欧美日韩精品-亚洲精品999-国产在线视频一区-国产刺激高潮av-超碰人人澡-国产九九精品-成人特级毛片-亚洲www啪成人一区二区麻豆-黄免费视频-黄色免费在线看-羞羞草视频-999资源站-欧美中文字幕在线播放-这里只有久久精品-亚洲爱爱爱

產品列表PRODUCTS LIST

首頁 > 測試服務 > TC3000 Thermal Conductivity
TC3000 Thermal Conductivity
點擊次數:3142 更新時間:2014-09-01

 

Thermal conductivity measuring methods can be divided into steady-state method and non-steady-state method by macroscopic mechanism of thermal conductivity. 

Steady-state method requires long period ,and there are also many other factors which affect measuring accuracy. However, non-steady-state method has the advantage of short measuring time, high accuracy and low requirements for operational environment. Especially, the transient hot-wire method has been considered internationally as the best measuring method of thermal conductivity in the research area of thermal conductivity.

 

Measuring Principle

The origin of hot-wire method could be traced back to the year 1780 when an American scientistJoseph Priestley made the first experiment about heat transfer ability of air. In 1931,Stâlhane and Pyk, who are the first to adopt transient hot-wire method in measuring the thermal conductivity of solid, powder and liquid,  Hot-wire method is now widely used in gas, liquid, solid, metal fusion and so on.