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2. 测试方法研究动态
发布时间:2014-04-29 09:14:22 点击浏览:


一、热导率测试新技术研究动态


1 . 发动机冷却液及相关液体热导率和体积比热容新型测试方法(瞬态热线法)研究



有效的发动机冷却系统是保障任何车辆和交通运输工具正常运转的最基本组成部分。近些年来,无水发动机冷却剂已经逐渐成为冷却系统的一个重要选择。为了评价这种创新技术和鼓励相应的标准化,美国ASTM中负责发动机冷却剂和相关液体的D15国际委员会在2010年建立了D15.22无水冷却剂分会。D15.22无水冷却剂分会的重点研究内容之一就是建立一种新型标准测试方法,来准确测量冷却液、无水冷却液和其他相关液体的热导率、热扩散率和体积比热容,这种新型标准测试方法基本选定为瞬态热线法。

对应的研究项目名称为:ASTM WK34987 - New Test Method for Thermal Conductivity, Thermal Diffusivity, and Volumetric Heat Capacity of Engine Coolants and Related Fluids by Transient Hot Wire Liquid Thermal Conductivity Method


2 .
ASTM热测量委员会正在拟订瞬态平面热源法和HOTDISK法标准测试方法(2014年7月29日)



A proposed new ASTM International standard will aid in understanding thermal transport properties, an important component in optimizing the energy efficiency of building materials and improving thermal design in electronics, fuel cells and batteries.

The test described in ASTM WK46204, Test Method for Determination of Thermal Conductivity and Thermal Diffusivity of Solids and Fluids Using the Transient Plane Source or Hot Disc Method, can be designed to match different specimen sizes and to allow for measurements to be made in gaseous and vacuum environments at a range of temperatures and pressures. The test can be conducted on a wide range of materials with limited effort required for sample preparation. Solid-state components made from materials such as composites, single-phase and granular material can be tested. In addition, testing per ASTM WK46204 can also be performed on liquids from low-viscosity fluids to high-viscosity plates.

“ASTM WK46204 will most likely be used by laboratories developing or modifying new materials and studying how specific materials behave at different temperatures and pressures,” says ASTM member Mattias Gustavsson, Ph.D., CEO of Hot Disk AB. “The proposed standard will be useful for applications and quality control testing in the pharmaceutical, automobile and aviation industries.”

Gustavsson cites three main ways in which ASTM WK46204 will be used once it has been approved:

• Development or assessment of thermally insulated materials;

• Development or assessment of thermally conductive materials or composite structures; and

• Empirically connecting hot disc test results with variations in structural constitution of a material.

ASTM WK46204 is being developed by Subcommittee E37.05 on Thermophysical Properties, part of ASTM International Committee E37 on Thermal Measurements. All interested parties are welcome to join in the standards developing activities of E37.


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