Experimental Study on Single-Phase Heat Transfer in Circular Tube under Oscillatory Flow Conditions
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摘要: 在中低压两相强迫循环实验回路中,并入一个自主设计制造的流量脉动发生器,通过在平均主流量上叠加不同幅值及频率的正弦脉动,模拟动态流动不稳定性下的流量周期波动。对0.4MPa及1.37MPa下不同脉动幅值的脉动波形及不同频率脉动的转换进行了分析对比,发现实验段外壁温及出口流体温度随流量的脉动做同频脉动,出口流体温度脉动滞后壁温脉动约1/4周期。Abstract: The experimental study on the heat transfer in circular tube under oscillatory flow conditions was conducted. The sinusoidal fluid oscillations under 0.1～1 Hz were made by the oscillator in the text loop to analyze the effect of flow instability on two-phase flow boiling heat transfer. The traces of inlet oscillatory flow in 0.4 and 1.37 MPa and traces under Frequency Modulation Conditions were analyzed,respectively. The oscillations of Wall Temperature and Outlet Temperature were obtained. And,the oscillation of Outlet Temperature which was lag phase about 1/4 cycle,and oscillations of Wall Temperature were with same frequency.
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