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作者： Cheng, Lixin Liu, Lei School of Engineering University of Portsmouth Anglesea Building Anglesea Road Portsmouth PO1 3DJ United Kingdom State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China

The study of refrigerant-based nanofluid boiling and two-phase flow phenomena is still in its infancy. This field of research provides many opportunities to study new frontiers but also poses great challenges. To summarize the current status of research in this newly developing interdisciplinary field and to identify the future research needs as well, this paper presents a comprehensive review of nucleate pool boiling, flow boiling, condensation and two-phase flow of refrigerant-based nanofluids. The effects of nanolubricants on boiling and two phase flow phenomena are presented as well. Furthermore, studies of applications and challenges of refrigerant-based nanofluids are presented and future research needs are identified. For the limited studies done so far, there are some controversies from one study to another. Conclusions and contradictions on the available refrigerant-based studies of physical properties, boiling and two phase flow are presented. According to this review, it has been realized that the physical properties have significant effects on the refrigerant-based nanofluid boiling and two-phase flow characteristics but the lack of the accurate knowledge of these physical properties has greatly limited the study in this interdisciplinary field. Furthermore, the limited available experiments and quite contradictive results have limited the understanding of the fundamentals of boiling and two phase flow phenomena. flow regimes are very important in understanding the phenomena but less investigated so far. Apparently it is still a long way to go to achieve systematic fundamental knowledge and theory in the relevant subject. Therefore, effort should be made to contribute to the physical property database of nanofluids as a first priority. Secondly, systematic accurate experiments and flow regime observations on boiling and two-phase flow phenomena under a wide range of test conditions and nanofluid types should be emphasized to understand the fundamentals.

关键词： Two phase flow

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Effect of anolyte pH and cathode Pt loading on the performance of novel MFC for electricity and hydrogen coproduction

Effect of anolyte pH and cathode Pt loading on the performan...

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第五届世界氢能技术大会(WHTC2013)

作者： Ya-Peng Liu Yun-Hai Wang Bai-Shi Wang Qing-Yun Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

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Synthesis and characterization of Cu2MS4（M=W or Mo） prepared by hydrothermal method

Synthesis and characterization of Cu2MS4（M=W or Mo） prepar...

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International Conference on Nanoscience & Technology,China 2013(ChinaNANO 2013)

作者： Huirong Liang Mingtao Li Liejin Guo Xi'an Shiyou University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

The synthesis and properties of metal chalcogenides have been extensively researched because of their useful and novel properties. Most of them have been synthesized by traditional high-temperature calcination methods. However, other preparation methods have also been investigated such as solvothermal synthesis method. Pruss et al synthesized layered Cu 2 WS 4 materials with square primitive lattices by using Cu(CH 3 CN) 4 BF 4 and [NH 4 ] 2 WS 4 with the solvothermal method in 1993. Later Crossland group reported the synthesis and characterization of this kind of copper tetrathiometallide materials. In this paper, a new synthesis method of Cu 2 MS 4 ( M = W or Mo) polycrystal was proposed. Cu 2 MS 4 ( M = W or Mo) materials were prepared under the different reaction conditions by hydrothermal synthesis method, the structure of which has been solved from powder X-ray diffraction data, and the scanning electron microscope photographs of which were taken using an JEOL JSM-6700. [NH 4 ] 2 WS 4 crystal and CuCl 2 were used as the raw materials to produce Cu 2 WS 4 crystal. The prepared Cu 2 WS 4 semiconductor crystallizes in space group I-42m with cell parameters a = b = 5.4454 (3) , c = 10.0671(7) . [NH 4 ] 2 MoS 4 crystal, CuCl and ammonia were used as the raw materials to prepare Cu 2 MoS 4 crystal. The Cu 2 MoS 4 material crystallizes in space group I-42m with cell parameters a = b = 5.4087(7) , c = 10.0428(2) . Cu 2 MS 4 ( M = W or Mo) polycrystal contains layers of edge-sharing MS 4 and CuS 4 tetrahedra separated by a van der Waals gap.

关键词： hydrothermal synthesis, polycrystal, nano materials, chalcogenide.

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Spray Characteristics and Heat Transfer Dynamics of Cryogen Spray Cooling for the Laser Dermatology

Spray Characteristics and Heat Transfer Dynamics of Cryogen ...

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2nd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control(IWHT2013)(2013年第二届节能减排传热进展国际研讨会)

作者： Bin Chen Zhifu Zhou Guoxiang Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong University Xi''an 710049 China

Cryogen spray cooling (CSC) can be used in laser dermatology to prevent burning injury of skin during *** uses a short spurt of (40 ~100 ms) on the skin surface before laser irradiation, leading to quick reduction in ... 详细信息

关键词： Cryogen spray cooling laser dermatology Spray characteristics Heat transfer dynamics

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Experimental investigation on phase change spray cooling with R22

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AIP Conference Proceedings 2013年第1期1547卷 531-536页

作者： Mengjing Li Jionghui Liu Xiufang Liu Yu Hou School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Great quantities of experiments were performed to study the effects of two-phase spray cooling with high heat flux used R22 as refrigerant. A detailed research of the performance of spray cooling at different subcooling temperature was conducted. The experimental results show that the critical heat flux can reach 272.04W⋅cm−2 with R22 as the working medium, and the corresponding surface temperature is 21.11°C These figures prove that the spray cooling has the advantages of high heat flux as well as lower surface temperature. With increasing overcooling degree of refrigerant at the entrance of nozzle, CHF rises at first and goes to stable then. Which means the CHF can be developed by adding the overcooling of refrigerant. However, the development is limited to a certain degree according to the characteristics of the system; namely, the overmuch increment plays a little role to improve CHF value.

