Abstract

The bubbles of water jet cavitation and of multifunction cavitation (MFC) generated by nozzles with diameters of 0.1, 0.2 and 0.8 mm were investigated for the collapse pressure of microjets, the nozzle-specimen distance, the degree of processing, the photocatalyst characteristics for titanium oxide particles, and the multi-bubble sonoluminescence. The dependence of these characteristics on the nozzle diameter was clarified. The nozzle-specimen distance became shorter as the nozzle diameter decreased. The titanium oxide powder was processed with MFC using 0.8, 0.2 and 0.1 mm water jet nozzles. More hydrogen was generated with a nozzle diameter of 0.8 mm than with a 0.1 mm nozzle. A 0.2 mm nozzle generated less hydrogen than a 0.1 mm nozzle because the water jet pressure from a 0.2 mm nozzle was lower. A 0.1 mm nozzle produced the same luminous intensity from cavitation bubbles as a 0.8 mm nozzle. These results mean that the bubble temperature attained by 0.1 and 0.8 mm nozzles is relatively high. The smaller the nozzle diameter becomes, the smaller the bubble diameter and the lower the collapse pressure of the microjet, which leads to a lower degree of processing and reduced influence on photocatalytic properties.

中文翻译：

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加工度和喷嘴直径对多功能空化的影响

摘要

研究了直径为0.1、0.2和0.8 mm的喷嘴产生的水射流空化和多功能空化（MFC）的气泡，以观察微射流的崩塌压力，喷嘴试样距离，加工程度，钛的光催化特性氧化物颗粒，以及多气泡声致发光。明确了这些特性对喷嘴直径的依赖性。随着喷嘴直径减小，喷嘴-样品距离变短。使用0.8、0.2和0.1mm的水喷嘴，用MFC处理二氧化钛粉末。喷嘴直径为0.8 mm的氢气比喷嘴直径为0.1 mm的氢气更多。0.2 mm喷嘴产生的氢气少于0.1 mm喷嘴，因为来自0.2 mm喷嘴的喷水压力较低。A 0。1毫米喷嘴产生的气泡强度与0.8毫米喷嘴相同。这些结果意味着通过0.1mm和0.8mm的喷嘴达到的气泡温度相对较高。喷嘴直径越小，气泡直径越小，微射流的塌陷压力越低，这导致较低的加工度并减小了对光催化性能的影响。