China Instrument Network Instrument R&D Recently, news from the National Natural Science Foundation of China, Professor Wang Dongning of China Metrology University and Professor Li Jianqing of the Macau University of Science and Technology led the joint report of their respective teams “Femtosecond Laser Preparation Micro Fiber Online/Inline Lab The Sensing Application Project was approved for the joint research fund project of the National Natural Science Foundation of China in 2016 and the Science and Technology Development Fund of Macau. Professor Wang Dongning’s team plans to obtain funding of nearly 2 million yuan.
Wang Dongning was selected as a special expert for the “Thousand Talents Program†in Zhejiang Province in 2014. In June 2015, he joined the Institute of Optoelectronics of China Measurement University. After entering the school, he set up a "femtosecond laser device and sensing" research team in a relatively short period of time to carry out the "femtosecond laser microfabrication of fiber optic devices and sensing" "optical fiber comb" "volatile organics / gas "Optical fiber sensing" and other directions research. Since its establishment, the team has participated in one national key basic research and development project, undertook 1 project of the National Natural Science Foundation of China, 1 project of the Youth Fund, and 1 project of the Natural Science Foundation of Zhejiang Province. It has been published in the past two years (including acceptance ) Nearly 20 papers in the second district or above of SCI of the Chinese Academy of Sciences, applying for more than 10 patents, and directing graduate students to publish 1 paper in Scientific Reports (IF 5.228) magazine.
It is reported that in recent years, high-level talents such as the “Thousand Talents Program†special experts and the “Qianjiang Scholars†specially appointed professors from China Metrology University have adapted to the new working environment in a relatively short period of time and have formed a number of achievements.
(Original title: China Metric University team was supported by the National Fund)
U Tube Heat Exchanger
U tube heat exchanger is suitable for the large temperature difference between tube side and shell side. The shell side media is easy to scale and needs cleaning, while the tube side media is clean and not easy to scale. It is also suitable for high temperature, high pressure, fluid corrosive working conditions.
Each heat exchange tube is bent into U-shape, the two ends are fixed in the upper and lower areas of the same Tube Sheet, and divided into two chambers of inlet and outlet with the partition in the tube box. This kind of heat exchanger completely eliminates the thermal stress, the structure is simpler than the floating type, but the tube side is not easy to clean.
The number of tubes is small, the utilization of the tube sheet is not frequent, and the shell side fluid is easy to short circuiting, which is unfavorable to heat transfer. If there is a leak or damage in the tube, the external U-tube can be replaced, while the broken inner tube can not be replaced, only plugged, and one broken U-tube means two broken, so the U-tube easily scrapped.
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