Chapt06

2 250000 1000 12 or 2 2 the unknowns are or and

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Unformatted text preview: aP/Rho) Finally, input the proper formula for the discharge coefficient. For example, for the flow nozzle, Cd 0.9965 0.00653 Beta 0.5 (1E6/Re) 0.5 When asked to Solve the equation, EES at first complains of dividing by zero. One must then tighten up the Variable Information by not allowing , , or Cd to be negative and, in particular, by confining to its practical range 0.2 0.9. EES then readily announces correct answers for the flow nozzle: Alpha Summary 1.0096 Cd 0.9895 Beta 0.4451 | v v This chapter is concerned with internal pipe and duct flows, which are probably the most common problems encountered in engineering fluid mechanics. Such flows are very sensitive to the Reynolds number and change from laminar to transitional to turbulent flow as the Reynolds number increases. The various Reynolds-number regimes are outlined, and a semiempirical approach to turbulent-flow modeling is presented. The chapter then makes a detailed analysis of flow through a straight circular pipe, leading to the famous Moody chart (Fig. 6.13) for the friction factor. Possible uses of the Moody chart are discussed for flow-rate and sizing problems, as well as the application of the Moody c...
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