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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.

Analysis is performed of the effect of the basic process parameters on the pressure loss under conditions of two-phase flow in a pebble bed. Relations are suggested, which generalize the available data of experiments involving steam-water flows in pebble beds (the ranges of variation of pressure from 0.9 to 15.6 MPa, of mass velocity in the pebble bed from 180 to 770 kg/(m 2 s), and of steam quality from zero to 0.48), as well as the data for porous structures of sintered spherical bronze particles of small diameter (0.16-0.63 mm) at relatively low pressures (0.2-0.59 MPa) and low mass velocities (10 to 27 kg/(m 2 s)), and in a wide range of variation of void fraction (0-1.0).

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