Hydrodynamic drag of a flow of steam-water mixture in a pebble bed

An experimental investigation is performed of hydrodynamic drag under conditions of flow of a steam-water mixture in a pebble bed for wide ranges of variation of the process parameters, namely, pressure from $0.9$ to $15.6$ MPa, mass velocity in the pebble bed from $107$ to $770$ kg/(m$^2$ s), and steam quality from zero to $0.48$. The measurement results are given in the table. The experimental data are given in the form of the pressure loss ratio for the flow of steam-water mixture and water at the same flow rates. It is demonstrated that this quantity is in fact independent of the mass velocity and, for each fixed value of pressure, may be described by the linear function of steam quality.