Speaker
jinhui zhang
(Zhejiang University)
Description
Dynamic visualization is of great significance in the research of flow conditions and mass transfer process of cryogenic fluids. At present, spot sampling is commonly used in concentration analysis of cryogenic fluids. However, it cannot provide two-dimensional information for large area and will disturb the fluid. In this paper, a non-contact dynamic optical measurement system using laser interferometry was designed, which is sensitive to subtle changes of fluid concentration so a precise and dynamic interference pattern can be obtained. Ulteriorly, two-dimensional concentration distribution of the fluid can be calculated from the interference pattern. Detailed calculation process is presented in the paper. Influence of gradient magnetic field on the concentration distribution of liquid oxygen-nitrogen mixture was studied with this measurement system, and concentration profiles corresponding to different magnetic structures were measured. It is shown that oxygen enrichment in liquid mixture can be induced by the gradient magnetic field and the increment of oxygen concentration rises when magnetic gradient increases. Gas chromatography was utilized to verify the optical measurement results. The results from these two methods agree well.
Author
jinhui zhang
(Zhejiang University)
Co-authors
Prof.
limin qiu
(Zhejiang University)
ruiping zhang
(Zhejiang University)
shiran bao
(Zhejiang University)
