Onset of Vapor Bubble Nucleate in Microheater during Rapid Heating

摘要

The incipience of boiling is practical interest in heat exchanger design and has been studied extensively for conventional heat transfer applications. The paper presents a new model to determine the relation between nucleation temperature and heating rate on the microheater during rapid heating basing on non-equilibrium thermodynamic fluctuation theory. The main cause of nucleation temperature of liquid on the microheater relating on heating rate are that the surface of microheater is rough and the cavity on surface will reduce the work of formation of vapor nucleation. When enough energy supply vapor nucleation will grow to experimental observable state. The higher heating rate, the higher nucleation temperature. The nucleation temperature goes almost to homogeneous temperature when heating rate is very great.