Abstract
In order to find criteria which can be used to control the trajectory of the air jet into a ventilated airspace, modeling the drop distance using the Archimedes number is proposed. The term jet drop distance, defined as the horizontal distance from the inlet to the point where the jet reaches the occupational zone, is used to describe the status of the jet. Following an analysis of jet trajectory models for round inlet openings, jet drop distance models for a rectangular inlet with a bottom hinged flap are described. The models are functions of the inlet Archimedes number, the inlet opening hydraulic diameter and the inlet height above the floor.
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