CHEN 3005 Lecture Notes - Lecture 16: Solar Transition Region, Signified And Signifier, Turbulence
25 Dec 2014
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Friction factor: flow in a path, flow around a sphere, flow around packed bed. Ex: a sphere of diameter 4. 2 cm in a wind tunnel where air (37. 8 oc, 1 atm) is forced past at various velocities. Always use diameter of spherealways used for engineering. This is a laminar flow: 187 (figure 6. 3) Chen transport page 1 for linear region, f = 24/re = 41. 52. A = projected area of sphere in a flow projected area = area of this circle. Example 2: water @ 24 oc flowing by gravity through a filter bed of small particles (d = 6 mm). The void fraction of the bed is 0. 42. The packed bed has a depth of 1. 5 meters. The level of water above the bed = Can use ergun eqn (b/c can apply to big range of re: 192 and then afterwards, check the value of re. Chen transport page 5 know everything in eqn except pressure hydrostatic pressure.