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Hydrodynamic simulation of gas solid two phase flow in a flat-bottom multiple-spouted bed

Hydrodynamic simulation of gas solid two phase flow in a fla...

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The 7th Sino-US Conference of Chemical engineering(第7届中美化学工程会议)

作者： Yongchao Li Xiaoming Wu Huan Wang Defu Che State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi''an Jiaotong UniversityXi''an 710049China

In present work,the gas-solid two-phase flow in a flat-bottom multiple-spouted bed is simulated by the Eulerian-Eulerian *** kinetic theory of granular flow is used to close the equations,and the Johnson & Jac... 详细信息

关键词： multiple-spouted bed flat-bottom hydrodynamics simulation voidage two-fluid model KTGF theory

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Synthesis and characterization of Cu2MS4 (M =W or Mo) prepared by hydrothermal method

Synthesis and characterization of Cu2MS4 (M =W or Mo) prepar...

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International Conference on Nanoscience & Technology,China 2013(ChinaNANO 2013)(中国国际纳米科学和技术大会)

作者： Huirong Liang Mingtao Li Liejin Guo Xi''an Shiyou University Xi''an 710061China State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong UniversityXi''an 710049China State Key Laboratory of Multiphase Flow in Power EngineeringXi''an Jiaotong UniversityXi''an 710049China

The synthesis and properties of metal chalcogenides have been extensively researched because of their useful and novel *** of them have been synthesized by traditional high-temperature calcination ***, other preparati... 详细信息

关键词： hydrothermal synthesis polycrystal nano materials chalcogenide

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Investigation on deflagration behaviors of oil and natural gas boiler and analysis of deflagration prevention

Investigation on deflagration behaviors of oil and natural g...

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International Conference on power engineering 2013, ICOPE 2013

作者： Li, Lian Li, Hui Li, Na Zhou, Qulan Shen, Jizhao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China China Nuclear Power Design Co. Ltd. Shenzhen518057 China Yangzhou Chenguang Special Equipment Co. Ltd. Yangzhou225800 China

For the investigation on deflagration of oil/natural gas boiler and its prevention, an experimental system was designed and built to measure deflagration characteristics of combustible gas. The explosion limits of methane and its mixture of CO were measured at different temperature. The results matched the theoretical values well. It was also found that the range of explosion limit widens with an increase of initial temperature or a rise of CO rate, which indicates that incompletely burned methane causes high risk of deflagration. The possibility of deflagration, which may happen during purging, was numerically analyzed. Igniting without purging after flameout increases the possibility of deflagration. The result of unsteady numerical modeling on purging shows that ignition should be done rapidly within 5 minutes and purging is necessary before sparking again. The amount of purging air to ensure safety is 4 times of the furnace volume.

关键词： Purging

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Pool boiling heat transfer and bubble dynamics over micro-pin-finned surface under microgravity

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2013年第11期34卷 2112-2115页

作者： Zhang, Yong-Hai Xue, Yan-Fang Wei, Jin-Jia Zhao, Jian-Fu Long, Yan Qi, Bao-Jin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China /CAS Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China

For high-efficiently solving the power dissipation problem of electronic components on the spacecraft, experiments were performed using micro-pin-finned structure as heater surface in subcooled nucleate pool boiling of FC-72 under microgravity condition utilizing the drop tower Beijing. Micro-pin-fins with the dimensions of 50 μm×120 μm (thickness × height) were fabricated on the surface of square silicon by using the dry etching technique. The micro-pin-finned silicon chip was heated by means of controlling heating voltage for the desired heat flux. At the same time, video of the bubble behavior was obtained by using high speed camera. The results showed that micro-pin-fins can increase the effective nucleate boiling sites number and the heat transfer performance efficiently, which stems from the sufficient supply of fresh liquid to the heater surface due to the capillary force independent of gravity. The steady nucleate pool boiling heat transfer on micro-pin-finned surface can be obtained at high heat fluxes and is greatly enhanced compared with smooth surface in microgravity.

关键词： Microgravity

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Calculation of the Critical Speed and Stability Analysis of Cryogenic Turboexpanders with Different Structures

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Plasma Science and Technology 2012年第10期14卷 919-926页

作者：陈双涛赵红利马斌侯予 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

A modularized code based on the Finite Element QZ （FEQZ） method is developed, for a better estimate of the critical speed and a more convenient method of rotor-dynamic stability analysis for a gas bearing high speed turboexpander rotor system with actual structure and application of a cryogenic turboexpander. This code is then validated by the experimental data of a gas bearing turboexpander, with a rotor diameter of 25 mm and a rated speed of 106,400 rpm. With this code, four rotors with different structures, available to the turboexpander, are parametrically analyzed by the available speed range, vibration modes and logarithmic attenuation rate. The results suggest that the rotor with a structure of two thrust collars on the system exhibits a better performance in the designed conditions.

关键词： critical speed gas bearing cryogenic turboexpander

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