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利用直接读数的气泡频率及分率测定仪,研究了空气—水系统内的水平浸没式喷嘴气体流出行为。对于喷入液相后的气体射流进行了三维空间的测定。实验发现,喷射气流中气泡是在气流与液相接触面剪切应力最大处产生,实验测得了剪切应力最大处几何参数和气泡频率。气泡分率的测定,较确切地描绘出了气体射流在液相中的行为,在低修正弗鲁德数下,与Szekely理论计算有出入,证实了Asaki等摄影法的研究结果。
Using the direct reading bubble frequency and fractional analyzer, the gas outflow behavior of a horizontal submerged nozzle in an air-water system was studied. The gas jet after liquid phase injection was measured in three dimensions. The experimental results show that the bubbles in the jet stream are generated at the maximum shear stress at the contact surface between the air stream and the liquid phase. The geometrical parameters and the bubble frequency at the maximum shear stress are experimentally measured. The determination of the bubble fraction accurately delineated the behavior of the gas jet in the liquid phase. Under low-corrected Froude numbers, it was discrepant with Szekely’s theoretical calculations, confirming the findings of Asaki et al.