Global ETD Search
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Showing 1 to 8 of 8 for “"Frictional drag"”.
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Experiments in turbulent soap-film flows: Marangoni shocks, frictional drag, and energy spectra
… unprecedented experimental measurements of the frictional drag in turbulent soap-film flows over smooth walls. These flows are effectively two-dimensional, and we are able to create soap-film flows with the two types of turbulent spectrum that are theoretically possible in two dimensions: the …
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Polymers and plastrons : active and passive drag reduction in wall-bounded turbulent flows
Frictional energy dissipation in wall-bounded turbulence is ubiquitous in modern engineering systems, ranging from the flow of liquids through pipelines, to the drag-inducing boundary layer around ships and submarines. The effective mitigation of this frictional drag is therefore of great practical …
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A suction-based reversible attachment and locomotion mechanism for an underway vessel hull cleaning and inspection robot
… with it, the most notable being a hull frictional drag increase, which significantly increases the annual fuel and maintenance costs of these vessels. To mitigate these risks and costs, merchant vessels such as cargo tankers undergo a thorough cleaning in a dry-dock up to twice every …
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The laminar boundary layer on spinning bodies of revolution
… temperature profiles, displacement thickness and frictional drag and moment coefficients are presented for each geometry over a wide range of spin rates.
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A study of gas-solids flows at very high speed
… are that provided an estimation of the frictional drag due to the gas skin friction and the solids particle to particle and particle to duct wall interaction can be obtained, the numerical solution gives good results. The constant fractional lag theory gives indications of providing a …
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Turbulence models for the numerical prediction of transitional flows with RANSE
… on the prediction of the friction and pressure drag components as well as lift predictions. In particular, the capability of the turbulent models to capture the transition between laminar and turbulent regime plays a vital role in engineering applications. Four different turbulence models are …
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The dynamics of bottom boundary currents in the ocean
… indicate that bottom stresses dominate the frictional drag on the dense fluid layer in the vicinity of the source whereas relatively weak entrainment slowly modulates the flow properties in the downstream region. The combined influence of entrainment and ambient stratification help limit the …
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Geometry mediated drag reduction using riblets and wrinkled surface textures
… such as skin friction. Inspired by the drag reducing ability of these natural structures, especially the ribbed features on shark denticles, passive drag reduction strategies such as micro-fabricated riblet surfaces have been developed and studied. Microgroove textures on the surface of …