Flushing can spew a jet with toilet water particles up to 5 feet above the bowl in seconds.
, enabling us to image and measure the location and motion of spreading aerosol plumes from flushing commercial toilets in vivid detail.John Crimaldi/Scientific Reports, CC BY-NC-NDToilets are designed to efficiently empty the contents inside the bowl through a downward motion into the drain pipe. In the flush cycle, water comes into forceful contact with the contents inside the bowl and creates a fine spray of particles suspended in air.
We found that a typical commercial toilet generates a strong upward jet of air with velocities exceeding 6.6 feet per second , rapidly carrying these particles up to 5 feet above the bowl within eight seconds of the start of the flush.flushometer-style valve found throughout North America in our lab. Flushometer valves use pressure instead of gravity to direct water into the bowl. We used special optics to create a thin vertical sheet of laser light that illuminated the region from the top of the bowl to the ceiling. After flushing the toilet with a remote electrical trigger, the aerosol particles scatter enough laser light to become visible, allowing us to use cameras to image the plume of particles.
Even though we expected to see these particles, we were still surprised by the strength of the jet ejecting the particles from the bowl. used a computational model of an idealized toilet to predict the formation of aerosol plumes, with an upward transport of particles at speeds above the bowl approaching 3.3 feet per second , which is about half of what we observed with a real toilet.
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