Author
H. Wu
Bio: H. Wu is an academic researcher from University of Arizona. The author has contributed to research in topics: Dissipation & K-epsilon turbulence model. The author has an hindex of 2, co-authored 2 publications receiving 482 citations.
Papers
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TL;DR: In this paper, the authors measured turbulence parameters in a baffled, Rushton turbine agitated vessel with a laser-Doppler velocimeter, and the necessary corrections for the periodic, nondissipative velocity fluctuations in the near impeller region were made by an autocorrelation method.
464 citations
TL;DR: In this article, an autocorrelation method was used to measure the turbulence energy dissipation rate in mixers by using of laser-Doppler measurements of the velocity auto-correlation and turbulence energy.
Abstract: An approximate method of measuring the turbulence energy dissipation rate (ɛ) in mixers by use of laser-Doppler measurements of the velocity autocorrelation and turbulence energy was successful in yielding remarkably consistent values. The necessary corrections for periodic, non-dissipative velocity fluctuations were made by an autocorrelation method. Two modes of periodic fluctuation were found to be significant. Transformation of the corrected autocorrelations yielded completely normal turbulence energy spectra.
44 citations
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TL;DR: In this paper, large eddy simulations were performed on the flow in a baffled stirred tank, drien by a Rushton turbine at Res 29,000, using a lattice Boltzmann scheme for discretizing the Naier ) Stokes equations, and a force-field technique for representing the action of the impeller on the fluid.
Abstract: Large eddy simulations were performed on the flow in a baffled stirred tank, drien by a Rushton turbine at Res 29,000. The simulation procedure consisted of a lattice ) Boltzmann scheme for discretizing the Naier ) Stokes equations, and a force- field technique for representing the action of the impeller on the fluid. The subgrid-scale model was a conentional Smagorinsky model with a Smagorinsky constant c s 0.12. s The uniform, cubic computational grid had a size of about 6 = 10 6 nodes. The com- puter code was implemented on a parallel, shared-memory computer platform. The results on the phase-resoled aerage flow, as well as on the turbulence characteristics, are compared with phase-resoled experimental data. The trailingortex structure in the ¤icinity of the impeller was well represented by the simulations.
322 citations
TL;DR: In this paper, a large eddy particle image velocimetry (PIV) method was proposed to estimate the dissipation rate along the center plane of a stirred vessel with an axial 45° pitched-blade turbine.
272 citations
TL;DR: In this paper, the operating conditions of the iodide-iodate reaction system used to quantify micromixing phenomena in chemical reactors and mixers are described in a very practicable way.
252 citations
TL;DR: In this paper, the effect of the modeling approach, discretization scheme and turbulence model on mean velocities, turbulent kinetic energy and global quantities, such as the power and circulation numbers, has been investigated.
235 citations
TL;DR: In this paper, the mean drop size of liquid-liquid dispersions was found to be better correlated with the maximum turbulence energy dissipation rate than to either the average power input per unit mass of fluids, or the tip speed of the impeller.
222 citations