@article{oai:ir.kagoshima-u.ac.jp:00002219,
 author = {NOZAKI, Tsutomu and 野﨑, 勉 and FUKUHARA, Minoru and 福原, 稔 and SHII, Yasuyuki and 椎, 保幸 and KAMURA, Takumi and 嘉村, 拓実 and OHYAMA, Kenji and 大山, 謙二},
 journal = {鹿児島大学工学部研究報告, The research reports of the Faculty of Engineering, Kagoshima University},
 month = {Sep},
 note = {In the case of collecting the granular grains and removing the muddy deposits, it was found to be very difficult to lift them up effectively only by use of suction force. We also found from our investigations that a proposed sand collecting system with an injection at the collecting mouth can
transport such materials more effectively and more smoothly than other conventional systems by means of the fluidization of the settled bed before collecting the solid particles. In this paper, the effects of the inner diameter ratio of the injection mouth to the suction mouth on the concentration
of the muddy deposits are discussed using volcanic ash as a collecting material, both in the case of the inner diameter of the suction mouth kept constant, and in the case of that of the injection mouth kept constant. It was found from the experimental results that the performance of the collecting unit depends greatly upon the injection velocity, so the greater the injection velocity, the larger the concentration of the ash.},
 pages = {21--27},
 title = {Fundamental Study of a Pit Sweeper for Collecting the Muddy Deposits Especially Containing the Volcanic Ashes (Effects of Diameter Ratio of Injection to Suction on Concentration)},
 volume = {35},
 year = {1993}
}