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| 1 | Measurement and Correlation of Pressure Drop for Gas-Liquid Two-phase Flow in Rectangular Microchannels显示文摘The pressure drop of gas-liquid two-phase flow in microchannel is of fundamental importance in heat and mass transfer processes. In this work,the pressure drop of gas-liquid two-phase flow in horizontal rectangular cross-section microchannels was measured by a pressure differential transducer system. Water,ethanol and n-propanol were used as liquid phase to study the effects of capillary number on pressure drop;air was used as the gas phase. Four microchannels with various dimensions of 100 μm× 200 μm,100 μm× 400 μm,100 μm× 800 μm and 100 μm× 2000 μm(depth × width) were used for determining the influence of configuration on the pressure drop. Experimental results showed that in micro-scale,the capillary number also affected the pressure drop remarkably,and in spite of only one-fold difference in aspect ratio,the variation of pressure drop reached up to near three times under the same experimental conditions. Taking the effects of aspect ratio and surface tension into account,a modi-fied correlation for Chisholm parameter C in the Chisholm model was proposed for predicting the frictional multi-plier,and the predicted values by the proposed correlation showed a satisfactory agreement with experimental data. | MA Youguang JI Xiyan WANG Dongji FU Taotao ZHU Chunying | 2010 | Chinese Journal of Chemical Engineering2010，18，6： | 16 |
| 2 | Hyperhomocysteinemia stimulates hepatic glucose output and PEPCK expression显示文摘Homocysteine 是在硫氨基酸新陈代谢的中介。最近的研究建议可能在 hyperhomocysteinemia 和胰岛素抵抗之间有连接。在现在的学习,我们在葡萄糖新陈代谢上调查了 homocysteine 的效果。我们证明胰岛素的层次比在在葡萄糖的管理以后的正常老鼠的那些在有 hyperhomocysteinemia 的老鼠是显著地更高的。葡萄糖输出上的胰岛素的效果显著地在对待 homocysteine 的 hepatocytes 被堵住。另外, phosphoenolpyruvate carboxykinase (PEPCK ) 的表示基因与 hyperhomocysteinemia 和与 homocysteine 对待的主要老鼠 hepatocytes 在老鼠的肝被提高。homocysteine 的行动被 H89 压制,一个蛋白质 kinase A (PKA ) 禁止者。因此, hyperhomocysteinemia 可以被看作一个风险因素关于提高的葡萄糖输出和 PEPCK 的 upregulation 贡献胰岛素抵抗的开发,可能经由 PKA 小径。我们的学习在 hyperhomocysteinemia 为胰岛素抵抗的发展提供新奇机械学的解释。 | Xue Yu Youguang Huang Qiang Hu Lanqing Ma | 2009 | Acta Biochimica et Biophysica Sinica2009，41，12： | 14 |
| 3 | Removal of SO2 using ammonium bicarbonate aqueous solution as absorbent in a bubble column reactor显示文摘在这个工作,从有空气的煤气的混合的 SO2 和由铵酸式碳酸盐的 SO2 的移动吸收剂在一个水泡列反应堆试验性地被调查的水的答案。铵酸式碳酸盐,煤气的阶段的 SO2 入口集中和移动上的煤气的流动率的集中的效果 SO2 评价被学习。结果看了那 SO2 入口集中和煤气的流动评估越多高, SO2 的 the lasting time 完全在煤气的插头移开越多 shorter,然后越多更快处于 SO2 的移动率的减少。完全在煤气的插头移开的 SO2 的 The lasting time 与增加铵酸式碳酸盐集中增加了。在 SO2 吸收的过程期间,有答案的批评 pH。答案 pH 是什么时候不到批评 pH,它将严厉地掉落,导致 SO2 移动率的快速的减少。为预言 SO2 移动率的一个理论模型被同时在液体阶段考虑化学改进和亚硫酸盐集中开发了。 | Xiaolei LI Chunying ZHU Youguang MA | 2013 | Frontiers of Chemical Science and Engineering2013，7，2： | 1 |
| 4 | Slug bubble deformation and its influence on bubble breakup dynamics in microchannel显示文摘The deformation of moving slug bubbles and its influence on the bubble breakup dynamics in microchannel were studied.Three bubble morphologies were found in the experiment:slug,dumbbell and grenade shapes.The viscosity effect of continuous phase aggravates the velocity difference between the fluid near the wall and the bubble,resulting in that the continuous phase near the bubble head flows towards and squeezes the bubble tail,which causes the deformation of bubbles.Moreover,the experimental results show that the deformation of bubbles could significa ntly prolo ng the bubble breakup period at the downstream Y-junction.There exists the critical capillary number Ca_(Cr )for the asymmetric breakup of grenade bubbles,Ca_(Cr )increases with the rise of flow rate and viscosity of the continuous phase. | Yingjie Fei Chunying Zhu Taotao Fu Xiqun Gao Youguang Ma | 2022 | Chinese Journal of Chemical Engineering2022，，10： | 1 |
| 5 | Scaling the formation of slug bubbles in microfluidic flow-focusing devices显示文摘 | Taotao Fu Denis Funfschilling Youguang Ma Huai Z. Li | 2010 | Microfluidics and Nanofluidics2010，，4： | 1 |
