Curriculum Vitae. Education Background

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Curriculum Vitae Hu ZHANG MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi an Jiaotong University, Xi an, 710049, China Mechanical Engineering,

1 Curriculum Vitae Hu ZHANG MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi an Jiaotong University, Xi an, , China Mechanical Engineering, University of Minnesota, MN, 55455, USA or Mobile: (China) (USA) Education Background 2014/11 present 2009/09 present 2005/ /07 Visiting Scholar, Mechanical Engineering, University of Minnesota Ph.D. Candidate, Engineering Thermodynamics, Xi an Jiaotong University, China Supervisor: Prof. Wen-Quan Tao. Bachelor, Energy & Power Engineering, Xi an Jiaotong University, China Research Interests Thermal property measurement and accuracy analysis Thermal insulation evaluation of aerogels composite materials and foaming materials at various environments. Water vapor adsorption on porous materials. Heat transfer mechanism and thermal insulation optimizing of porous materials. Heat transfer and fluid flow characteristics of heat exchanger. Research Experiences 1 Build an experiment rig of measuring thermal conductivity by using transient plane source method. The thermal conductivity measurement is conducted by Hot Disk constant analyzer (2500S, Sweden) which is based on transient plane source method. The

2 apparatus shows in Fig. 1 could carry out thermal conductivity measurement in following environment: Atmospheric environment: -70 to 200. Humidity environment: RT (room temperature) to 90 &RH (relative humidity) 15% to 90%. Controlled atmosphere environment: RT to 800 & 0.01Pa to 1MPa & N 2, Ar, etc. I carried out the thermal conductivity measurement of porous materials at different gas pressure using transient plane source method, seemingly, first in the literature. Fig. 1 Test rig of thermal conductivity measurement 2 Theoretical accuracy of the thermal conductivity measured by transient plane source method The transient plane source method has been adopted widely to measure thermal conductivity of bulk specimen of solid, powder, porous material and liquid. It is also used to measure thermal conductivity of slab specimen, film specimen and even anisotropic thermal conductivity and specific heat capacity. However, the transient plane source method has an assumption of plane source and it implies that no heat is dissipated through the sensor side. The complexity of theory of TPS method makes it difficult to obtain the deviation brought by the theoretical assumption. Numerical simulation is adopted to reveal the theoretical accuracy introduced by the assumption of the theory model by mimicking the heat transfer process of experiment and this method is named numerical experiment. The difference between numerical experiment and practical experiment is the thermal property of the test materials are given beforehand in the numerical experiment. The temperature of the heat source is monitored in the simulation and then the thermal conductivity can

3 be calculated according to the TPS theory. If the calculated thermal conductivity is identical with the given value, there has no error brought by the theoretical assumption of TPS. Otherwise, the difference between the given value and the calculated value obtained from the simulation represents the theoretical measurement error of TPS method. This simulation procedure of determining the theoretical accuracy is illustrated in Fig. 2. Fig. 2 Flow chart of the simulation. The numerical experiment method is performed successfully to obtain the theoretical accuracy of TPS method when determining isotropic thermal conductivity of bulk specimen and film specimen and anisotropic thermal conductivity of bulk specimen. The manufacturer Hot Disk is very interested with my research and invited me to give a presentation to the national Hot Disk users of China and they also take my advice to improve their instrument. 3 Thermal conductivity measurement of silica nano-porous materials with different component at different atmosphere Silica porous materials have a large number of hydroxyl groups on the inner surface of the material introduced during the manufacturing process which will absorb water vapor from the air. As a result, the thermal insulation performance will be drastically deteriorated when they are stored or used under a humid atmosphere. The kinetics of water vapor adsorption on the inner surface of silica nano-porous materials have been experimentally investigated based on the gravimetric method under different temperature and relative humidity. The influences of temperature and relative humidity on adsorption capacity and thermal conductivity of silica

4 nano-porous materials are characterized quantitatively in a wide range of temperature and humidity. 4 Influences of material components and environment factors on the thermal insulation of nano-porous materials The utilization of pure areogels is limited by brittle skeleton and transparency to thermal radiation. Reinforced fibers and opacifier are usually added in aerogels to improve the mechanic property and thermal property at high temperature. The thermal conductivity of a large number of nano-porous materials with different porosity, different volume fraction of fibers, different types, size and volume fraction of opacifier are studied experimentally to obtain the optimizing thermal insulation. The thermal conductivity of nano-porous materials varies with the temperature, atmosphere and gas pressure and these environment factors are experimentally investigated in detail. 5 Thermal conductivity measurement of foaming materials Foaming materials manufactured by polyurethane reaction using different polymer foaming agent such as pentamethylene (CP), isopentane (IP) and perfluoropropane (HFC-245fa) are widely used in refrigerators. The thermal conductivity of such kind of materials is measured at different temperature and relative humidity. The results are used to predict the overall energy consumption of refrigerator at different operating environment and to optimize the thermal insulation of foaming materials 6 Heat transfer and fluid flow characteristics of heat exchanger The heat transfer and fluid flow characteristics of core-blocked tubes with straight and corrugated longitudinal fin in annular space and plate-fin heat exchanger are measured using wind tunnel apparatus. Publications Journal Papers: [1] Hu Zhang, Yu Jin, Wei Gu, Zeng-Yao Li, Wen-Quan Tao. A Numerical Study on the Influence of Insulating Layer of the Hot Disk Sensor on the Thermal Conductivity Measuring Accuracy [J]. Progress in Computational Fluid Dynamics, 2013, 13(3/4): [2] Hu Zhang, Ming-Jia Li, Wen-Zhen Fang, Dan Dan, Zeng-Yao Li, Wen-Quan, Tao. A numerical study on the theoretical accuracy of film thermal conductivity using transient plane source method [J]. Applied Thermal engineering, 2014,72(1):62-69.

