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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 ...

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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Simulation of hemodynamics in portal vein hypertension using CFD

Simulation of hemodynamics in portal vein hypertension using...

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第五届中美生物医学工程暨海内外生物力学学术研讨会

作者： Xiao Li Yansong Pu Peng Nie Zongfang Li Bin Chen State Key Laboratory of Multiphase Flow in Power Engineering.Xi'an Jiaotong University Second Affiliated Hospital.Xi'an Jiaotong University Department of Radiology Huaihe Hospital of Henan University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

＜正＞Introduction Liver cirrhosis generally occurs with the hemodynamic changes during the portal vein hypertension and finally leads to the atrophy of the right lobe of the liver and hepatic *** to the hemodynamic changes,a hypothesis has been proposed that the liver volume is related to the istribution of blood from the splenic vein（SV） that involves nutrition from spleen and pancreas The objective of the present paper is to simulate the blood flow in real models of portal vein hypertension and validate the hypothesis using computational fluid dynamics （CFD） method.

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An experimental study on the droplets dynamics of flashing spray with R134a

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2013年第1期34卷 87-90页

作者： Zhou, Zhi-Fu Wu, Wei-Tao Wang, Guo-Xiang Chen, Bin Wang, Yue-She State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Mechanical Engineering University of Akron Akron Ohio 44325-3903 United States

Flashing spray is a common phenomenon which finds many applications in the industry, such as flash-spray internal combustion engine, distillation of salt water by flashing evaporation, cryogen spray cooling in dermatology. In order to improve the understanding of atomization mechanism, this paper presents an experimental investigation to the droplets dynamics in the R134a flashing spray including the variations of droplets diameter and velocities. The droplets diameter, droplets axial velocity and radial velocity at different locations are simultaneously measured by the PDPA system. The PDPA measurements data find that both the non-dimensional velocities show self-similar profile. Two empirical equations have been proposed to describe the non-dimensional velocities.

关键词： Velocity

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Experimental studies on the enhanced flow boiling heat transfer and pressure drop of organic fluid with high saturation temperature in vertical porous coated tube

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AIP Conference Proceedings 2013年第1期1547卷 442-453页

作者： Dong Yang Zhi Shen Tingkuan Chen Chenn Q. Zhou State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 710049 Xi'an China Department of Mechanical Engineering Purdue University Calumet Hammond IN 46323 USA

The characteristics of flow boiling heat transfer and pressure drop of organic fluid with high saturation temperature in a vertical porous coated tube are experimentally studied in this paper. The experiments are performed at evaporation pressure of 0.16-0.31MPa, mass flux of 390-790kg/m2s, and vapor quality of 0.06-0.58. The variations of heat transfer coefficient and pressure drop with vapor quality are measured and compared to the results of smooth tube. Boiling curves are generated at mass flux of 482 and 675kg/m2s. The experimental results indicate that the heat transfer coefficients of the porous tube are 1.8-3.5 times those of smooth tube, and that the frictional pressure drops of the porous tube are 1.1-2.9 times those of smooth tube. The correlations for heat transfer coefficient and frictional pressure drop are derived, in which the effect of fluid molecular weight is included. The experiments show that significant heat transfer enhancement is accompanied by a little pressure drop penalty, the application of the porous coated tube is promising in the process industries.

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