HYDRAULIC RESISTANCE OF 2-PHASE FLOW IN PIPES WITH POROUS COATING

Results are given of the experimental investigation of hydraulic resis tance of two-phase flows in pipes with porous coatings. The friction c oefficient in the domain of a square law of resistance for a pipe 8 mm in diameter with a porous coating of thickness k(h) = 200 mcm is show n to exceed the values of xi for a smooth-walled pipe by 4-5 times, th ose for industrially rough pipes by 3 times, and those for pipes with sand roughness equivalent to the coating thickness by about 1.4 times. It is found that the roughness of the channel walls due to corpuscula r porous coatings is not the only factor responsible for an increase o f hydraulic resistance governed mainly by hydrodynamic processes in th e pore space of coatings.