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| 1 | Dynamic behaviors of cavitation bubble for the steady cavitating flow显示文摘In this paper, by introducing the flow velocity item into the classical Rayleigh-Plesset dynamic equation, a newequation, which does not involve the time term and can describe the motion of cavitation bubble in the steadycavitating flow, has been obtained. By solving the new motion equation using Runge-Kutta fourth order methodwith adaptive step size control, the dynamic behaviors of cavitation bubble driven by the varying pressure fielddownstream of a venturi cavitation reactor are numerically simulated. The effects of liquid temperature (correspondingto the saturated vapor pressure of liquid), cavitation number and inlet pressure of venturi on radial motionof bubble and pressure pulse due to the radial motion are analyzed and discussed in detail. Some dynamicbehaviors of bubble different from those in previous papers are displayed. In addition, the internal relationshipbetween bubble dynamics and process intensification is also discussed. The simulation results reported in thiswork reveal the variation laws of cavitation intensity with the flow conditions of liquid, and will lay a foundationfor the practical application of hydrodynamic cavitation technology. | Jun CAI,Xiulan HUAI and Xunfeng LIInstitute of Engineering Thermophysics,Chinese Academy of Sciences,P.O.Box 2706,Beijing 100190,China Professor | 2009 | Journal of Thermal Science2009，18，4： | 9 |
| 2 | 3D CFD modeling of acetone hydrogenation in fixed bed reactor with spherical particles显示文摘Acetone hydrogenation in a fixed bed reactor packed with spherical catalyst particles was simulated to study the effects of inlet gas velocity and particle diameter on hydrogenation reaction.Computational results show that the catalyst particles in the reactor are almost isothermal,and the high isopropanol concentration appears at the lee of the particles.With the increase of inlet velocity,the outlet isopropanol mole fraction decreases,and the total pressure drop increases drastically.Small diameter catalyst particles are favorable for acetone hydrogenation,but result in large pressure drop. | Xiaoming Zhou Yanjun Duan Xiulan Huai Xunfeng Li | 2013 | Particuology2013，11，6： | 7 |
| 3 | High Temperature Catalytic Hydrogenation of Acetone over Raney Ni for Chemical Heat Pump显示文摘Exothermic hydrogenation reaction of acetone is an important part of an IAH-CHP, and the performance of IAH-CHP is affected directly by this reaction. This paper studies the influence of space velocity, temperature, hydrogen flow rate and pressure on conversion and selectivity experimentally. The byproducts are analyzed and classified into three types: hydrogenation product, cracking products and condensation products. Both the conversion and selectivity of this reaction have the same trend with the change of space velocity, temperature and hydrogen flow rate, and has the opposite trend with the change of pressure. As the space velocity increases, the conversion curve is a gradual decline parabola but the selectivity curve is close to a straight line. Hydrogen flow rate has a more obvious influence on conversion than temperature, whereas on selectivity the situation is opposite. High pressure increases the conversion of acetone to all products, but the increment of byproducts is more than that of isopropanol, so the selectivity decreases as pressure increases. | DUAN Yanjun XU Min HUAI Xiulan | 2014 | Journal of Thermal Science2014，23，1： | 4 |
| 4 | Numerical simulation of spray performance based on the Euler-Lagrange Approach显示文摘Numerical simulations have been carded out to investigate the liquid atomization and spray process using theDiscrete Phase Model of the commercial CFD code combined with the Wall-Film boundary conditions. The effectsof spray parameters on droplets Santer mean diameter (SMD), droplet collision speed, the thickness of liquid-film,the surface temperature and its uniformity were analyzed in the present study. The simulation results andthe experimental data obtained in the available literature agree within 13.8%. The computational results show thatthe spray pressure is the main factor to realize the atomization. Increasing the mass flux and the spray pressure,the droplet collision speed increases while the corresponding maximum film thickness on the heated surface declines.The surface temperature changes indistinctively with the increase of the spray distance, but the temperaturedistribution tends to be uniform. | Yujia Tao Xiulan Huai Ziyi Guo Ran Yin | 2009 | Journal of Thermal Science2009，18，1： | 4 |
