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Jayawickrama, Thamali Rajika
Publications (2 of 2) Show all publications
Jayawickrama, T. R. (2020). Particle-fluid interactions under heterogeneous reactions. (Licentiate dissertation). Luleå University of Technology
Open this publication in new window or tab >>Particle-fluid interactions under heterogeneous reactions
2020 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Particle-laden flows involve in many energy and industrial processes within a wide scale range. Solid fuel combustion and gasication, drying and catalytic cracking are some of the examples. It is vital to have a better understanding of the phenomena inside the reactors involving in particle-laden flows for process improvements and design. Computational fluid dynamics (CFD) can be a robust tool for these studies with its advantage over experimental methods. The large variation of length scales (101- 10-9 m) and time scales (days-microseconds) is a barrier to execute detailed simulations for large scale reactors. Current state-of-the-art is to use models to bridge the gap between small scales and large scales. Therefore, the accuracy of the models is key to better predictions in large scale simulations.

   Particle-laden flows have complexities due to many reasons. One of the main challenge is to describe how the particle-fluid interaction varies when the particles are reacting. Particle and the fluid interact through mass, momentum and heat exchange. Mass, momentum and heat exchange is presented by the Sherwood number (Sh), drag coefficient (CD) and Nusselt number (Nu) in fluid dynamics. Currently available models do not take into account for the effects of net gas flow generated by heterogeneous chemical reactions. Therefore, the aim of this research is to propose new models for CD and Nu based on the flow and temperature fields estimated by particle-resolved direct numerical simulations (PR-DNS). Models have been developed based on physical interpretation with only one fitting parameter, which is related to the relationship between Reynolds number and the boundary layer thickness. The developed models were compared with the simulation results solving intra-particle flow under char gasification. The drawbacks of models were identied and improvements were proposed.

   The models developed in this work can be used for the better prediction of flow dynamics in large scale simulations in contrast to the classical models which do not consider the effect of heterogeneous reactions. Better predictions will assist the design of industrial processes involving reactive particle-laden flows and make them highly effcient and low energy-intensive.

Place, publisher, year, edition, pages
Luleå University of Technology, 2020
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keywords
Stefan flow, drag coefficient, particle-laden flow, reacting flow
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-77326 (URN)978-91-7790-517-2 (ISBN)978-91-7790-518-9 (ISBN)
Presentation
2020-03-19, E632, Luleå University of Technology, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 2015-05588
Available from: 2020-01-10 Created: 2020-01-09 Last updated: 2020-01-10Bibliographically approved
Jayawickrama, T. R., Haugen, N. E., Babler, M. U., Chishty, M. A. & Umeki, K. (2019). The effect of Stefan flow on the drag coefficient of spherical particles in a gas flow. International Journal of Multiphase Flow, 117, 130-137
Open this publication in new window or tab >>The effect of Stefan flow on the drag coefficient of spherical particles in a gas flow
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2019 (English)In: International Journal of Multiphase Flow, ISSN 0301-9322, E-ISSN 1879-3533, Vol. 117, p. 130-137Article in journal (Refereed) Published
Abstract [en]

Particle laden flows with reactive particles are common in industrial applications. Chemical reactions inside the particle can generate a Stefan flow that affects heat, mass and momentum transfer between the particle and the bulk flow. This study aims at investigating the effect of Stefan flow on the drag coefficient of a spherical particle immersed in a uniform flow under isothermal conditions. Fully resolved simulations were carried out for particle Reynolds numbers ranging from 0.2 to 14 and Stefan flow Reynolds numbers from (-1) to 3, using the immersed boundary method for treating fluid-solid interactions. Results showed that the drag coefficient decreased with an increase of the outward Stefan flow. The main reason was the change in viscous force by the expansion of the boundary layer surrounding the particle. A simple model was developed based on this physical interpretation. With only one fitting parameter, the performance of the model to describe the simulation data were comparable to previous empirical models.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Drag coefficient, Stefan flow, Boundary layer, multiphase reactive flow
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-73836 (URN)10.1016/j.ijmultiphaseflow.2019.04.022 (DOI)000474496000010 ()2-s2.0-85065836366 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-06-11 (oliekm)

Available from: 2019-05-03 Created: 2019-05-03 Last updated: 2019-08-16Bibliographically approved
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