Spray: number of parcels, and relation between injector mass flow rate and # of particles per parcel

The Spray Module tracks a discrete phase (liquid droplets, solid particles) through the computational domain. The discrete phase tracking is achieved by solving the governing mass, momentum, and energy conservation equations in a Lagrangian frame of reference. The discrete phase (that we shall identify as spray “particles” for simplicity) is allowed to exchange mass (evaporation), momentum (drag) and energy (heat) with the continuous phase (surrounding fluid).