Liquid Jet – Source of Energy

In this research performed, the phenomena of air entrainment due to a plunging liquid jet was investigated. The effect of the nozzle diameter, jet length and volumetric flowrate of jet on the air entrained was also examined. Additionally, the volume of air entrained and void fraction was calculated for each experiment run. Lastly, an energy analysis was performed, where the kinetic energy of the jet, potential energy dissipation rate of air and the energy dissipation ratio was determined, looking at the impact of the flowrate, nozzle diameter and the jet length. In the procedure to complete the objectives, the length of the jet was varied three times at lengths of 3, 5 and 7 inches and similarly the nozzle diameters used, were 9/64, 7/32 and 3/8 inches.本研究针对下落液体射流（plunging liquid jet）引发的空气卷吸（air entrainment）现象开展了实验研究。同时考察了喷嘴直径、射流长度与射流体积流量对空气卷吸量的影响。此外，本研究对每组实验的卷吸空气体积与空泡率（void fraction）进行了计算。最后开展了能量分析，测定了射流动能、空气势能耗散率以及能量耗散比，并探究了体积流量、喷嘴直径与射流长度对上述参数的影响。在为达成研究目标设计的实验流程中，射流长度分别设置为3、5、7英寸共3种工况，所用喷嘴直径依次为9/64、7/32与3/8英寸。