5 [3] Hu Zhang, Wei Gu, Ming-Jia Li, Zeng-Yao Li, Wen-Quan Tao. Experimental study on the kinetics of water vapor sorption on the inner surface of silica nano-porous materials [J]. International Journal of Heat and Mass Transfer, 2014, 78: [4] Hu Zhang, Wei Gu, Ming-Jia Li, Wen-Zhen Fang, Zeng-Yao Li, and Wen-Quan Tao. Influence of Environmental Factors on the Adsorption Capacity and Thermal Conductivity of Silica Nano-porous Materials [J]. Journal of Nanoscience and Nanotechnology, 2015, 15(4), [5] Dan Dan, Hu Zhang, Wen-Quan Tao. Effective Structure of Aerogels and Decomposed Contributions of its Thermal Conductivity [J]. Applied Thermal Engineering, 2014, 72(1):2-9. [6] Lei Chen, Hu Zhang, Zhong-Zhen Li, Ya-Ling He, and Wen-Quan Tao, Experimental and Numerical Study on Thermal Conductivity of Proton Exchange Membrane[J]. Journal of Nanoscience and Nanotechnology, 2015, 15(4), [7] Yong-Cun Zhou, Lu Wang, Hu Zhang, Yuan-Yuan Bai, Yu-Juan Niu, Hong Wang. Enhanced high thermal conductivity and low permittivity of polyimide based composites by core-shell nanoparticle fillers [J]. Applied Physics Letters, 2012, 101(1):012903(1-4). [8] Yong-Cun Zhou, Hong Wang, Feng Xiang, Hu Zhang, Ke Yu, Liang Chen. A poly (vinylidene fluoride) composite with added self-passivated micro- and nano-aluminum particles for enhanced thermal conductivity [J]. Applied Physics Letters, 2011, 98(18):182906(1-3). [9] Hu Zhang, Wen-Zhen Fang, Zeng-Yao Li, Wen-Quan Tao. Influence of gas heat conduction on the effective thermal conductivity of nano-porous materials. (Submitted to Journal). [10] Hu Zhang, Wen-Zhen Fang, Wen-Quan Tao. Thermal conductivity of polyurethane foams foamed by different blowing agent. (Submited to Journal) [11] Hu Zhang, Wen-Zhen Fang, Zeng-Yao Li, Wen-Quan Tao. Theoretical accuracy of anisotropic thermal conductivity determined by transient plane source method.(submited to Journal) Conference Papers: [1] Hu Zhang, Wei Gu, Ming-Jia Li, Zeng-Yao Li, and Wen-Quan Tao. The influence of temperature and humidity environment on the adsorption capacity and thermal insulation performance of silica nano-porous materials. The 4th International Symposium on Micro and Nano Technology, October 8-12, 2013, Shanghai, China.

6 [2] Hu Zhang, Ming-Jia Li, Wen-Zhen Fang, Dan Dan, Zeng-Yao Li, Wen-Quan, Tao. A Numerical Study on the Thermal Conductivity Accuracy of Thin Film Specimens Using Transient Plane Source Method. Asian Symposium on Computational Heat Transfer and Fluid Flow , June 3 6, 2013, Hong Kong, China. [3] Hu Zhang, Zeng-Yao Li, Dan Dan, Yun-Han Li, Mu Du, Wen-Quan Tao. Experimental and theoretical studies on the gas thermal conductivity in nano-porous materials. 23rd International Symposium on Transport Phenomena, November 19 22, 2012, Auckland, New Zealand. [4] Hu Zhang, Yu Jin, Wei Gu, Zeng-Yao Li, Wen-Quan Tao. A Numerical Study on the Influence of Insulating Layer of the Hot Disk Sensor on the Thermal Conductivity Measuring When Using Transient Plane Source Method. The Asian Symposium on Computational Heat Transfer and Fluid Flow , September 22 26, 2011, Kyoto, Japan. [5] Dan Dan, Hu Zhang, Wen-Quan Tao. Studies on Effective Model and Effective Thermal Conductivity of Aerogels. The Asian Symposium on Computational Heat Transfer and Fluid Flow , June 3 6, 2013, Hong Kong, China. [6] Zong-Liang Fan, Hu Zhang, Ming-Jie Li, Wen-Quan Tao. A Study on Heat Transfer Characteristics of Core-Blocked Tubes with Straight and Corrugated Longitudinal Fin Annular Space. International Workshop on Heat Transfer Advance for Energy Conservation and Pollution Control. October 17-20, 2011, Xi an, China. [7] Wei Gu, Hu Zhang, Zeng-Yao Li, Wen-Quan Tao. Application of Maxwell-Stefan Approach on Simulating the Mass Transport Process of Humid Air in Compound Silica Aerogel. The Asian Symposium on Computational Heat Transfer and Fluid Flow , September 2011, Kyoto, Japan.

Study on form distribution of soil iron in western Jilin and its correlation with soil properties

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