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研制了一种可同时准确测玻璃导热系数、热扩散率的新型仪器。原理上,根据热线在圆柱坐标系下的传热微分数学模型,直接利用数值解法结合计算机编程,不用查表可实现玻璃导热系数及热扩散率的同时测算。硬件结构上,将温度测点改为试样厚度方向布置,热线两侧用试样包夹,在缝隙中填充试样粉末,降低了实验操作难度。采用极细T型热偶丝+PLC可编程控制器采集温度数据,结合有效测试时间智能判别算法保证了参数测算精度。对市面上若干种浮法玻璃进行热物性测试实验,结果与单项热物性测试仪结果误差小于5%,且可重复精度好于3%,为玻璃热物性参数的高效准确测定提供了新的方法。
Developed a new instrument that can accurately measure the glass thermal conductivity, thermal diffusivity at the same time. In principle, according to the heat transfer differential mathematical model of the hot line in the cylindrical coordinate system, the direct numerical calculation method combined with computer programming can be used to calculate the thermal conductivity and thermal diffusivity of the glass without looking up the table. Hardware structure, the temperature measuring point to the thickness of the sample layout, the hotline on both sides of the sample folder, fill in the gap sample powder, reducing the difficulty of experimental operation. The use of very fine T-type thermocouple + PLC programmable temperature data acquisition, combined with effective test time intelligent identification algorithm to ensure the accuracy of the parameters. The thermophysical properties of several kinds of float glass on the market were tested and the results were less than 5% and the repeatability was better than 3%. The results provided a new method for the efficient and accurate determination of glass thermophysical parameters .