Viscosity correction factor

Correlating factor for viscous flow power, Table 5-1 Mixing factors, turbulent flow power. Table 5-1 Viscosity correction factor for turbulent How (static mixer)... 

Since the viscosity correction factor is dependent upon the actual orifice area, direct solution is not possible and a trial orifice size must be found before Ihe Ku can be determined accurately. 

Select Ihe next larger orifice size, or an M" orifice with 360 sq in. orifice area. (This should be about 20% greater than the calculated area to allow lor reduction of capacity due to Ihe viscosity correction factor "Ku")... 

Ky = liquid viscosity correction factor (see Figures 7-23 or Figure 7-24). 

As discussed in Section 9.4.3, heat transfer data are conveniently correlated in terms of a heat transfer factor j/ again modified by the viscosity correction factor ... 

The viscosity correction factor will normally only be significant for viscous liquids. 

The viscosity correction factor 14 was neglected when calculating the heat transfer... 

Prandtl number, from Example 12.1 = 5.1 Neglect viscosity correction factor (n/nw). 

The viscosity correction factor is neglected in this rough calculation. 

A correction for fluid viscosity must be applied to the flow coefficient (Cv) for liquids other than water. This viscosity correction factor (Fv) is obtained from Fig. 10-23 by the following procedure, depending upon whether the objective is to find the valve size for a given Q and AP, to find Q for a given valve and AP, or to find AP for a given valve and Q. 

Figure 10-23 Viscosity correction factor for Cv. (From Fisher Controls, 1977.)...

The Reynolds number is then calculated from Eq. (10-56), and the viscosity correction factor, Fw, is read from the bottom curve in Fig. 10-23. The corrected flow rate is then... 

For a given valve (Cv) and given flow rate (Q), calculate the Reynolds number as above and read the viscosity correction factor, Fv, from the top line of Fig. 10-23. The predicted pressure drop across the valve is then... 

Darby and Molavi2 developed an equation to represent the viscosity correction factor shown in Figure 9-2. This equation applies only to Reynolds numbers greater than 100 ... 

Kv is the viscosity correction factor (unitless) and Re is the Reynolds number (unitless). 

R. Darby and K. Molavi, Viscosity Correction Factor for Safety Relief Valves, Process Safety Progress (1997), 16(2). 

Figure 9-2 Viscosity correction factor Kv for conventional reliefs in liquid service. Source API RP 520, Recommended Practice for the Sizing, Selection, and Installation of Pressure-Relieving Systems in Refineries, 6th ed. (1993), p. 35. Used by permission of the American Petroleum Institute, Washington, DC.

These values are then multiplied by a correction factor to account for hydrocarbon viscosity. Correction factors for different hydrocarbon types are... 

As an example for calculating binding constants by the different equations, the interactions between three /3 -blockers and HP-/3-CD are examined. The plots are shown in Fig. 4. The effective mobilities are corrected by the use of the viscosity correction factor introduced by Chen et al. (55). 

Fig. 9.6 Viscosity correction factor for rigid spheres settling axially in circular columns with...

R Darby Molavi, "Viscosity Correction Factor for Safety Relief Valves", Process Safety Progress 16 (2), 80-82,1997... 

Kv = Viscosity correction factor (assume 1.0 if unknown or Appendix G)... 

---