国产精品久久久久久久久免费看-99re国产-精品多人p群无码-久久精品人人做人人爽电影蜜月-久久99国产乱子伦精品免费-美女久久久久久久-狠狠色综合激情丁香五月-91国自啪-国产第|页日本草草影院一-亲近乱子伦免费视频无码-精品一区二区三区久久久-成熟丰满熟妇高潮xxxxx视频-97色在线观看-欧美五月-在线不卡的av

產(chǎn)品列表PRODUCTS LIST

首頁 > 測試服務(wù) > TC3000 Thermal Conductivity
TC3000 Thermal Conductivity
點擊次數(shù):3148 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.