Effects of specularity and particle-particle restitution coefficients on the recirculation characteristics of dispersed gas-particle flows through a sudden expansion |
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Authors: | Subrat Kotoky Amaresh Dalal Ganesh Natarajan |
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Affiliation: | Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India |
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Abstract: | We numerically investigate the effects of restitution and specularity coefficients on the characteristics of dispersed gas-particle flows through a sudden expansion. The studies are carried out using an indigenous finite volume flow solver in a collocated framework with two-fluid model. Parametric studies are performed to gain insights into the differences in recirculation patterns that arise due to variations in restitution and specularity coefficients. The simulations show that particle-particle interactions, quantified by restitution coefficient (e) have a greater impact on recirculation characteristics than particle-wall interactions, which are quantified by specularity coefficient (). Studies reveal that the recirculation lengths tend to decrease as particle collisions become more elastic (as e tends to unity) while they increase, as the value of increases. However, the changes in recirculation length are very gradual and less pronounced when only particle-wall interactions are considered as compared to particle-particle interactions. From the range of parametric variations studied in this work, the maximum recirculation length has been found when the value of is maximum and that of e is minimum. |
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Keywords: | Specularity coefficient Particle-particle restitution coefficient Recirculation length KTGF model Eulerian-Eulerian two-fluid model |
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