97无码免费人妻超级碰碰夜夜,声声奶酥1V办公室,158午夜青青在线播放,久久亚洲精品国产精品紫薇,少妇白洁小说在线阅读,亚洲最大无码的av网站,家庭乱校园春色亚洲传媒,亚洲一级毛片无码无遮挡,久久国产综合精品欧美精品

產品列表PRODUCTS LIST

首頁 > 測試服務 > TC3000 Thermal Conductivity
TC3000 Thermal Conductivity
點擊次數:2541 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.