Effects of Nonuniform Outflow and Buoyancy on Drag Coefficient Acting on a Spherical Particle - Journal of Flow Control, Measurement & Visualization

JFCMV > Vol.5 No.4, October 2017

Journal of Flow Control, Measurement & Visualization

Volume 5, Issue 4 (October 2017)

ISSN Print: 2329-3322 ISSN Online: 2329-3330

Effects of Nonuniform Outflow and Buoyancy on Drag Coefficient Acting on a Spherical Particle ()

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Download as PDF (Size: 962KB) PP. 99-110

DOI: 10.4236/jfcmv.2017.54008 1,002 Downloads 1,920 Views Citations

Author(s)

Mariko Watanabe, Joji Yahagi

Affiliation(s)

Faculty of Science and Technology, Sophia University, Tokyo, Japan.

ABSTRACT

Pyrolysis gas jets out from the surface of a solid fuel particle when heated. This study experimentally observes the occurrence of gas jets from heated solid fuel particles. Results reveal a local gas jet occurs from the particle’s surface when its temperature reaches the point at which a pyrolysis reaction occurs. To investigate the influence of the gas jet on particle motion, a numerical simulation of the uniform flow around a spherical particle with a nonuniform outflow or high surface temperature is conducted, and the drag force acting on the spherical particle is estimated. In the numerical study, the magnitude of the outflow velocity, direction of outflow, and Rayleigh number, i.e., particle surface temperature, are altered, and outflow velocities and the Rayleigh number are set based on the experiment. The drag coefficient is found to decrease when an outflow occurs in the direction against the mainstream; this drag coefficient at a higher Rayleigh number is slightly higher than that at a Rayleigh number of zero.

KEYWORDS

Drag Force, Particle, Nonuniform Outflow, Heat

Share and Cite:

Watanabe, M. and Yahagi, J. (2017) Effects of Nonuniform Outflow and Buoyancy on Drag Coefficient Acting on a Spherical Particle. Journal of Flow Control, Measurement & Visualization, 5, 99-110. doi: 10.4236/jfcmv.2017.54008.

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