Friction factor vs Reynolds number

Figure 6-40 shows power number vs. impeller Reynolds number for a typical configuration. The similarity to the friction factor vs. Reynolds number behavior for pipe flow is significant. In laminar flow, the power number is inversely proportional to Reynolds number, reflecting the dominance of viscous forces over inertial forces. In turbulent flow, where inertial forces dominate, the power number is nearly constant. 

A semi-emperical turbulent one-equation model is developed for rectangular open channel flows of water and viscoelastic fluids. The model is used to predict friction factor vs. Reynolds number relations, velocity profiles, eddy viscosity distributions and turbulent energy budgets. Comparisons are made between the model and the measured results using a Laser Doppler Anemometer. 

Figure 10-155. Shell-side friction factor, f , for pressure drop calculation is determined from plot vs. Reynolds Number, z = viscosity at average flowing temperature, centipoise. (Used by permission Brown Fintube Co., A Koch Engineering Company, Houston, Texas.)...

Chemical engineers are familiar with the Fanning (or Darcy) friction factor,/, the Moody chart of/vs. Reynolds number, Rg, and how all of this fits together to calculate pressure drop for a given fluid flow in a given sized pipe. The friction factor is calculated from the Colebrook equation ... 

To give an impression of the validity of the relations presented in this chapter, two graphs of the friction factor vs. the Reynolds number for two lab-scale G/S BSR modules are taken from Ref. 7. The characteristic size in the calculation of Re, as well as the channel diameter in the calculation of 4/, is the hydraulic diameter of the reactor, i.e., four times the open area over the perimeter of the strings and the reactor wall. 

Figure 4.1 Moody diagram Fanning friction factor, f, vs. Reynolds number for the range of commercial pipe relative roughnesses.

Figure 7 Friction factor vs solvent Reynolds number for 1% Brij 96/92 mixture with 0.5N sodium sulfate at 26°C...

Fig. 2. Friction Factor vs. Solvent Reynolds Number All Six Solutions in 0.460 cm. Tube...

Fioure 40.6 Friction factor c ) vs. Reynolds number. (Reproduced by kind permission of J. F. Richardson. )... 

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