摘要
This study integrated temperature-sensitive paint (TSP) into a flow visualization setup to examine bubble generation and flow behavior during the boiling of a temperature-sensitive magnetic fluid (TSMF) under a fluid flow rate of 2 mL/h. TSP was coated on the inner side of the observation window in the aforementioned setup and was in direct contact with the examined TSMF. This approach was adopted because of the difficulty in visualizing the boiling of opaque TSMFs. The TSP exhibited varying luminescence intensities at different temperatures. It considerably improved the observation of the examined TSMF under a charge-coupled device camera, allowing for the visualization and recording of bubble size and location. The integration of the TSP into the flow visualization setup enabled the clear observation of the two-phase flow of the TSMF in an aluminum microchannel. Overall, the proposed method is highly valuable for visualizing the flow and bubbling behaviors of opaque or light-absorbing fluids.
•TSP enables visualization of boiling in opaque magnetic fluids.•High-contrast imaging of gas-liquid interfaces is achieved.•Bubble formation and flow dynamics are successfully captured.