Numerical Study of Turbulent Channel Flow over Surfaces with Variable Spanwise Heterogeneities: Topographically-driven Secondary Flows Affect Outer-layer Similarity of Turbulent Length Scales
Sign Up to like & getrecommendations! Published in 2017 at "Flow, Turbulence and Combustion"
DOI: 10.1007/s10494-017-9839-5
Abstract: Wall-bounded turbulent flows over surfaces with spanwise heterogeneous surface roughness – that is, spanwise-adjacent patches of relatively high and low roughness – exhibit mean flow phenomena entirely different to what would otherwise exist in the… read more here.
Keywords: outer layer; channel; secondary flows; spanwise ... See more keywords
A general alternate loading technique and its applications in the inverse designs of centrifugal and mixed-flow pump impellers
Sign Up to like & getrecommendations! Published in 2020 at "Science China Technological Sciences"
DOI: 10.1007/s11431-020-1687-4
Abstract: For the inverse designs of centrifugal and mixed-flow pump impellers, clarifying the generation process of secondary flows and putting forward corresponding suppression measures is an important approach to improve the impeller performance. In this paper,… read more here.
Keywords: prg; pump; inverse designs; designs centrifugal ... See more keywords
Optimization of a split and recombine micromixer by improved exploitation of secondary flows
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DOI: 10.1016/j.cej.2017.11.131
Abstract: Abstract Flow pattern in two split and recombine (SAR) micromixers were experimentally studied by μ -LIF measurements to validate corresponding CFD simulations. The original design of the investigated micromixer type is based on the repetition… read more here.
Keywords: recombine micromixer; micromixer; optimization split; secondary flows ... See more keywords
Droplet-based flows in serpentine microchannels: Chemical reactions and secondary flows
Sign Up to like & getrecommendations! Published in 2017 at "International Journal of Multiphase Flow"
DOI: 10.1016/j.ijmultiphaseflow.2017.08.010
Abstract: Abstract Mixing is an essential operation in many microfluidic devices. Droplet-based micromixers utilize droplets for mixing enhancement. In the present study, a novel three-dimensional simulation is conducted which has the ability to capture not only… read more here.
Keywords: based flows; rate; droplet based; secondary flows ... See more keywords
Experimental study of secondary flows above rough and flat interfaces in horizontal gas-liquid pipe flow
Sign Up to like & getrecommendations! Published in 2020 at "International Journal of Multiphase Flow"
DOI: 10.1016/j.ijmultiphaseflow.2020.103235
Abstract: Abstract We perform an experimental analysis of stratified, co-current gas-liquid flow in a straight pipe, with the aim of investigating secondary flow structures in the gas-phase. Planar PIV (particle image velocimetry) of the pipe centerline… read more here.
Keywords: gas liquid; secondary flows; secondary flow; pipe ... See more keywords
Effects of heterogeneous surface geometry on secondary flows in turbulent boundary layers
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2019.1014
Abstract: The effect of spanwise heterogeneous surface geometry on turbulent boundary layer secondary flows and on skin friction is investigated experimentally. The surfaces consist of smooth streamwise-aligned ridges of different shapes and widths with spanwise wavelengths… read more here.
Keywords: surface; geometry; turbulent boundary; surface geometry ... See more keywords
Secondary flows in turbulent boundary layers developing over truncated cone surfaces
Sign Up to like & getrecommendations! Published in 2023 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2023.241
Abstract: Abstract The evolution of a turbulent boundary layer over truncated cones in staggered and random configurations is investigated using direct numerical simulations. Three random planform densities and one staggered, which closely match the configuration in… read more here.
Keywords: flows turbulent; random arrangements; momentum pathways; secondary flows ... See more keywords
Vortex generator evaluation models and flow mechanisms for compressor cascade
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DOI: 10.1063/5.0237120
Abstract: In axial compressors, control of the secondary flow is crucial for enhancing aerodynamic performance. Among various control strategies, vortex generators (VGs) are an effective passive method combining simplicity, cost-effectiveness, and reliability. This study investigates the… read more here.
Keywords: stagger angle; vortex generator; generator evaluation; flow mechanisms ... See more keywords
Transport of a solute in primary and secondary flows through a rotating channel with an absorbing wall
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DOI: 10.1063/5.0243098
Abstract: This study uses a multi-scale homogenization technique to provide an analytical solution for solute transport in a viscous fluid flowing between rotating parallel plates. The analytical solutions for the mean and vertical concentration distributions of… read more here.
Keywords: vertical concentration; solute; primary secondary; flow ... See more keywords
Unexpected secondary flows in reverse nonequilibrium shear flow simulations
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review Fluids"
DOI: 10.1103/physrevfluids.4.043905
Abstract: We simulated two particle-based fluid models, namely multiparticle collision dynamics and dissipative particle dynamics, under shear using reverse nonequilibrium simulations (RNES). In cubic periodic simulation boxes, the expected shear flow profile for a Newtonian fluid… read more here.
Keywords: unexpected secondary; secondary flows; shear flow; reverse nonequilibrium ... See more keywords
Development of secondary turbulent circulation in horizontal pipes with local stable density stratification
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DOI: 10.1134/s0018151x17050133
Abstract: Specific features of secondary flows in horizontal heated pipes of a single-phase fluid under high thermal loads are studied. The analysis performed in this work shows that the reasons for the development of secondary flows… read more here.
Keywords: development secondary; secondary turbulent; turbulent circulation; secondary flows ... See more keywords