect ratio equal to four. This domain is periodic in the horizontal directions, …
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High Resolution Simulation of Laminar and Transitional Flows in a Mixing Vessel
… action associated with radial impellers under turbulent flow conditions. However, as the Re number decreases, the net radial flow during one impeller revolution was reduced and for the lowest Re number a reciprocating motion with negligible net pumping was observed. In order to elucidate the …
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An Experimental Study of Momentum and Thermal Transport in Flow Through Smooth- and Rough-Wall Microchannels
… roughness in the laminar, transitional and turbulent regimes, though the smooth-wall data are in excellent agreement with macroscale predictions for laminar and turbulent flow. While a shift in the transitional pathway of the thermal transport behavior toward lower Re appears partially …
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Effects of a Heated Turbulent Boundary Layer on Surface Pressure Fluctuations
… of surface pressure fluctuations in a fully turbulent atmospheric boundary layer (ABL) can give information about the velocity field and turbulence. This is of particular importance to the future of wind energy to predict the incoming velocity flow field of wind turbines so as to actively …
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Statistical description of turbulent reacting media
… the interaction of chemistry and turbulence in a turbulent reacting flow. Both self-ignition and flame propagation are studied. For self-ignition study, the combined effects of temperature/concentration inhomogeneities and turbulence were studied numerically. For this purpose two statistic …
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Gas-solid transport and reaction via intervened evaporating sprays
… between the collision-induced diffusion and the turbulent convection of solids, is proposed. Results are partially validated against published experiment data for radial and axial distributions of both solids and gas characteristic properties. Back-flow ratio can be thus predicted quantitatively …
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Convective Dynamics of the Tropical Atmosphere in Three Idealized Approaches
Atmospheric convection organized at large spatial scales significantly influences precipitation patterns and weather events in tropical and subtropical regions, and has a rich, two-way interaction with Earth's climate. Tropical cyclones, mesoscale convective complexes, heat lows, and the rainbands …
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Hydrodynamic and Magnetohydrodynamic Convection in Accretion Disks
The prevalence and consequences of convection perpendicular to the plane of accretion disks have been discussed for several decades. Recent simulations combining convection and the magnetorotational instability have given fresh impetus to the debate, as the interplay of the two processes can …
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Helical waves in Earth's outer core
… the role of wave packets in shaping the turbulent convection, the process of magnetic induction, and maintaining Earth's magnetic field. Our numerical experiments focus on the emission of wave packets from localised sources, on the small length-scales of the convection, which stirs the …
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Scale selection in hydromagnetic dynamos
… is the observed range of motion scales from the convection granules to the cyclic variation of magnetic activity. The Sun’s magnetic field exhibits coherence in space and time on much larger scales than the turbulent convection that ultimately powers the dynamo. Motivated by the scale separation …
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Multiphase Flow Dynamics in Confined Domains—A DNS Study of Bubbly, Thermal and Riblet-Induced Turbulence
… investigation of multiphase and wall-bounded turbulent flows using high-fidelity direct numerical simulations (DNS), with an emphasis on the fundamental mechanisms governing heat transfer, turbulence modulation, and instability-driven transition. By systematically studying three canonical …