利用热探针在现场同时测定松散介质α和λ的“加热-冷却法”

THE "HEATING-COOLING METHOD" FOR MEASURING THERMAL D1FFUSIVITY AND CONDUCTIVITY OF DISPERSED MEDIUM IN THE SCENE WITH A PROBE

本文对利用热探针法现场测试导温系数α和导热系数λ的灵敏度作了分析,提出一种可以有效地同时测定α和λ新的“加热-冷却法”,并通过优化分析得出相应的最佳测试参数.文中也报道了一些测试的结果和相互比较.

In this paper, a new manner "heating-cooling method" is developed to measure the thermal diffusivity a and conductivity λ of dispersed medium simultaneously in the scene with a probe. Both the temperature rises when the heater inside the probe is "on" and the temperature drops when the heater is "off" are to be recorded, and "a" and "λ" of the dispersed medium can thus be calculated out. Efforts were made to select the optimum measuring parameters, so as to determine a and λ more precisely. Analy-sis and experiments show that, the error resulted in thermal diffusivity, a, measured by the "heating-cooling method" will be one half of that measured by the conventional heating method.