Drop recovery system and associated method

A drop recovery system comprising:

• a circulation conduit for the circulation of a working fluid, the circulation conduit comprising an outlet,
• a device for introducing and circulating a working fluid into the circulation conduit, the working fluid comprising a plurality of pockets, each pocket comprising a carrier fluid and a pocket containing a drop of internal fluid, the internal fluid being immiscible with the carrier fluid, each pocket being isolated from the following pocket by a separator, each separator being made up of a separator fluid that is immiscible with the carrier fluid,
• a recovery substrate for receiving the pockets of the working fluid, the recovery substrate comprising several compartments, a compartment being placed opposite the outlet of the circulation conduit,
• a relative displacement device for moving the substrate with respect to the circulation conduit, the displacement device configured to successively place the outlet of the circulation conduit opposite at least two different compartments of the substrate, and
• wherein the recovery system further comprises:
• a preparation device connected to the circulation conduit at a location downstream of the device for introducing and circulating a working fluid, the preparation device receiving the working fluid having said plurality of pockets and said separator fluid therein and being configured to inject, into the circulation conduit, an additional volume of separator fluid and an additional volume of carrier fluid, such that the volume of at least one separator is greater than or equal to a critical separation volume, and such that the volume of at least one bubble formed by a pocket and at least a part of said separator is greater than or equal to a critical detachment volume,
• a tube defining a part of the circulation conduit for the working fluid, the tube emerging on an open mouth at the outlet of the circulation conduit, the tube comprising an outer wall, and
• a nozzle having a through passage, the tube being placed in the through passage of the nozzle,
• wherein the circulation conduit is substantially vertical at the outlet.