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Method and device for the controlled break-up of liquid jets
| Details |
Inventors: Bedetti, Gianfranco;
Assignee: Urea Casale S.A. (Lugano-Besso, CH)
Primary Examiner: Weldon; Kevin
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
A method for the controlled break-up of liquid jets for production of substantially monodispersed drops stands out for the fact that it comprises the steps of feeding a plurality of first liquid jets having steady motion to a plurality of mutually independent sectors and defined in a perforated surface, forming a head of liquid in the sectors near the perforated surface, causing the liquid to flow across the perforated surface to form a plurality of second liquid jets, periodically changing with a predetermined frequency the momentum of the liquid fed to a predetermined sector so as to impart to the liquid present in said sector a disturbance of predetermined magnitude consisting of a periodic change in the pressure near the perforated surface which is transmitted to the second liquid jets causing their controlled break-up in a plurality of substantially monodispersed drops. |
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DETAILED DESCRIPTION The technical problem underlying the present invention is to make available a method for the controlled break-up of liquid jets allowing obtaining substantially monodispersed drops and simultaneously which would be reliable, easy to implement and not requiring high energy consumption and operating costs.
According to the present invention the above mentioned problem is solved by a method of the type indicated above and comprising the following steps: feeding a plurality of first liquid jets having steady motion to a plurality of mutually independent sectors defined in a perforated surface; forming of a head of liquid in these sectors near the perforated surface; causing the liquid to flow across the perforated surface to form a plurality of second liquid jets; periodically changing with a predetermined frequency the momentum of the liquid fed to a predetermined sector so as to impart to the liquid present in that sector a disturbance of predetermined magnitude consisting of a periodic change of the pressure near the perforated surface which is transmitted to the second liquid jets causing their controlled break-up in a plurality of substantially monodispersed drops.
In the following description and subsequent claims, with the term: `liquid jet having steady motion`, it is intended to mean liquid jets having flowrate and velocity constant in time.
In the following description and subsequent claims, with the term: `mutually independent sectors`, it is intended to mean sectors hydraulically separate from each other.
Advantageously, by means of the present invention it is possible to obtain substantially monodispersed drops by feeding the liquid for formation of the second jets under stationary conditions and at the same time causing variation in an appropriate manner of the pressure of this liquid.
This is made possible in particular by division of the perforated surface in a plurality of sectors and by feeding to the sectors a plurality of first jets.
Indeed, by proceeding in this manner it was surprisingly found that it is sufficient to appropriately change the momentum of the liquid fed to a predetermined sector, while holding constant the momentum of the first jets fed to the perforated surface and thus operating under stationary conditions, to obtain in a simple but at the same time accurate and reliable manner a controlled break-up of the second liquid jets leaving the perforated surface
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