| 5 | Experimental and Numerical Study of an 80-kW Zigzag Printed Circuit Heat Exchanger for Supercritical CO_(2)Brayton Cycle显示文摘In this study,an experimental system was built to investigate the global performance of an 80-k W zigzag printed circuit heat exchanger(PCHE).It could meet the requirement of the pre-cooler for the supercritical carbon dioxide(S-CO_(2))Brayton power cycle and the modified effectiveness considering the pinch point is between 61.5%and 79.3%.When the outlet S-CO_(2)temperature is near the pseudo-critical point,the thermo-physical properties have more effects on heat transfer performance compared to flow characteristics.For the local performance,the mass flow rates of both sides have crucial influences on the location where the peak of S-CO_(2)Nusselt number occurs while only the S-CO_(2)flow rate affects the variation of the peak value.In addition,the influence of the radius of curvature on the secondary-flow should not be ignored.In the end,new empirical correlations were proposed considering the drastic variations of the Prandtl number. | ZHANG Huzhong CHENG Keyong HUAI Xiulan ZHOU Jingzhi GUO Jiangfeng | 2021 | Journal of Thermal Science2021，30，4： | 3 |
| 6 | Collection efficiency in a three-dimensional randomly arranged dual-layer granular bed filter显示文摘The dual-layer granular bed filter packed with randomly arranged granules was simulated to study the effects of bed depth of the lower layer of fine granules and the inlet gas velocity on the collection mechanism.The computational results show that the collection efficiency is much better from this granular bed than a single-layer granular bed,especially for particle diameters of 1-10μm.The inlet gas velocity has less effect on the grade collection efficiency of the dual-layer granular bed than of the single-layer granular bed.The dual-layer granular bed provides a high collection efficiency and low pressure drop.The relationship between the grade collection efficiency and the Stokes number(St)based on the inlet gas velocity is obtained.If St is below a threshold,the grade collection efficiency remains stable;if St is in value above threshold,the grade collection efficiency increases linearly with lg(St).As the bed depth of the lower layer of fine granules increases,the threshold for St shifts forward. | Junlin Chen Xunfeng Li Xiulan Huai Jingzhi Zhou | 2020 | Particuology2020，18，2： | 3 |
| 7 | CFD Study on Local Fluid-to-Wall Heat Transfer in Packed Beds and Field Synergy Analysis显示文摘To reach the target of smaller pressure drop and better heat transfer performance, packed beds with small tube-to-particle diameter ratio(D/dp<10) have now been considered in many areas. Fluid-to-wall heat transfer coefficient is an important factor determining the performance of this type of beds. In this work, local fluid-to-wall heat transfer characteristic in packed beds was studied by Computational Fluid Dynamics(CFD) at different Reynolds number for D/dp=1.5, 3.0 and 5.6. The results show that the fluid-to-wall heat transfer coefficient is oscillating along the bed with small tube-to-particle diameter ratio. Moreover, this phenomenon was explained by field synergy principle in detail. Two arrangement structures of particles in packed beds were recommended based on the synergy characteristic between flow and temperature fields. This study provides a new local understanding of fluid-to-wall heat transfer in packed beds with small tube-to-particle diameter ratio. | PENG Wenping XU Min HUAI Xiulan LIU Zhigang | 2016 | Journal of Thermal Science2016，25，2： | 3 |
| 8 | Visualization of Film Wavelike Characteristics and Measurement of Film Thickness in Spray Cooling显示文摘An experimental investigation was performed to study the heat transfer in an eight-nozzle spray cooling system with de-ionized water as the working fluid. Visualization of the liquid-solid contact area and the flow near the heated surface was made using a microscopic lens system in conjunction with an advanced high-speed camera. The film thickness and film wavelike characteristics under liquid volume flow rates ranged from 2.78×10 -6 m 3 /s to 1.39×10 -5 m 3 /s and surface temperatures between 22℃ and 78.2℃ were examined respectively. The development process of the liquid film on the heated surface was observed. The local mean film thickness, the film wavelike characteristics and the behavior of the bubbles appeared in the liquid film were captured using an image processing technique. It is discovered that there exists a climax of local mean film thickness during the starting process of spray cooling. When the liquid film reaches the dynamic stable state, the dimensionless mean film thickness decreases with the increase of the liquid volume flow rate, and increases with the increase of surface temperature generally. Besides, the volume flow rate has a more significant impact on the wavelength and amplitude of the liquid film compared to the surface temperature. | Yan Hou Yujia Tao Xiulan Huai | 2013 | Journal of Thermal Science2013，22，2： | 3 |
