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- W3166180978 abstract "This work presents a numerical investigation of a confined thermal plume under the influence of gas radiation. Plumeflow is generated by a linear heat source of constant power density immersed in a cubic cavity. The main aim of this thesis is to characterize the evolution of the plume throughout its transition from steady-state to turbulent regime, and to explore the gas radiation effects on flow stability, heat transfers, thermal and kinetic fields of the plume. DNS numerical simulations are performed over a Rayleigh number range from 106 to 109 by applying a finite volume CFD software coupled to a module for radiative heat transfer calculations. The pure convective situation is studied first to characterize the thermal and kinetic fields of the plume in different flow regimes. Next, the convection-radiation coupling is introduced by considering either gray gas or real gas (air - H2O mixture) media. The effects of optical thickness are analyzed in details for gray gas model. Results show that gas radiation stabilizes the plume flow and delays the onset of unsteadiness. Gas radiation also homogenizes the thermal field and reduces its spatial spreading. However, radiation effect on the kinetic field depends on the flow state. For steady state, gas radiation decreases the global flow circulation while for transient and turbulent states, it enhances the flow dynamics in optically thin medium.These general trends of radiation are also confirmed in real gas mixture through a parametric study of water vapor concentration and reference temperature." @default.
- W3166180978 created "2021-06-22" @default.
- W3166180978 creator A5021291386 @default.
- W3166180978 date "2020-02-24" @default.
- W3166180978 modified "2023-09-27" @default.
- W3166180978 title "Numerical study of a confined thermal plume at different flow regimes under the influence of gas radiation" @default.
- W3166180978 hasPublicationYear "2020" @default.
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