Abstract
Since 1980, TOTO has developed water jet technology of washletR washing human private body parts. Main stream of these developments has been conserving water. Recently we have developed a new fluid device which can reduce water 600ml/min to 430ml/min while wash feeling is remained. This fluid device uses a difference of density between water and air. Device has an orifice for fast main flow and a small room in downstream of orifice. In the small room, water and air make two different modes; one decelerates velocity of main flow, and another keeps it unchanged. Periodic two modes induce a phenomenon that fast flow catches up with slow flow until getting to human body and grows a large water cluster. A feeling of these large clusters is stronger than normal, constant flow because forming large clusters means that kinetic energy of water is concentrated and human body tend to feel an instant, large impulse.
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