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To ensure that the tracer faithfully follows the undisturbed flow field, the density ofthe tracer must match that of the experimental fluid. For example, consider a waterchannel experiment. Most dyes are heavier than water and must be mixed withtemperature will not be neutrally buoyant if the tank is refilled with fresh colderwater. Finally, you will note that in most of the examples given below a blue dye isDye Injection Examples. Image from http://www.eng.nus.edu.sg/mpelimtt/Karman1.JPG http://www.eng.nus.edu.sg/mpelimtt/collision.mpg http://www.eng.nus.edu.sg/mpelimtt/leapfrog.mpg http://www.eng.nus.edu.sg/mpelimtt/collid998.JPG Dye Injection:Dye can be used to mark and visualize particular regions of flow or individual fluidstreamlines. To mark streamlines adjacent to a test body, dye is injected from smallhttp://kahuna.sdsu.edu/%7esharring/12ps.html]. (A) (B)Image A. from Flometrics, Solana Beach, Ca. Copyright (C) 2002 by. All Rights Reserved. Image B. contribute by Marco Ghisalberti.constant head reservoir, such as the Mariotte bottle described in the figure below. A Mariotte bottle delivers tracer at constant rate, even as the reservoir is depleted. Vgh