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由于真空玻璃的导热系数测量复杂,本文提出一种基于非稳态传热过程的软测量表征真空玻璃导热系数的模型。首先,在连续介质与半无限大物体的前提下,采用能量守恒定律与拉普拉斯变换法,对数学物理模型进行求解,建立非加热面的中心温度计算公式。然后,利用数值仿真软件FLUENT对物理模型进行温度场仿真。仿真结果表明:检测时间少于5分钟,达到节约时间的目的;为保证温度测量准确,取多个测量点的测量值;为减小测量误差,采用圆形加热片时,加热片的半径与真空玻璃厚度之比要大于3。这些为后续研究真空玻璃导热系数与温度变化之间的关系奠定一定的理论和应用基础,对实验有指导意义,为真空玻璃导热系数的在线检测和其过程的优化控制提供指导。
Due to the complexity of the measurement of the thermal conductivity of vacuum glass, a model based on soft sensing of unsteady heat transfer to characterize the thermal conductivity of vacuum glass was proposed. Firstly, on the premise of continuous medium and semi-infinite objects, the mathematical physics model is solved by the law of conservation of energy and the Laplace transform method, and the formula for calculating the center temperature of the non-heating surface is established. Then, using the numerical simulation software FLUENT to simulate the temperature field of the physical model. The simulation results show that: the detection time is less than 5 minutes to achieve the purpose of saving time; in order to ensure accurate temperature measurement, taking measurements of multiple measurement points; in order to reduce measurement error, the use of circular heating plate, the heating plate radius and The ratio of vacuum glass thickness is greater than 3. These provide a theoretical and application basis for the follow-up study of the relationship between the thermal conductivity of vacuum glass and the temperature change, which is of guiding significance to the experiment and provides guidance for on-line detection of the thermal conductivity of the vacuum glass and optimization control of the process.