Abstract
The microchannels with triangular corrugations usually have high heat transfer ability, but the possible continuous two-phase instable boiling with periodically moving gas-liquid interface may cause the oscillations of pressure drop and temperature of walls, and lead to some control issues and security risks. In this paper, acetone is chosen as the working fluid, and an experimental setup with multi-sensors is built. The straight and triangular corrugated microchannels are applied for comparisons and analysis. Both microchannels have same hydraulic diameters of 104.3 μm. After experiments at the working conditions of G = 250–1100 kg/m2 s and qeff = 208–1050 kW/m2, the similarities and differences about continuous instable boiling between two types of microchannels are found. A prediction model with equations and principles are developed, and the wall temperature at inlet is chosen as the judging criteria. The analysis results show that the wall temperature at inlet dominant the instable boundaries, and which can be affected by the working conditions and structural parameters. The prediction model also indicates that the increasing of flow resistance at inlet, decreasing of inlet temperature and heat transfer coefficient at inlet can reduce the area of instable boiling by about 40%, and decrease the slopes of instable boundaries by 24.2–51.7%.
Published Version
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