Measurement on Temperature Change During Dynamic Suction Process of Pneumatic Ejector

摘要

It is available to obtain the flow-rate characteristics of pneumatic ejector with isothermal suction process. This study analyzes heat trans fer effects on dynamic suction process and discusses the parameters of isothermal vacuum tank. Experiments are carried out in temperature measurement with the stop method. The heat transfer ratio is obtained when the air is en trained from the acrylic ch amber under the vacuum condition. Decrement of air temperature inside the vacuum chamber is affected by ejector flow-rate characteristics, heat transfer material and heat transfer area. By enlarging heat transfer area with copper wires, the isothermal suction process can be realized and the flow-rate characteristics of ejector could be measured rapidly and conveniently.