Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 14, 2019
We have developed a micro heat flux sensor for measuring boiling heat transfer at high-resolution. The heat flux sensor consists of two thin film resistance temperature detectors (RTDs) stacked in the substrate thickness direction. The heat flux can be calculated through the one-dimensional transient heat conduction calculation using measured two temperatures. Two kinds of experiments as preliminary test were conducted. First one is the local heat flux measurement during liquid droplet contact on the sensor substrate. The sensor successfully detected a huge heat transfer of over 3MW/m2 with a quick temperature change of ~105K/s just after droplet contact. And another is measurement of the local heat flux beneath a single pool boiling bubble. The heat flux over 1 MW/m2 induced by microlayer evaporation was measured under a bubble. The developed sensor was confirmed to be useful for the measurement of fast and local heat transfer phenomena.
