This study aims to investigate the influence of turbulence modulation caused by thread structure on coaxial air-blast atomization by means of high-speed flow visualizations and droplet particle size techniques. The medium in the central channel of the atomizer is water while the annular channel is air flow. Results show that the thread structure added to the inner surface of annular channel plays an important role in the atomization effect. The generated liquid ligaments on the jet present more structures which grow shorter and break up faster than that without thread. In order to compare the difference of jet breakup length and droplet diameter caused by thread structure, we establish a new breakup length model and then use the ratio of structure factors to describe the change of droplet diameter. Results in this experiment confirm the improvement of atomization performance brought by optimization design of thread structure.
This study aims to experimentally and theoretically investigate the roles of threaded nozzle and yield stress in the coaxial air blast atomization of a gelled jet by means of rheological...
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