| 9 | A New Method for Analyzing Heat Exchangers- Matching of Temperature Field显示文摘In heat exchangers, the magnitude of Nu of each duct is influenced by the temperature field, since the ratio of heat capacity rate will influence the matching status of the temperature field between contacting ducts, the total heat transfer coefficient is related with the ratio of heat capacity rate. Considering this relationship, a new method for analyzing heat exchanger is proposed - matching of temperature field. First, for a single duct with the temperature field varying exponentially along the flow direction, its Nu is calculated. Then under the hypothesis that the thermal resistance of the wall is negligible, the matching condition was set like this: both the temperature and heat flux are equal for the hot and cold fluids at the wall, so the matching relationship of parameter that describes the temperature field of the hot and cold fluids, was obtained. Finally the relationship between the total Nu and the ratio of heat capacity rate along with the ratio of inherent thermal resistance is obtained. Compared with traditional analyzing methods, the temperature matching method can be used to get the total heat transfer coefficient directly, and also be used for optimization of heat exchanger design. For a parallel flow, the optimal ratio of heat capacity rate is reciprocal to the ratio of inherent thermal resistance, and for a counter flow, the optimal ratio of heat capacity rate is zero or infinity. | WANG HuanGuang HUAI XiuLan | 2012 | Journal of Thermal Science2012，21，5： | 2 |
| 10 | Effect of cavitating flow on forced convective heat transfer: a modeling study显示文摘With water as working medium,a numerical study on liquid convection heat transfer accompanied by cavitating flow in a circular tube was conducted by combining mixture model and Schnerr–Sauer cavitation mode in the commercial code,Ansys Fluent.Cavitation is instigated by setting a restriction orifice in the circular tube.The simulation results show that cavitation occurs around the wall of the restriction orifice and disappears at the downstream regions.The comparison of local heat transfer coefficients under the same mass flow rate indicates that,heat transfer is significantly augmented at the downstream regions of the restriction orifice because of the occurrence of cavitation.The analysis on the characteristics of cavitating and noncavitating flows confirms that the occurrence of cavitation can increase the turbulence intensity under the same mass flow rate,which is the origin for heat transfer to be enhanced.Based on it,the effects of such factors as inlet pressure and ratio of orifice to pipe diameter on cavitation enhanced heat transfer were further investigated for the purpose of application. | Jun Cai Xunfeng Li Bin Liu Xiulan Huai | 2014 | Chinese Science Bulletin2014，59，14： | 2 |
| 11 | Numerical study of collection efficiency and heat-transfer characteristics of packed granular filter显示文摘The collection mechanism and heat-transfer characteristics of a packed granular filter were investigated using a three-dimensional randomly packed granular filter model. The bridging method was introduced to optimize the grids of contact points between granules. The influences of granular bed depth, gas velocity, and gas temperature on grade collection efficiency were investigated. The results indicated that a decrease of temperature improved collection efficiency when the particle diameter was greater than 5 |xm. The grade collection efficiency maintained a stable value when the Stokes number, St, was less than 0.009, but increased linearly with ig(St) when St > 0.009. A logarithmic mean temperature difference method was used to obtain overall heat-transfer coefficients of gas-solid two-phase flow through the packed granular filter. The results showed that convective heat transfer was enhanced due to the intro-duction of solid particles in the bed. The overall heat-transfer coefficient increased approximately linearly with an increase in particle loading ratio. The Nusselt number was related to the Reynolds number, the Archimedes number, and the particle loading ratio. | Junlin Chen Xunfeng Li Xiulan Huai Yongwei Wang Jingzhi Zhou | 2019 | Particuology2019，17，5： | 2 |
| 12 | Study of turbulent heat transfer of aviation kerosene flows in a curved pipe at supercritical pressure显示文摘 | Xunfeng Li Fengquan Zhong Xuejun Fan Xiulan Huai Jun Cai | 2010 | Applied Thermal Engineering2010，，13： | 2 |
| 13 | Heat Transfer and Entropy Generation Analysis of an Intermediate Heat Exchanger in ADS显示文摘The intermediate heat exchanger for enhancement heat transfer is the important equipment in the usage of nuclear energy. In the present work, heat transfer and entropy generation of an intermediate heat exchanger(IHX) in the accelerator driven subcritical system(ADS) are investigated experimentally. The variation of entropy generation number with performance parameters of the IHX is analyzed, and effects of inlet conditions of the IHX on entropy generation number and heat transfer are discussed. Compared with the results at two working conditions of the constant mass flow rates of liquid lead-bismuth eutectic(LBE) and helium gas, the total pumping power all tends to reduce with the decreasing entropy generation number, but the variations of the effectiveness, number of transfer units and thermal capacity rate ratio are inconsistent, and need to analyze respectively. With the increasing inlet mass flow rate or LBE inlet temperature, the entropy generation number increases and the heat transfer is enhanced, while the opposite trend occurs with the increasing helium gas inlet temperature. The further study is necessary for obtaining the optimized operation parameters of the IHX to minimize entropy generation and enhance heat transfer. | WANG Yongwei HUAI Xiulan | 2018 | Journal of Thermal Science2018，27，2： | 2 |
