A tiny heat probe for measuring the thermal conductivities of non-rigid materials
A tiny heat probe for measuring the thermal conductivities of non-rigid materials
复制标题
DOI：
10.1088/0957-0233/5/11/003
复制
发表时间：
1994-11
影响因子：
2.4
通讯作者：
Shuxia Cheng;Y. Jiang;X. G. Liang
中科院分区：
文献类型：
--
作者：
Shuxia Cheng;Y. Jiang;X. G. Liang
研制了一种用于测量非刚性材料导热系数的改进型微热探头。对经典的热探针提出了许多修改建议。在本热探头中，用作加热元件和电阻温度计的涂覆有薄聚酯层的绕组铜线被封闭在插入被测介质的薄金属管中。调节电压被提供给导线。被测材料的热导率可以从已知时间间隔内导线中的电阻增加值获得。建立了消除加热器功率变化影响的修正公式和减小探头热常数和尺寸影响的时间估计。用该热探针测量了水果、石墨粉、NaCl水溶液、蒸馏水和生物组织等非刚性材料的导热系数，相对误差小于3%。
An improved tiny heat probe for measuring the thermal conductivities of non-rigid materials has been developed. There have been a number of modifications suggested to the classical heat probe. In the present heat probe, a winding copper wire coated with a thin polyester layer, used as a heating element and a resistance thermometer, is enclosed in a thin metallic tube which is inserted into the measured medium. A regulation voltage is supplied to the wire. The thermal conductivities of the measured materials can be obtained from the resistance increase values in the wire over a known time interval. A correction formula for eliminating the effects of varying power in the heater and a time estimation for reducing the effects of the thermal constants and size of the probe are established. Using the heat probe, the thermal conductivities of non-rigid materials, such as fruits, powdered graphite, aqueous NaCl solution, distilled water and biotissues were measured with relative error less than 3%.