使用瞬态热线技术测量液体和气体的性质。

Measurement of the properties of liquids and gases using a transient hot-wire technique.

作者信息

Parsons J R, Mulligan J C

机构信息

Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27650, USA.

出版信息

Rev Sci Instrum. 1978 Oct;49(10):1460. doi: 10.1063/1.1135287.

DOI:10.1063/1.1135287

PMID:18698975

Abstract

A transient method of making simultaneous, in situ measurements of the thermal conductivity, volumetric specific heat, and kinematic viscosity of liquids and gases is presented. The technique utilizes the temperature response record of a fine horizontal wire, functioning as a resistance thermometer, when subjected to a sudden and constant electrical heating. It is shown that a formulation of the transient mechanisms governing the transition from pure conductive to free convective heat transfer from the wire can be used to produce simultaneous determinations of fluid properties from a single wire temperature versus time record. A simple apparatus is presented, along with the results of its use in determining the properties of air.

摘要

本文提出了一种瞬态方法，用于同时原位测量液体和气体的热导率、体积比热容和运动粘度。该技术利用一根细水平金属丝作为电阻温度计，在受到突然且恒定的电加热时的温度响应记录。结果表明，从金属丝纯传导传热到自由对流换热的瞬态机制公式，可用于根据单根金属丝温度随时间的记录同时测定流体性质。文中介绍了一种简单的装置，以及其用于测定空气性质的结果。