Flows friction factor

L is the duct length D is the inner diameter / is the flow friction factor... [Pg.765]

Any suitable correlation for the cross-flow friction factor can be used for that given in Figure 12.36, the pressure drop across the ideal tube bank is given by ... [Pg.699]

The flow friction of a channel having subcooled local boiling behaves in a manner similar to the flow friction of a channel having a rough surface. From air-water data obtained at low void fractions (Malnes, 1966), the two-phase flow friction factor without bubble departure was found (Tong, 1968b Thorgerson, 1969)to be... [Pg.351]

Agostini B, Watel B, Bontemps A, Thonon B. Experimental study of single-phase flow friction factor and heat transfer coefficient in mini-channels. CHE Symposium, Grenoble Edizioni ETS, August 2002, 85-89. [Pg.174]

At the beginning of the pipe, the temperature is greater, giving greater viscosity and a Reynolds number of 3.6 x 10. Over the entire pipe length the Reynolds number is very large and the fully rough flow friction factor choice was indeed valid. [Pg.24]

Step 4. Calculate the two-phase-flow friction factor /TP. First it is necessary to define /Tp from f . In charting fn>lf, against X, Dukler applied the following published equation for fa ... [Pg.236]

Agostini, B., Watel, B., Bontemps, A. and Thonon, B., (2004), Liquid flow friction factor and heat transfer coefficient in small channels an experimental investigation. Experimental Thermal and Fluid Science, Vol. 28, pp. 97-103... [Pg.48]

Dodge and Metzner (16) presented an extensive theoretical and experimental study on the turbulent flow of non-Newtonian fluids in smooth pipes. They extended von Karman s (17) work on turbulent flow friction factors to include the power law non-Newtonian fluids. The following implicit expression for the friction factor was derived in terms of the Metzner-Reed modified Reynolds number and the power law index ... [Pg.175]

F — dimensionless turbulent flow friction factor which accounts for friction losses in the vent piping... [Pg.169]

TABLE 5.8 Fully Developed Turbulent Flow Friction Factor in Smooth, Circular Ducts [45]... [Pg.323]

TABLE 5.9 Fully Developed TUrbulent Flow Friction Factor Correlations for a Rough Circular Duct [48] (a = tube radius)... [Pg.325]

For equilateral triangular ducts having rounded corners with a ratio of the corner radius of curvature to the hydraulic diameter of 0.15, Campbell and Perkins [180] have measured the local friction factor and heat transfer coefficients with the boundary condition on all three walls over the range 6000 < Re < 4 x 104. The results are reported in terms of the hydrodynamically developed flow friction factor in the thermal entrance region with the local wall (Tw) to fluid bulk mean (Tm) temperature ratio in the range 1.1 < TJTm < 2.11, 6000 < Re < 4 x 10 and 7.45 [Pg.382]

TABLE 17.16 Fully Developed Turbulent Flow Friction Factors and Nusselt Numbers (Pr > 0.5) for Technically Important Smooth-Walled Ducts [44]... [Pg.1314]

Here is the particle diameter. If we now insert 4 times this definition of the hydraulic radius into the definitions of the pipe flow friction factor and the p pc flow Reynolds number, we find... [Pg.413]

Despite the fact that equation (3.37) is applicable to all kinds of time-independent fluids, numerous workers have presented expressions for turbulent flow friction factors for specific fluid models. For instance, Tomita [1959] applied the concept of the Prandtl mixing length and put forward modified definitions of the friction factor and Reynolds number for the turbulent flow of Bingham Plastic fluids in smooth pipes so that the Nikuradse equation, i.e. equation (3.37) with n = 1, could be used. Though he tested the applicability of his method using his own data in the range 2000 < Reg(l — 4>f 3 — )< 10, the validity of this approach has not been established using independent experimental data. [Pg.101]

Brutin D, Topin F, Tadrist L (2003) A transient method for the liquid laminar flow friction factor in microtubes. AIChE J Fluid Mech Transp Phenom 49(ll) 2759-2767... [Pg.3088]

Once RL is calculated, two phase flow friction factor, fm, is calculated by following equation fm = tt fx (161)... [Pg.115]

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