利用瞬态平面热源法检测烟丝热物性的方法

Measuring Thermal Properties of Cut Tobacco with Transient Plane Thermal Source Method

利用瞬态平面热源法建立了测试堆积烟丝热物性(导热系数、热物性参数、体积热容)的实验装置、计算了仪器工作参数并测量了烟丝在不同含水率、堆积密度下的热物性数据;考察了不同水平下检测热物性数据的重复性。结果表明:实验数据的重复性较好。导热系数测试结果精密度范围为:0.00030～0.00471W/m.K;热扩散系数测试结果精密度范围为0.00371～0.02424mm2/s;体积热容测试结果精密度范围为0.00921～0.06537MJ/m3.K。烟丝导热系数、体积热容与烟丝含水率、堆积密度正相关,热扩散系数与烟丝含水率、堆积密度负相关。

Basing on a transient plane thermal source method, an experimental device was established for measuring thermal properties （thermal conductivity, thermal diffusivity and volume thermal capacity） of cut tobacco, the working parameters of the device were calculated, and the thermal conductivity, thermal diffusivity and volume thermal capacity of cut tobacco of different moisture contents and bulk densities were measured. Moreover, the repeatabilities of the experimental data were investigated at different measuring levels. The results showed that ： 1 ） the repeatability of experimental data was rather good ; 2 ） the precision ranges of thermal conductivity, thermal diffusivity and volume thermal capacity were 0. 00030 - 0. 00471 W/m -K, 0. 00371- 0. 02424 m2/s, and 0.00921-0. 06537 MJ/m3 -K, respectively; 3） thermal conductivity and volume thermal capacity were positively, but thermal diffusivity was negatively correlated to tobacco moisture content and bulk density.