From advanced hydraulic modelling to performance indicator for the efficiency of investments in leakage management of pressurized water systems.

Introduction: The digital transition is meant as the review of processes using digital technologies and strategies to increase efficiency based on a simpler collection of representative data. The process of interest here is the leakage management in systems distributing water.

Objective: To develop a novel key performance indicator (KPI) for leakage management considering the needs of ongoing digital transition in the water sector, which is opening a new era in the management of drinking water infrastructures.

Gravity-Induced Coagulation of Spherical Particles of Different Size and Density.

We consider a dilute homogeneous suspension of rigid spherical particles with different size and density in a motionless Newtonian fluid. These particles are moving under gravity at low Reynolds and Stokes numbers (negligible fluid and particle inertia) and high Peclet numbers (negligible Brownian diffusion). Doublets are formed when two particles in relative motion are brought into contact by the action of the attractive van der Waals force.