Advanced Iterative Procedures for Solving the Implicit Colebrook Equation for Fluid Flow Friction

Figure 2

Area in which 2 iterations (left) and 3 iterations (right) are sufficient to calculate the flow friction factor λ with accuracy of 10⁻⁸ using Colebrook equation solved in Newton’s procedure when calculation goes through the transmission factor x and using approximation with error of up to 10%.