Ye-Mon Chen

ON THE FLOW OF GRANULAR MATERIAL IN A MODEL BLAST FURNACE

Abstract Experimental studies on the flow of granular material in a 1/10th-scale model blast furnace of a commercial unit were conducted. The velocity distribution of the particulate flow, wall stresses, and the shape of the dead-man formation at the bottom of the furnace were measured. It was found that the particulate material is in an active state in the upper portion of the furnace (above the belly) and a passive state in the lower portion (below the belly). Consequently, the behavior of the particulate flow, wall stresses and dead-man formation can be reasonably described according to the aforementioned failure states.

An experimental investigation of particle size analysis by a modified andreasen pipet

Abstract The Andreasen pipet is very commonly used for particle size analysis; however, due to its improper method of vertical sampling, a powder sample with a logarithmic-normal distribution cannot be reproduced by the pipet method. The induced error is rather serious, particularly for the range of smaller particles. Instead of vertical sampling, the present experiment introduces the modification of a stem of tubing extending from the bottom of the vessel to form a sampling slot. Two powder samples are tested and analysis by a micron photo sizer is chosen as the standard for comparison. The results show that powder samples with logarithmic-normal distributions are very well reproduced, and the analysis by the modified pipet is almost as good as that by the photo sizer.