Experimental Study of Near-Wall Liquid Film Outflow with Co-Current Gas Flow from Nozzle into Vacuum. 2. Flow Structure behind Nozzle

Physical-Chemical Kinetics in Gas Dynamics Pub Date : 1900-01-01 DOI:10.33257/phchgd.20.3.841

Y. Vyazov, V. Prikhodko, I. Yarygin, V. Yarygin

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Abstract

Outflow of a near-wall liquid film with co-current gas flow from a nozzle (cylindrical channel) into vacuum is studied experimentally. Special features of near-wall liquid films ejection into vacuum are established with the help of the developed measurement techniques (droplet phase flow structure visualization with ordinary and laser illumination, deposition of droplets on paper substrates, spectrophotometry): turn of the film in the opposite direction at the nozzle lip and its rise along the outer surface of the nozzle against gravity, cooling due to evaporation, disintegration into droplets with the formation of the spatial flow structure, which includes two typical areas: central and peripheral. The temperature of the liquid film formed on the outer surface of the nozzle is measured. It is shown that the film is cooled down to a temperature at which the pressure of liquid saturated vapors becomes equal to the pressure in the vacuum chamber. The distribution functions of droplets by size, direction of fly, and velocity in the peripheral area of the flow are obtained.

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近壁液膜流出喷嘴共流气体进入真空的实验研究。喷嘴后流动结构

实验研究了带共流气体的近壁液膜从喷嘴(圆柱通道)向真空的流出。利用已开发的测量技术(普通和激光照明下的液滴相流结构可视化、在纸基上的液滴沉积、分光光度法)，建立了真空中近壁液膜喷射的特殊特征:膜在喷嘴唇处以相反方向转动，其沿喷嘴外表面上升，受重力作用，因冷却而蒸发，分解成液滴，形成空间流动结构，其中包括两个典型区域:中心区域和外围区域。测量在喷嘴外表面形成的液膜的温度。结果表明，薄膜冷却到饱和液体蒸气的压力等于真空室压力的温度。得到了液滴在流动外围区域按粒径、飞行方向和速度的分布函数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Physical-Chemical Kinetics in Gas Dynamics

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