【作者】 张慧；

【导师】 马重芳；

【作者基本信息】 北京工业大学 ， 热能工程， 2001， 硕士

【摘要】 本文的研究内容是自二十世纪七十年代开始在国际上形成的一个沸腾传热研究领域的热点——瞬态沸腾现象的研究。 作者在综合分析前人的实验工作的基础上，建立了以表面热电偶、薄膜热电偶为传感器的瞬态沸腾实验台。利用自行开发的数据采集程序系统对瞬态沸腾现象进行监控和温度信号的测量；并对瞬态试验前的稳态温度场进行了数值模拟，通过与稳态试验数值的比较，来验证实验件的温度场分布。 利用数学方法——小波理论成功分离了快速数据采集系统中温度信号和噪音信号，得到瞬态沸腾的温度变化曲线；并通过建立数学模型、利用实验所得的温度变化曲线，求解出瞬态热流密度。 我们使用饱和水作为工质，在不同的液位下做了瞬态沸腾的对比试验。通过试验，我们得出了一些有规律的结论，并得到了验证。更多还原

【Abstract】 The content of this thesis is the experimental research of transient boiling phenomena, which are the hot spot that was formed in the boiling heat transfer field since 1 970s.On the basis of the predecessors?experiment, the author set up the experimental apparatus of transient boiling using the surface thermocouple and thin-film thermocouple as sensors. Using data-collecting system developed by ourselves and controlling different parameters, the author monitors the phenomenon of transient boiling and measures the temperature signal. In order to verify the experimental results, numerical simulation of the steady temperature field is carried out before the transient experiment. Temperature field is rectified by comparison of data between the simulation and experiment. By analyzing and processing bountiful experimental data collected in short time, the curves of temperature variation of fast transient nucleate boiling are then drawn with wavelet analysis theory. Also by setting up the mathematical model and applying the temperature variation curves to this mathematical model, heat flux density can be resolved.We employed the saturated water as boiling medium to make tests with different liquid level. Some conclusions were obtained and verified.更多还原