摘要 : Local and temporal temperature mapping of the liquid phase around boiling bubbles and above the heat-transfer surface reveals that convective heat transfer plays a significant role in boiling heat transfer. To investigate this, we... 展开 Local and temporal temperature mapping of the liquid phase around boiling bubbles and above the heat-transfer surface reveals that convective heat transfer plays a significant role in boiling heat transfer. To investigate this, we employ one of the most accurate methods for detecting temperature: the laser-induced fluorescence (LIF) technique. Previously, ratiometric LIF has been conducted mainly at temperatures well below 70 degrees C, which is too low for our purposes. We used Rhodamine B (RhB) and Rhodamine 110 (Rh110) as fluorescent dye pairs. We found that Rh110 excited by a 532-nm laser (rather than the blue laser used in some earlier studies) exhibited a temperature dependence: the combination of RhB and Rh110 could be used as a temperature indicator up to 88 degrees C. The calibration curve was extended beyond the superheating temperature range, permitting liquid-phase temperature visualization of boiling. A thin film heater sandwiched between two transparent plates was used to gain optical access to the liquid-vapor structure. This method successfully captured characteristic phenomena such as superheated liquid layer formation and thermal plumes beneath the rising boiling bubbles. 收起