Inter-phase interaction in a turbulent, vertical channel flow laden with heavy particles. Part II: Two-phase velocity statistical properties

Wang, Bing

doi:10.1016/j.ijheatmasstransfer.2010.01.027

Cited by 27 publications

(4 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The study by Gore and Crowe [8] found that a particle diameter of 1/10 the size of the most energetic eddies represents a demarcation between increase and decrease of the carrier-phase turbulence such that smaller particles tended to attenuate the turbulence. The interaction between two phases was studied by Wang [9,10] using numerical simulation of a turbulent channel flow laden with heavy particles. They found that the modulation of turbulence is stronger near the wall than in other regions due to the preferential accumulation of particles near the wall.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

et al. 2017

View full text Add to dashboard Cite

The dynamic and thermal performance of particleladen turbulent flow is investigated via direction numerical simulation combined with the Lagrangian point-particle tracking under the condition of two-way coupling, with a focus on the contributions of particle feedback effect to momentum and heat transfer of turbulence. We take into account the effects of particles on flow drag and Nusselt number and explore the possibility of drag reduction in conjunction with heat transfer enhancement in particle-laden turbulent flows. The effects of particles on momentum and heat transfer are analyzed, and the possibility of drag reduction in conjunction with heat transfer enhancement for the prototypical case of particle-laden turbulent channel flows is addressed. We present results of turbulence modification and heat transfer in turbulent particle-laden channel flow, which shows the heat transfer reduction when large inertial particles with low specific heat capacity are added to the flow. However, we also found an enhancement of the heat transfer and a small reduction of the flow drag when particles with high specific heat capacity are involved. The present results show that particles, which are active agents, interact not only with the velocity field, but also the temperature field and can cause a dissimilarity in momentum and heat transport. This demonstrates that the possibility to increase heat transfer and B Yuhong Dong suppress friction drag can be achieved with addition of particles with different thermal properties.

show abstract

Section: Introductionmentioning

confidence: 99%

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

et al. 2017

View full text Add to dashboard Cite

show abstract

“…To verify the numerical simulation methods, the present calculated results are compared with the experimental data by Kulick et al [23] and numerical data by Kim et al [24], Rouson and Eaton [25], Wang and Squires [16], and Wang [26,27]. Figure 2 shows the mean streamwise velocities of Mean streamwise velocities of fluid and particle phases.…”

Section: Resultsmentioning

confidence: 86%

Analysis of solid particle clusters in coherent structures of turbulent channel flow

Wang

Zhang

et al. 2013

Sci. China Technol. Sci.

Self Cite

View full text Add to dashboard Cite

A particle-laden turbulent channel flow is investigated to study particle clusters in large-scale turbulent coherent structures. The fluid phase is calculated by large eddy simulation and particles are tracked using Lagrangian trajectory method. The flow Reynolds number is 180 based on the friction velocity and half-width of the channel. The particle is lycopodium with St=0.93 which may well follow the fluid phase. The mean and fluctuating velocities of both two phases are obtained, which are in good agreement with previous data. The strongest accumulations of particles in low-speed streak structures are observed at y + =11.3. Moreover, once particles are captured in low-speed streaks, most of them will reside there for a long period. Particles clustered in low-speed streaks obtain smaller instantaneous wall-normal and spanwise velocities than those out of there, which induce a larger particle flux into low-speed streaks than that out of there. The study is important for understanding particle dispersion mechanisms in gas-particle turbulent channel flows. particle cluster, preferential concentration, low-speed streak, coherent structure, large eddy simulation, Lagrangion trajectory method Citation:Lu H, Wang B, Zhang H Q, et al. Analysis of solid particle clusters in coherent structures of turbulent channel flow. Sci China Tech

show abstract

“…This indicates that the turbulent airflow is well resolved by the present numerical methods and codes. Moreover, the statistical mean and fluctuating velocity profiles of particles are also compared with previous DNS and LES data reported by Wang and Squires [26] and Wang, [31,32] as shown in Figs. 2(c)-2(f).…”

Section: Numerical Simulation Verificationmentioning

confidence: 81%

Particle transport behavior in air channel flow with multi-group Lagrangian tracking

Zhao

Zhang

et al. 2017

Chinese Phys. B

Self Cite

View full text Add to dashboard Cite

The particle motions of dispersion and transport in air channel flow are investigated using a large eddy simulation (LES) and Lagrangian trajectory method. The mean and fluctuating velocities of the fluids and particles are obtained, and the results are in good agreement with the data in the literature. Particle clustering is observed in the near-wall and low-speed regions. To reveal the evolution process and mechanism of particle dispersion and transport in the turbulent boundary layer, a multi-group Lagrangian tracking is applied when the two-phase flow has become fully developed: the fluid fields are classified into four sub-regions based on the flow characteristics, and particles in the turbulent region are divided accordingly into four groups when the gas-particle flow is fully developed. The spatiotemporal transport of the four groups of particles is then tracked and analyzed. The detailed relationship between particle dispersion and turbulent motion is investigated and discussed.

show abstract

Inter-phase interaction in a turbulent, vertical channel flow laden with heavy particles. Part II: Two-phase velocity statistical properties

Cited by 27 publications

References 36 publications

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

Analysis of solid particle clusters in coherent structures of turbulent channel flow

Particle transport behavior in air channel flow with multi-group Lagrangian tracking

Contact Info

Product

Resources

About