Influence of headers form and sizes to hydraulic resistance of header devices with pebble beds
On the base of experimental data and hydrodynamics computations it is considered physical mechanics of origination of hydraulic resistance in header devices containing pebble beds and perforate walls. It was shown that the reason of hydraulic resistance origination to a great extent is bends and track of the flow beyond pebble bed. The reasons of experimental obtained considerable increase of resistance under some variations of sizes and form of headers are considerate. Some recommendations of construction measures decreasing hydraulic resistance are given. It is confirmed discovered earlier more essential influence of collecting header to hydraulic resistance comparison with distributing header. It is mentioned great turbulence in collecting headers. Using simulation and comparisons with experimental data it is determined phenomenon of holes blocking in pebble beds, i.e. essential decreasing of real perforation degree of walls in comparison with construction one under holes sizes comparable with particles sizes.