抄録
A transparent heating surface with multiple arrays of 88 thin film temperature sensors and mini-heaters was developed for the clarification of boiling heat transfer mechanisms in microgravity through the investigation of the relation between local heat transfer coefficients and behaviors of liquid microlayer underneath vapor bubbles. Local surface temperatures were controlled to keep a constant on the entire heat transfer surface by feedback circuits. To examine the validity in the operation of the developed heating surface, preliminary pool boiling experiments from a downward-facing surface were conducted on ground by using FC72. The local heat flux change characterized by the heat transfer enhancement due to the microlayer evaporation and the heat transfer deterioration by the extending dry patch were detected corresponding to the liquid-vapor behaviors underneath a coalesced bubble observed directly through the glass substrate. Microgravity boiling experiments by parabolic flights campaign are planned using the heating surface developed.