| 14 | Convective heat transfer characteristics of China RP-3 aviation kerosene at supercritical pressure显示文摘 | Xunfeng Li Xiulan Huai Jun Cai Fengquan Zhong Xuejun Fan Zhixiong Guo | 2011 | Applied Thermal Engineering2011，，14： | 2 |
| 15 | A structured packed-bed reactor designed for exothermic hydrogenation of acetone显示文摘Fixed-bed reactors randomly packed with catalysts have many disadvantages that may adversely affect the desired chemical reaction.The increasingly used monolithic reactor,in contrast,has many operational advantages;however,for a kinetically-controlled reaction,it does not contain sufficient catalyst to sustain the reaction.To address the problems associated with both randomly packed-bed reactor and the monolithic reactor,a structured packed-bed reactor was proposed and mathematical models were built for randomly packed-bed reactor and structured packed-bed reactor.Their respective performances were compared when applied to the exothermic reaction of the isopropanol-acetone-hydrogen chemical heat pump system.The results showed that the structured packed-bed reactor performed better in terms of pressure drop and heat transfer capacity,and had a lower radial temperature gradient,indicating that this reactor had a higher effective heat conductivity.Isopropanol on the catalyst particle surfaces was more concentrated near the tube wall because a wall effect existed in the boundary layer around the particle-wall contact points. | Yanjun Duan Min Xu Xiaoming Zhou Xiulan Huai | 2014 | Particuology2014，12，6： | 2 |
| 16 | Analysis of the ef- fective thermal conductivity of fractal porous media显示文摘 | Huai Xiulan Wang Weiwei Li Zhigang | 2007 | Ap- pl Thermal Eng2007，27，17： | 1 |
| 17 | Thermodynamic analysis of lead-bismuth eutectic turbulent flow in a straight tube显示文摘 | GUO Jiangfeng HUAI Xiulan | 2013 | Energy2013，57，： | 1 |
| 18 | Simulation of Heat Transfer with the Growth and Collapse of a Cavitation Bubble Near the Heated Wall显示文摘The growth and collapse behaviors of a single cavitation bubble near a heated wall and its effect on the heat transfer are numerically investigated. The present study is designed to reveal the mechanism of cavitation enhanced heat transfer from a microscopic perspective. In the simulation, the time-dependent Navier-Stokes equations are solved in an axisymmetric two-dimensional domain. The volume of fluid (VOF) method is employed to track the liquid-gas interface. It is assumed that the gas inside the bubble is compressible vapor, and the surrounding liquid is incompressible water. Mass transfer between two phases is ignored. The calculated bubble profiles were compared to the available experimental data, and a good agreement was obtained. Then, the relationship among bubble motion, flow field and surface heat transfer coefficient was analyzed. On this basis, the effects of such factors as the initial distance between the bubble and the wall, the initial vapor pressure and the initial bubble nucleus size on the heat transfer enhancement are discussed. The present study is helpful to understand the heat transfer phenomenon in presence of cavitation bubble in liquid. | Bin Liu Jun Cai Fengchao Li Xiulan Huai | 2013 | Journal of Thermal Science2013，22，4： | 1 |
| 19 | Investigation on the applicability of turbulent- Prandtl-number models for liquid lead-bismuth euteetie 显示文摘 | CHEN Fei HUAI Xiulan CAI Juan | 2013 | Nuclear Engineering and Design2013，257，： | 1 |
| 20 | Effects of Chemical Reaction Caused by Cooling Stream on Film Cooling Effectiveness显示文摘With the increase of inlet temperature of gas turbines, the benefits by using the conventional methods are likely to approach their limits. Therefore, it is essential to study novel film cooling methods for surpassing these current limits. Based on the theory of heat transfer enhancement, a film cooling method with chemical reaction by cool- ing stream is proposed. In order to test the feasibility of the proposed method, numerical simulations have been conducted. The classic flat plate structure with a 30 degree hole is used for the simulation. In the present study, the effects of the parameters in relation to the chemical reaction on film cooling effectiveness, such as chemical heat sink, volume changes, and reaction rate, are investigated numerically. The conventional film cooling is also calculated for the comparison. The results show that film cooling effectiveness is improved obviously due to the chemical reaction, and the reaction heat and reaction rate of cooling stream have an important effect on film ef- fectiveness. However, the effect of volume changes can be ignored. | Keyong Cheng Shiqiang Liang Xiulan Huai Wei Chen Yongxian Guo | 2012 | Journal of Thermal Science2012，21，1： | 1 |
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