New calculations of the spreading of particles being carried down a pipe by a fluid show that the effect of the pipe shape—round versus rectangular—is more dramatic than researchers previously thought. The particles spread out asymmetrically in a rectangular pipe, whereas they form a symmetric distribution in both circular and elliptical pipes.
Experimentalists often study these processes by injecting a blob of dye into a flow and observing how it spreads over time. Compared to the average flow speed, some dye particles will move faster, whereas others will lag behind. Researchers have determined the distribution of dye for the two simplest cases—a circular pipe and a wide, flat channel—and found that the spread along the flow direction (upstream-downstream) is symmetrical for the circular pipe but not for the channel.
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