一种测定生物组织在233～293K温区导热系数的方法  

A Method for Determining Thermal Conductivity of Tissues in Temperature Range 233～293K

作　　者：张海峰[1] 程曙霞[1] 何立群[1] 张爱丽[1] 郑瑛[1] 高大勇[1] 

机构地区：[1]中国科学技术大学热科学与能源工程系,合肥230027

出　　处：《中国科学技术大学学报》2003年第2期197-203,共7页JUSTC

基　　金：国家自然科学基金 (5 9976 0 4 1;5 0 10 6 0 16 ) ;安徽省自然科学基金 (0 0 0 4 75 2 0 ) ;百人计划 (2 0 0 0 .6 - 2 0 0 3.6 )资助项目

摘　　要：微珠状热敏电阻作为球形热源传热模型的基础上 ,提出适用于较宽温区生物组织导热系数测量的方法 ,同时为解决小尺度生物组织的测量提供了有效途径 .对标准样品在 2 33～ 31 3K温度范围导热系数测量的最大误差为 5.1 % .在 2 33～ 2 93K温度范围内对家兔新鲜离体器官心脏、肝脏、肾脏和颈动脉血管的导热系数进行了实验测定 ,结果表明生物组织在低温下的导热系数与冰的相差很大 .A novel method using a tiny thermistor as a spherical heat source has been developed to determine thermal conductivity of biomaterials over a wide temperature range. Based on steady-state spherical heat transfer in an infinite homogeneous medium, thermal conductivity of the measured medium can be determined from the power applied and the temperature rise of the self-heated thermistor. Compared with recommended value, maximum measurement error of thermal conductivity for some standard samples is 5.1% in the temperature range 233～313K. Using the developed technique, thermal conductivities of rabbit liver, kidney, heart, and carotid artery were determined in the temperature range 233～293K; the results show that there exists a significant difference between pure ice and frozen tissues below zero temperature.

关 键 词：生物组织 导热系数 测量方法 233-293K温区 热敏电阻 生物热物性 测量原理 

分 类 号：Q65[生物学—生物物理学] Q6－33