AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Aerodynamic Chracteristics of Fugitive Dusts by the Types of Animal Feed Stuffs Duing Gravitational Settle Down
Hak-Joon Kim, Bangwoo Han, YONG-JIN KIM, Korea Institute of Machinery and Materials
Abstract Number: 253 Working Group: Remote and Regional Atmospheric Aerosols
Abstract During gravitational settle down of the five types of animal feed stuff (Wheat Bran Pellets, Palm Kernel Expellers, Corn Gluten Feeds, Soy Been Meals, Copras), which are the crucial sources to generate fugitive dusts near the port of In-cheon, Korea, the aerodynamic characteristics of the feed stuffs were analyzed. 1.0 g of each feed stuff powder was dispersed in the closed chamber, 30 cubic meters, and the changes in the concentration of the airborne particle in the chamber based on particle volume and number were monitored using two optical particle counters and a SMPS for micro-meter and nano-meter particles, respectively. The experimental results show that the decay constants of the five types of dusts by gravitational settling were linearly proportional to the square of the size of the airborne dusts. In addition, the decay constant of 0.3 µm particles by the gravitational settle was seven times smaller than that of 5.5 µm particles for WBP, and fifteen times for PKE and CGF, respectively. In particular, the decay of the SBM was fastest, and those of COP and WBP, CGF, and PKE were followed, and this order of the decay constants by the types was dependent of the density of the stuffs. These results indicate that when they aerosolized during load and unload of the feed stuffs, the aerodynamic properties of the animal feed stuffs were dependent on the density and size of the dusts.