%0 Journal Article
%T Effects of Nonuniform Outflow and Buoyancy on Drag Coefficient Acting on a Spherical Particle
%A Mariko Watanabe
%A Joji Yahagi
%J Journal of Flow Control, Measurement & Visualization
%P 99-110
%@ 2329-3330
%D 2017
%I Scientific Research Publishing
%R 10.4236/jfcmv.2017.54008
%X Pyrolysis gas jets out from the surface of a solid fuel particle when heated. This study experimentally observes the occurrence of gas jets</span><span style=\"font-family:Verdana;\">&nbsp;</span><span style=\"font-family:&quot;\"><span style=\"font-family:Verdana;\">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,&nbsp;</span><i><span style=\"font-family:Verdana;\">i.e.</span></i><span style=\"font-family:Verdana;\">, 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.
%K Drag Force
%K Particle
%K Nonuniform Outflow
%K Heat
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=79699