TURNING THE PULSATING FLOW INTO LAMINAR FLOW, REDUCTION / ELIMINATION OF EFFECT OF VACUUM, NEW CONSTRUCTIVE SOLUTIONS
Keywords:pulsating flow, preforms, plastics injection, injection and injection stretch blow molding, rapid-prototyping, limited technology, CAD, modelling
The article, as a new concept, analyzes the notion of « pulsating flow », the physical phenomenon seen when emptying bottles of PET or Tetra Pak; which do not have a disposal system of the vacuum created while emptying them, situation in which the fluid stream becomes oscillating in terms of the speed and the flow of the fluid passing through the drain area / section. Pulsating flow is a result of the vacuum created in the container, as opposed to laminar and turbulent flow whose existence is determined by the relative speed of the layers of fluid and the friction forces . In the paper I present some new constructive solutions, designed by AutoCAD and created physically with rapid-prototyping
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