RELATIONSHIP BETWEEN THERMAL-DIFFUSIVITY AND MEAN FREE-PATH

被引：7

作者：

YANG, G ^{[1
]}

MIGONE, AD ^{[1
]}

JOHNSON, KW ^{[1
]}

机构：

[1] SO ILLINOIS UNIV,MOLEC SCI PROGRAM,CARBONDALE,IL 62901

来源：

AMERICAN JOURNAL OF PHYSICS | 1994年 / 62卷 / 04期

关键词：

D O I：

10.1119/1.17580

中图分类号：

G40 [教育学];

学科分类号：

040101 ; 120403 ;

摘要：

The thermal diffusivity is a parameter that determines the speed and attenuation of a thermal wave propagating through a material. In this paper we show, using the kinetic model for thermal transport, that the thermal diffusivity is also proportional to the mean free path of the heat carriers. Thus, the thermal diffusivity has the added feature of being directly related to an important transport property of the excitations that carry the heat. Thermal diffusivity and mean free path data are presented for an amorphous insulating solid, Pyrex 7740 glass, in the temperature range from 25 to 300 K.

引用

页码：370 / 372

页数：3

共 14 条

[1]

ANDERSON AC, 1981, TOPICS CURRENT PHYSI, V24, pCH5

[2] THERMAL-CONDUCTIVITY MEASUREMENT FROM 30-K TO 750-K - THE 3-OMEGA METHOD [J].