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Questionnaire

Drainage and re-entrainment: what happens without runoff

No drainage → over-wetting → drops blown back: the main cause of "the mist eliminator does not work"

Drainage and re-entrainmentTwo phases: normal film drainage to the outlet, and flooding with droplets torn back into the stream.Phase 2 — flooding and carryoverliquid accumulates → droplets torn into the streamPhase 1 — normal drainagefilm drains → pan → drain
Phase 1 — normal runoff; phase 2 — over-wetting and re-entrainment

Short answer: if the film and drops do not leave the pack, liquid accumulates and is blown back into the stream — over-wetting and re-entrainment. Drainage is not an “installation detail” but a condition for the device to work.

Failure mechanism

  1. Deposition works: drops transfer to the walls.
  2. Runoff is obstructed (a break in the path, a horizontal section, a level change, a blockage).
  3. Liquid accumulates; the section narrows; the velocity rises locally.
  4. Drops are blown back into the stream — sometimes more than without a separator.

Design and installation checks

  • a continuous path for the film into the pan; no horizontal “pockets”;
  • a pan with an outlet and a trap per the design;
  • service access for inspection and washing;
  • the pack orientation matches the model data sheet.