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Vol.32, No.1, 38 ~ 46, 1994

Title

Aspiration Pressure and Melt Flow in Confined Type Gas Atomizer

김관식 , 김종희 , 김원태 , 천병선 K . S . Kim , J . H . Kim , W . T . Kim , B . S . Chun

Abstract

The effects of atomizing gas pressure and geometry of melt delivery nozzle on the aspiration pressure, water flow rate and gas flow rate were studied in two different types of gas nozzles(converging gas nozzle, and converging and diverging gas nozzle). In case of converging gas nozzle, adjustment of protrusion length of the melt dilivery nozzle below the gas nozzle is required to get stable high aspiration pressure. The optimum extrusion distance varies with outer diameter of melt delivery nozzle. In case of converging and diverging gas nozzle, high aspiration pressure is obtained without any extrusion of melt dilivery nozzle. the effect of inner diameter of melt delivery nozzle on the aspiration pressure is insignificant in both types of gas nozzles. Variation of water flow race with aspiration pressure can not be interpreted with Bernoluui`s equation because the aspiration pressure was measured without water flow, which affects the has field during atomization. Gas flow rate increases linearly with atomizing gas pressure. With increasing atomizing gas pressure the ratio of gas flow rate to melt flow rate increases.

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