Research Fields
High intensity heat transfer and advanced measurement of thermal properties.
Research Orientations
1. Close-loop high intensity heat transfer mechanisms and their application: no-air cooling technology of turbine blades.
2. Efficient heat management technology: micro-scale flow, high performances phase change intensified heat transfer mechanisms and efficient heat management.
3. Advanced heat transfer and heat storage characteristic measurement and mechanism research: micro/nano structure material heat transfer mechanisms and their application.
Organization and Personnel
At present the Center has 20 employees, including 2 research professors, 8 associate research professors, and 10 assistant research professors. There are 12 students including 8 PhD students, and 4 master’s students.
Projects in 2013
The Center won a total of 15 projects in 2013. Basic research projects had a strong showing, garnering 5 National Natural Science Foundations of China (NSFC) projects, including 1 major project, 2 general projects, and 2 youth projects. One national major scientific instruments and equipment development project, 2 non-civil projects, 5 joint projects by CAS and the local governments, and 2 enterprise-commissioned projects.
Major Progress and Achievements in 2013
This year, key research projects on high-intensity close-loop cooling technology of turbine blades were in a pivotal stage. We finished the annual goals of frontier exploration projects. The research also got new CAS funding. This research was composed of four correlative tasks: the design of blade cooling structure, study on high intensity heat transfer mechanisms, development of high-temperature working fluid filling systems, and blade design and building experimental test platforms. After a year of hard research, we achieved a breakthrough and completed the planned goals, as follows: 1. We experimentally verified the feasibility of the closed high-strength cooling technology of turbine guide vanes
with liquid Na-K alloy as the working fluid; 2. The mechanism research justified the rational of high-strength hot-press transform mechanisms, showing the intrinsic relationship between the working fluid filling volume and the scope of effect, and laid a theoretical basis for the calculation of the heat transfer.
We obtained financial support provided by the Key Project of National Natural Science Foundation of China (NSFC) and the MOST Significant Development Project of Special Scientific Equipment for advanced thermal property measurement techniques and nano heat transport mechanisms. We have made significant progress in the study of heat transport mechanisms of nano-carbon materials. The thermal conductivity of general purpose grade polyacrylonitrile (PAN)-based carbon fiber with different degrees of graphitization was studied using the 3ω method. It was found that the lattice thermal conductivities of the fibers are linearly dependent on the reciprocal of in-plane coherence length 1/La. The underlying mechanism of the influence of nanostructures on the thermal transport was revealed through phonon scattering theory and a quantitative formula was given, obtaining a universal formula for estimating the point-defect scattering constant for the carbon fibers investigated. Based on this formula, the point-defect scattering information for purpose grade PAN-based carbon fiber can be estimated from the in-plane coherence length La and the lattice thermal conductivity. The cross-plane thermal conductivity of hybrid organic−inorganic materials were measured using the femto-second laser time-domain thermo-reflectance method. We found out that the thermal conductivity of hybrid ALD (Atomic layer deposition)−MLD (molecular layer deposition) thin films was below 0.2 W/mK, which was much smaller than those of any other solid materials reported. As a result, such ALD/MLD-enabled hybrid organic−inorganic materials could be promising thermal insulation materials or even high-efficiency thermoelectric materials due to the expected low thermal conductivity.
The research on microscale phase-change enhancement heat transfer technology won 2 new NSFC Foundation awards in this year. The LED cooling application project forged a collaborative research group with an enterprise. The design of a mass production process of LED radiators was completed. We continued to maintain a good working relationship with the nine top power laser thermal management institutions. The annual tasks of the 863 Program were completed with high-quality, and a hundred watt solid phase change cooler pump source sample was developed.
Fifty three papers were published in the year 2013, including 25 indexed by SCI, and 31 by EI. One chapter of English monograph was published. Nine national invention patents and 7 utility model patents were applied for, and 3 national invention patents were authorized.
Dean: Tang Dawei Tel:010-82543020 E-mail: dwtang@iet.cn
Deputy Dean: Jiang Yuyan Tel:010-82543179 E-mail: yyjiang@iet.cn
