Nucleation test rig

Nuclei as source of cavitation phenomena

Whether cavitation occurs in fluid systems, depends largely on the condition of the liquid. Dissolved inert gas leads to the formation of tiny gas bubbles, so-called nuclei. These can either be located as free nuclei in the fluid or in the form of wall-bound nuclei (pore nuclei) on particles or in the boundary walls. The nucleation test rig is used to investigate the formation of free gas bubbles from surface nuclei.

Description

Optical examination of nucleation of single and multiple surface nuclei
Analysis of frequencies of detachment and coalescence
Measurement of bubble sizes and determination of size distributions
Analysis of contact line dynamics of detaching surface nuceli

Experimental Methods

High-speed imaging
Image processing

Technical equipment

Ultra-highspeed camera with 512 x 256 pixels at 120,000fps
Optically accessible test section
Microlithographically manufactured specimen
Test rig for batch and continuous operational mode

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