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Study on recycling of waste water from spent water-soluble coolant
Kazuya Takada,Yasuo Kondo,Kenji Yamaguchi,Satoshi Sakamoto 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1
We propose a recycling system that can recover the useful water from the spent water soluble coolant by using a surfactant and powdered activated carbon. The processing of about 70 liters of actual spent water soluble coolant yielded about 60 liters of clear water with 6.7 of pH and 0.0 of Brix value. About 120 liters of recycle water-soluble coolant was prepared by diluting an emulsion type cutting fluid 20 times with the recycle water. The recycle coolant has been showing the very similar Brix value and pH changes as those of virgin coolant until 100 days usage. The recycle coolant also showed the same potential to inhibit the progress of flank wear as that of virgin coolant. These facts indicate that the recycled water can be utilized as a dilutor of renewal water-soluble coolant.
Koji Miyaji,Taku Uchiyama,Kazuya Yamaguchi 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
A Balloon-based Operation Vehicle (BOV), which has been successfully developed at JAXA in the past two years for a new micro-gravity experimental method, is aiming a next stage of being a flying test bed of an air-breathing engine (pre-cooled turbojet engine) planed in 2008. In this paper, the aerodynamic characteristics of BOV obtained by CFD simulations are compared with wind tunnel experiments in 2005-2006. In addition, the latest experimental results for a new configuration with a main wing for a level flight are also presented.