Advanced Iterative Procedures for Solving the Implicit Colebrook Equation for Fluid Flow Friction
Table 8
Secant procedure. Option 8: two initial starting points λ0 and λ−1 required: starting point λ−1 is with fixed value λ−1 = 0.024069128765101 (i.e., x−1 = 6.445695939) as in Section 2.2.1, while starting point λ0 depends on input parameters: Equation (2), and direct calculation of λ: Equation (18).