Abstract
The influence of the important system parameters on Ledinegg instability was investigated in a narrow rectangular channel with deionized water. The experiment carried out under the condition of: P=0.47, 0.7 and 1 MPa, G=0∼2000 kg/(m2⋅s), ΔTsub,in=60, 75 and 92°C q=173.8, 255.9 and 294.6kW/m2. Based on the small disturbance theory, the negative slope region of the pressure drop-mass flux curve where two-phase mixture prevails was closely examined to quantify the susceptibility of the system to the Ledinegg instability under different flow conditions. The experimental results showed the effects of the heat flux, system pressure and inlet subcooling on the Ledinegg instability: reducing heat flux and inlet subcooling, increasing system pressure can enhance the flow stability in the narrow rectangular channel.
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