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为了研究微波加热湿旧沥青混合料过程中的质热传递规律,分析了微波加热再生过程中的质热传递现象,并基于Fick扩散定律和傅里叶热传导模型,建立了沥青混合料内非稳态传热传质数学模型。考察沥青混合料内部温度和湿度沿微波传播方向的变化,研究了初始条件、边界条件及湿度、微波渗透深度和内热源三者间的关系;建立了传热传质耦合方程的数值计算模型,采用交替显格式数值解法对该模型进行数值模拟,获得了温度、湿度和加热时间三者间的关系;使用了工作频率为2.45 GHz的微波系统对湿旧沥青混合料进行了加热试验。结果表明:在加热温度和脱水除湿方面,试验测试结果与数值模拟结果基本一致,从而验证了传热传质模型的正确性,对湿旧沥青混合料的微波加热再生工艺具有实际指导意义。
In order to study the law of heat and mass transfer during microwave heating of wet asphalt mixture, the mass and heat transfer phenomena in microwave heating regeneration process were analyzed. Based on the Fick diffusion law and Fourier heat conduction model, the instability of asphalt mixture State heat and mass transfer mathematical model. The relationship between the initial conditions, the boundary conditions and humidity, the penetration depth of microwave and the internal heat source was investigated. The numerical calculation model of heat and mass transfer coupling equation was established, The numerical simulation of the model was carried out by using alternating and explicit numerical solution to get the relationship between temperature, humidity and heating time. The heating test of wet asphalt mixture was carried out by microwave system operating at 2.45 GHz. The results show that the results of the test and the numerical simulation are basically consistent in the heating temperature and dehumidification and dehumidification, which verifies the correctness of the heat and mass transfer model, which is of practical significance for the microwave heating regeneration process of wet and dry asphalt mixture.