A Numerical Study on the Oscillating Flow Induced by an Acoustic Field around Coal ParticlesReport as inadecuate




A Numerical Study on the Oscillating Flow Induced by an Acoustic Field around Coal Particles - Download this document for free, or read online. Document in PDF available to download.

Journal of Combustion - Volume 2016 2016, Article ID 8306839, 13 pages -

Research Article

North China Electric Power University, Baoding 071003, China

North China Electric Power University, Beijing 102206, China

Received 25 May 2016; Accepted 26 July 2016

Academic Editor: Xiang Wang

Copyright © 2016 Genshan Jiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In order to investigate the acoustically driven oscillating flow around coal particles in the power plant boiler, the two-dimensional, unsteady mass and momentum conservation equations for laminar flow in spherical coordinates are developed numerically. The velocity field, axial pressure gradient, shear stress, and flow separation angle on the particle surface are carefully analyzed with different values of acoustic Reynolds number and Strouhal number. The minimum frequency required for flow separation is also investigated with different SPL sound pressure level. The axial pressure gradient, shear stress, and separation angle on the surface are proportional to the magnitude of the oscillating flow velocity at low frequency ~50 Hz. However, those physical quantities have different values at high frequency ~5000 Hz, due to the combined effect of curvature and the flow acceleration.





Author: Genshan Jiang, Weilong Xu, Yuechao Liu, Yapan Wu, and Qian Kong

Source: https://www.hindawi.com/



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