A DEVICE AND A PROCESS FOR DETECTION OF NUCLEATION STAGE OF VAPOUR BUBBLES FORMED DURING BOILING OF NANOFLUIDS

摘要

The present invention relates to a device for detection of nucleation stage of vapour bubbles formed during boiling of nanofluids, comprising a transparent glass plate supported over a metal ring; the metal ring holding a droplet of nanofluid, and disposed over a heater such that a substantial portion of the metal ring inserted tightably inside the heater, a smaller portion of the metal ring being exposed outside the heater; a high-speed camera with frame speed of at least 150 f/s mounted vertically downward to said glass plate; wherein when the heating temperature by the heater progressively increased, a thermal radial gradiant at the contact area between the glass plate and the metal ring is generated, and wherein the transparent layer on said glass plate minimizes the thermal radial gradiant allowing capturing the images of the vapour bubbles at the nucleation stage.