Abstract
Microscopic heat transfer characteristics of boiling in a mini-channel are investigated by the local surface temperature measurement with a MEMS thermal sensor and a high speed observation of boiling behavior in the mini-channel. The heat transfer phenomena included in the elongated bubble boiling were identified from the experimental results. The local wall surface heat transfer was calculated by one-dimensional transient heat conduction analysis with measured wall temperature data as a boundary condition. The initial microlayer thickness and the amount of the evaporated microlayer were evaluated with the local heat flux. The dimensionless initial microlayer thickness increased with Capillary number corresponding to the ratio of the viscous force and the surface tension.
