Effect of Pressure-Velocity Correlation on Turbulence Modification in a Bubbly Pipe Flow

This investigation deals with the study on the processes involved in the phenomenon about turbulence modification in dilute gas-particle turbulent flows. The proposed model, along with other selected turbulence modification models from the literature, is used to simulate a particle-laden vertical pipe flow. The simulation results show that the new model provides improved predictions of the experimental data.

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The Turbulence Modification in Bubbly Vertical Pipe Flow : Effect of Local Void Fraction and Bubble Diameter

Proceedings of thermal engineering conference ◽

10.1299/jsmeptec.2002.0_241 ◽

2002 ◽

Vol 2002 (0) ◽

pp. 241-242

Author(s):

Daiju MINATO ◽

Tomohiko TANAKA ◽

Akiko FUJIWARA ◽

Koichi HISHIDA ◽

Masanobu MAEDA

Keyword(s):

Void Fraction ◽

Pipe Flow ◽

Bubble Diameter ◽

Vertical Pipe ◽

Flow Effect ◽

Turbulence Modification

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Turbulence Modification in Bubbly Vertical Pipe Flow : Extraction of microscopic turbulent structure by time-series high time resolution PIV

The Proceedings of the Thermal Engineering Conference ◽

10.1299/jsmeted.2003.71 ◽

2003 ◽

Vol 2003 (0) ◽

pp. 71-72

Author(s):

Daiju MINATO ◽

Tomohiko TANAKA ◽

Yohei SATO ◽

Koichi HISHIDA

Keyword(s):

Time Series ◽

Time Resolution ◽

Pipe Flow ◽

Turbulent Structure ◽

High Time ◽

High Time Resolution ◽

Vertical Pipe ◽

Turbulence Modification

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Modeling of Turbulence Modification Using Two-Time-Scale Dissipation Models and Accounting for the Particle Wake Effect

Volume 1: Fora, Parts A, B, C, and D ◽

10.1115/fedsm2003-45749 ◽

2003 ◽

Author(s):

Y. Yu ◽

L. X. Zhou

Keyword(s):

Time Scale ◽

Finite Size ◽

Turbulence Models ◽

Turbulent Fluctuation ◽

Wake Effect ◽

Velocity Correlation ◽

Two Phase ◽

Turbulence Modification ◽

Particle Flows ◽

Dissipation Model

The presently developed two-phase turbulence models under-predict the gas turbulent fluctuation, because their turbulence modification models cannot totally reflect the effect of particles. In this paper, a two-time-scale dissipation model of turbulence modification, including a two-time-scale dissipation model for the two-phase velocity correlation and a two-time-scale dissipation model for the dissipation rate of gas turbulent kinetic energy, is proposed and used to simulate swirling gas-particle flows with a swirl number of 0.47. Besides, a gas turbulence augmentation model accounting for the finite-size particle wake effect in the gas Reynolds stress equation is proposed. The proposed turbulence modification models are used to simulate two-phase pipe flows. It can predict not only the turbulence reduction by small particles but also the turbulence enhancement by large particles.

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