In-situ digital image correlation strain monitoring method for electrospun ceramic fiber membrane in flow reactor and application

Abstract

An in-situ digital image correlation strain monitoring method and its application for electrospun ceramic fiber membranes in a flow reactor is disclosed. This method involves spraying insoluble black paint particles onto the surface of a white ceramic fiber membrane to create a high-contrast random speckle pattern. The speckled fiber membrane is then loaded into the flat section of a flat-plate flow reactor and pre-tensioned and flattened by replacing the original top cover with a rigid cover. A calibrated dual-camera two-dimensional digital image correlation system is set up directly opposite the optical observation window, and a region of interest is selected. Image sequences are continuously acquired under various flow rates of gas and electrolyte. Digital image correlation operations are used to extract the full-field two-dimensional strain contour map and time-resolved strain oscillation curve of the fiber membrane. This method enables non-contact, full-field, real-time monitoring of the in-surface mechanical response of the fiber membrane under real flow conditions. It can be used to evaluate the structural stability of the fiber membrane photoelectrode in a photoelectrochemical flow reactor and to screen and optimize the fiber membrane structure.

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