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notes - d Viscosity and drag i Reynolds number 1 Re=v*l V a...

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2/7/08 1. Buoyancy mechanisms a. Table 11.8 2. Locomotion a. Moving around in water i. Displace water in front and create a vacuum in the area directly behind b. Fish i. Muscles are the engine; tail fin is the propeller ii. Undulations reach out and pull yourself through the water. This is the friction that is needed for movement c. Jet propulsion i. Large internal cavity inside their mantle ii. The mantle fills with water, and then muscles expel the water; iii. Use muscle contraction to fill the mantle cavity as well iv. Then relaxation expels the water for propulsion v. Problem with jet propulsion 1. Stop and start process; takes time
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Unformatted text preview: d. Viscosity and drag i. Reynolds number 1. Re=v*l / V a. v = velocity b. L = length of the object c. V = kinematic viscosity d. (viscosity / density of medium) ii. Drag 1. Marine organisms usually take a narrow front, wide middle, then a tapering end a. This increase efficiency of movement b. Elimante pile up in front and cacuum behind 2. Laminar a. At high speeds can be worse than turbulent flow b. Sometimes turbulent flow is more efficient because it has less of a vacuum 3. Table 3.12 iii. Small animals take much more energy to move at higher speeds than larger animals e....
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