Microchannel Slip Flow Characteristics by Time Travel After Photobleaching Velocimetry

Interfacial science follows the study of observing behavior between two or more phases of matter when in contact. For example, a liquid solution passes through a microchannel, and the walls interact with the fluid shearing along the surface. The fluid particles develop momentum changes from interfacial phenomena and slip along the wall begins to affect the fluid body. Slip flow is a name for the phenomenon, and with it, modeling velocity for the interfacial behavior demands both resolution and minimal interference. Laser-induced fluorescence photobleaching anemometry (LIFPA) works as a sound method for acquiring data on microchannel flow, but it needed precalibration. Building upon the success of LIFPA, measuring the fluorescence of dye between two lasers, time travel after photobleaching velocimetry (TTAPV) has been developed as a calibration free method. This study overviews how slip flow can be measured for a rectangular microchannel. Results for a rectangular microchannel have been produced for near wall conditions. In addition, the use of TTAPV for rectangular microchannels has been evaluated by comparing the results to theoretical modeling. Showing the consistency of TTAPV for different geometries, the study reinforces the viability of TTAPV in the research of interfacial science.