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http://hdl.handle.net/10397/106438
Title: | Vortex-dynamical interpretation of anti-phase and in-phase flickering of dual buoyant diffusion flames | Authors: | Yang, T Xia, X Zhang, P |
Issue Date: | May-2019 | Source: | Physical review fluids, May 2019, v. 4, no. 5, 053202, p. 053202-1 - 053202-23 | Abstract: | Anti-phase and in-phase flickering modes of dual buoyant diffusion flames were numerically investigated and theoretically analyzed in this study. Inspired by the flickering mechanism of a single buoyant diffusion flame, for which the deformation, stretching, or even pinch-off of the flame surface result from the formation and evolution of the toroidal vortices, we attempted to understand the anti-phase and in-phase flickering of dual buoyant diffusion flames from the perspective of vortex dynamics. The interaction between the inner-side shear layers of the two flames was identified to be responsible for the different flickering modes. Specifically, the transition between anti-phase and in-phase flickering modes can be predicted by a unified regime nomogram of the normalized flickering frequency versus a characteristic Reynolds number, which accounts for the viscous effect on vorticity diffusion between the two inner-side shear layers. Physically, the transition of the vortical structures from symmetric (in-phase) to staggered (anti-phase) in a dual-flame system can be interpreted as being similar to the mechanism causing flow transition in the wake of a bluff body and forming the Karman vortex street. | Publisher: | American Physical Society | Journal: | Physical review fluids | EISSN: | 2469-990X | DOI: | 10.1103/PhysRevFluids.4.053202 | Rights: | ©2019 American Physical Society The following publication Yang, T., Xia, X., & Zhang, P. (2019). Vortex-dynamical interpretation of anti-phase and in-phase flickering of dual buoyant diffusion flames. Physical review fluids, 4(5), 053202 is available at https://doi.org/10.1103/PhysRevFluids.4.053202. |
Appears in Collections: | Journal/Magazine Article |
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PhysRevFluids.4.053202.pdf | 6.25 MB | Adobe PDF | View/Open |
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