The Effect of Aeration on Water Jet Spreading.

摘要

Theoretical and experimental studies were made on jet characteristics when a large number of small air bubbles (.050to .080in dia) were injected into the submerged water jet to form a two phase flow. In experimental studies for both axisymmetric and planar aerated jets,initial jet velocity was varied from 1.39to 9.23ft/sec,initial air to mixture void fraction from 0to .495,initial temperature difference between the jet and its ambient from 0to 34.2C,and for the aerated planar jet tests,submergence from 4.9to 14.9in. Respective influences from these parameters on jet behavior were investigated. The dependent variables measured included jet trajectory,local jet diameter or thickness for a planar jet,and centerline temperature decay. The theoretical analyses for both axisymmetric and planar aerated jets were based on a separated-flow model in which fundamental equations characterizing each phase of the air-water mixture were included. The system of differential equations was solved numerically and yielded predictions in agreement with the experimental data.