Abstract
Flow-resistance laws—as used, for example, in water-supply pipe networks—are formulas relating the volume flow rate, q, along a pipe to the pressure-head difference, t, between its ends, such that q=ψ(t), in which ψ is monotonic. The simple Hazen-Williams power law is often used, but in appropriate circumstances the more complicated Colebrook-White law (CW) may better represent aspects of the experimental data. Result 1, the first and easiest-to-state result in the paper, is that ϕCW, the inverse of ψCW, can be expressed in terms of the Lambert W-function (Corless et al. 1993). Result 2 summarizes one use of this, and of related results, in convex optimization problems describing equilibrium flows in pipe networks.
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