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Showing 1 to 8 of 8 for “"relaminarization"”.
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Transition to turbulence and relaminarization of pulsatile pipe flows
<p>The instability and transition to turbulence and its evolution in pulsatile pipe flows involving both, reverse and no-reverse flows, is the primary focus of this experimental work. A piston driven by a programable DC servo motor was used to set up a water flow system and provide the pulsation …
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Air Ingress and Heat-Driven Flow Relaminarization in a Very High Temperature Reactor (VHTR)
… studied is the issue of heat-driven flow relaminarization (forced convection), in which a strongly heated turbulent gas flow, exhibits heat transfer characteristics of laminar flows in the downstream part. As the gas is heated, a reduction in the gas density causes the bulk flow to …
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Characterization of the Mechanism of Drag Reduction Using a Karhunen-Loève Analysis on a Direct Numerical Simulation of Turbulent Pipe Flow
… at Re = 95. This chugging motion is the relaminarization of the flow, resulting in an increased flow rate, and then before complete relaminarization, the flow regains its turbulent state. This occurs because the lift modes, which are responsible for the majority of the energy in the …
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Magnetohydrodynamic Heat Transfer for Fusion Energy
… high enough Hartmann numbers for partial flow relaminarization in the experiment. The flow loop allows for qualitative characterization of behavior in regions of steep magnetic field gradients and transitional flows . This thesis uses existing liquid metal literature data to develop a new form …
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The Effect of Persistent Vortices on Boundary Layer Behavior in Turbulent Flow along a Kelvin-Stuart Cat's Eyes Wavy Wall
… that using the cat's eyes wavy wall gives better relaminarization properties than the von Karman shaped wavy wall, which can have many real world applications.
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Turbulent Boundary Layer Flow Over a Bump
… gradients tend to suppress turbulence and induce relaminarization-like effects, while adverse gradients promote stronger turbulence and signs of separation. In regions with significant three-dimensionality, the boundary layer separates into distinct inner and outer zones, with misalignment in …
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Theoretical and Computational Analyses on Transition and Turbulence in Purely Oscillating Pipe Flow
… transition stage at which the turbulence and relaminarization phenomena first emerge is detected from the high-amplitude velocity fluctuations. The turbulence intensity increases with the Stokes number proportional to oscillation frequency. Furthermore, surface roughness constructed utilizing …
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Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles
… the conditions could sustain turbulence, or relaminarization, implying the conditions could not. Fully turbulent fields relaminarized subject to conditions 4.134 m and 3.199 m leeward of the stagnation point. However, different initial conditions produced long-lived fluctuations at leeward …