久久不射影院,亚州色综合,久久久久久久AB,一本大道AV人久久综合,岛国精品在线播放一区,亚洲国产精品无码久久久 ,亚洲色无码专区在线观看精品,色综合视频一区二区三区44

產品列表PRODUCTS LIST

首頁 > 測試服務 > TC3000 Thermal Conductivity
TC3000 Thermal Conductivity
點擊次數:3645 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.