TWO-PHASE TURBULENT FLOW IN STRAIGHT HORIZONTAL CHANNELS WITH A SQUARE CROSS-SECTION TAKING INTO ACCOUNT THE INFLUENCE OF VERTICAL FORCES

Saša Milanović, Miloš Jovanović, Živan Spasić, Boban Nikolić

DOI Number
https://doi.org/10.22190/FUWLEP1801019M
First page
019
Last page
034

Abstract


The paper presents a numerical simulation of a two-phase turbulent flow in pneumatic transport through straight horizontal channels with a square cross-section. The transport of solid particles of ash and flour is taken as the two-phase flow, while air is chosen for the transporting fluid. The motion of solid particles occurs due to the aerodynamic forces of the transporting fluid. The paper considers the motion of solid particles by taking into account the influence of vertical forces, which act on the transported solid particles. In flow modelling, the transported solid particles are reduced to spherical shapes. The stress model of turbulence is corrected by taking into account the influence of the induction of secondary flows of the second kind in the gas phase. The full Reynolds stress model is used to model the turbulence, with the application of the complete model for turbulent stresses and turbulent temperature fluxes. The paper presents the results of the numerical grid with the highest resolution above which the increase of the mesh density does not affect the obtained results. The diagrams of the positions of the transported solid particles are provided for cross-sections normal and parallel to the flow direction.

Keywords

pneumatic transport, solid particles, two-phase flow, secondary flow.

Full Text:

PDF

References


Cundall, P.A., Strack, O.D.L., 1979, A discrete numerical model for granular assemblies, Geotechnique, 29(1), pp. 47–65.

Tsuji, Y., Kawaguchi, T., Tanaka, T., 1993, Discrete particle simulation of two-dimensional fluidized bed, Powder Technology, 77(1), pp. 79–87.

Zhao, X.L., Li, S.Q., Liu, G.Q., Yao, Q., Marshall, J.S., 2008, DEM Simulation of the particle dynamics in two-dimensional spouted beds, Powder Technology, 184, pp. 205–213.

Feng, Y.Q., Yu, A.B., Yu, S.J., Yu, A.B., Zulli, P., 2004, Discrete particle simulation of gas fluidization of particle mixtures, AIChE Journal, 50(8), pp. 1713–1728.

Campbell, C.S., Brennen, C.E., 1985, Computer simulations of granular shear flows, Journal of Fluid Mechanics, 151, pp. 167–188.

Hoomans, B.P.B., Kuipers, J.A.M., Briels, W.J., Van Swaaij, W.P.M., 1996, Discrete particle simulation on bubble and slug formation in a two-dimensional gas-fluidised bed: a hard-sphere approach, Chemical Engineering Science, 51(1), pp. 99–118.

Goldschmidt, M.J.V., Kuipers, J.A.M., Van Swaaij, W.P.M., 2001, Hydrodynamic modeling of dense gas-fluidised beds using the kinetic theory of granular flow: effect of coefficient of restitution on bed dynamics, Chemical Engineering Science, 56(2), pp. 571–578.

Li, J., Kuipers, J.A.M., 2003, Gas-particle interactions in dense gas-fluidized beds, Chemical Engineering Science, 58(3–6), pp. 711–718.

He, Y., Van Sint Annaland, M., Deen, N.G., Kuipers, J.A.M., 2006, Gas-solid two-phase turbulent flow in acirculating fluidized bed riser: an experimental and numerical study, Proceedings of the Fifth Word Congress on Technology, Orlando, FL, USA, pp. 1–9.

Tanaka, T., Yonemura, S., Kiribayashi, K., Tsuji, Y., 1996, Cluster formation and particle-induced instability in gas–solid flows predicted by the DSMC method, International Journal of JSME, 39, pp. 239–245.

Fuzhen, C., Hongfu, Q., Han, Z., Weiran G.A., 2017, Coupled SDPH-FVM method for gas-particle multiphase flow: Methodology, International Journal for Numerical Methods in Engineering, 109(1), pp.73-101.

Jaffari, M., Mansouri, Z., Awal, M. Saffar, 2014, Modelling and numerical investigation of erosion rate for turbulent two-phase gas solid flow in horizontal pipes, Powder technology, 267, pp. 362–370.

Lain, S., 2013, Study of turbulent two-phase gas-solid flow in horizontal channels, Indian Journal of Chemical Technology, 20(2) pp. 128-136.

Schellander, D., Schneiderbauer, S., Pirker, S., 2013, Numerical study of dilute and dense poly-dispersed gas-solid two-phase flows using an Eulerian-Lagrangian hybrid model, Chemical Engineering Science, 95, pp. 107-118.

Zhou Hao, Mo Guiyuan, Cen Kefa, 2011, Numerical investigation of dispersed Gas-Solid two-phase flow around a circular cylinder using Latuce-Boltzman method, Computers & Fluids, 52, pp.130-138.

Launder, B.E., Yong, W.M., 1972, Secundary flow in ducts of squere cross-section, Journal of Fluid Mechanics, 54, pp. 289-295.

Hanjalić, K., Launder, B.E., 1972, Fully-developed asymmetric turbulent flow in a plane channel, Journal of Fluid Mechanics, 51(2), p301.

Loicinski, L.G., 1970, Mehanics of fluid and gasis, (in Russian), Nauka, Moscow.

Bird, B.R., Steward, E.W., Lightfoot, N.E., 2001, Transport Phenomena, New York, Springer, USA.

Hinze, J.O., 1959, Turbulence, McGraw-Hil, New York.

Stevanović, Ž., 2008, Numerical aspects of turbulent impulse and heat transfer, (in Serbian), Faculty of Mechanical Engineering, University of Niš, Niš.

Patankar, S.V., 1980, Numerical heat transfer and fluid flow, Hemisphere Publishing Corporation, USA.

Milanović, S., Jovanović, M., Nikolić, B., Blagojević, V., 2016, The influence of secondary flow in a two-phase gas-solid system in straight channels with a non-circular cross-section, Thermal Science, 20(5), pp. S1419-S1434.

Hanjalić, K., 1976, General equations of transport processes, (in Serbian), Faculty of Mechanical Engineering, University of Sarajevo, Sarajevo.

Milanović, S., 2014, Research into the turbulent two-phase flow in straight channels with a non-circular cross-section during the pneumatic transport of granular materials, (in Serbian), PhD Thesis, Faculty of Mechanical Engineering, University of Niš, Niš.




DOI: https://doi.org/10.22190/FUWLEP1801019M

Refbacks

  • There are currently no refbacks.


ISSN   0354-804X (Print)

ISSN   2406-0534 (Online)