| 6 | Bubble formation and breakup mechanism in a mierofluidic flow-focusing device 显示文摘 | FU Taotao MA Youguang FUNFSCHILLING D | 2009 | Chemical Engineering Science2009，64，10： | 1 |
| 7 | Scaling the formation of slug bubbles in microfluidic flowfocusing devices 显示文摘 | FU Taotao FUNFSCHILLING D MA Youguang | 2010 | Microfluidics and Nanofluidics2010，8，4： | 1 |
| 8 | The drag coefficient and the shape for a single bubble rising in non-Newtonian fluids显示文摘 | LI Shaobai MA Youguang JING Shaokun | 2012 | Journal of Fluids Engineering Transactions of the ASME2012，134，08： | 1 |
| 9 | Formation dynamics and size prediction of bubbles for slurry system in T-shape microchannel显示文摘The bubble formation dynamics and size manipulation in the slurry of polystyrene microspheres in the microfluidic T-junction were visually investigated by a high-speed camera.Based on the evolution of the bubble neck with time,the formation process of bubbles is divided into three stages:filling,squeezing and pinch-off.The particle concentration has an obvious effect on the squeezing stage,while less impact on the filling and pinch-off stages.In the squeezing stage,the evolution of the dimensionless minimum neck width of bubbles with time could be described by a power-law relationship.The increase of the particle concentration or continuous phase flow rate could lead to the increase of body flow of the continuous phase and the enhancement of the squeezing force acted on the bubble neck,correspondingly,the power-law index a in the squeezing stage enlarges.Moreover,the bubble size increases with the increase of the gas phase flow rate and the decrease of the particle concentration and continuous phase flow rate.However,the effect of the particle concentration on the bubble size weakens with the increase of the continuous phase flow rate.In addition,a new prediction correlation of the bubble size for the slurry system in a T-shape microchannel was proposed with good prediction accuracy. | Zhen Chen Chunying Zhu Taotao Fu Xiqun Gao Youguang Ma | 2022 | Chinese Journal of Chemical Engineering2022，35，5： | 1 |
| 10 | Formation characteristics of Taylor bubbles in a T-junction microchannel with chemical absorption显示文摘This study focuses on the effect of chemical absorption on the formation dynamic characteristics and initial length of Taylor bubbles.The temporal evolutions of neck width and length of gaseous thread and initial length with and without chemical absorption were investigated with the Capillary number and Hatta number between 0.0010–0.0073 and 1.8–5.8 respectively.The squeezing regime with typical three stages,expansion,squeezing and pinch off is observed for both two processes.Compared with the nonabsorption process,the increase of formation time in the chemical absorption process arises mainly from the expansion stage,and the decrease of initial length is from the necking stage.In addition,the temporal length evolution satisfies the power-law scale with the same exponent but a smaller pre-exponential factor.The correlations of neck width for stage transition and initial length with Hatta number demonstrate the enhancement effect of chemical absorption on bubble formation dynamics and initial length at relatively high chemical reaction rates and long formation time.This study provides insight into the bubble formation mechanism and helps to regulate the bubble initial size with chemical absorption. | Yaran Yin Xianming Zhang Chunying Zhu Taotao Fu Youguang Ma | 2022 | Chinese Journal of Chemical Engineering2022，35，6： | 0 |
| 11 | Studies on the liquid-liquid interfacial mass transfer process using holographic interferometry显示文摘This paper aims at the interfacial phenomena of liquid-liquid mass transfer and its characteristic.By using the real-time holographic technique,the concen-tration distributions on the aqueous side were obtained according to holographic diagrams of mass transfer of ethanol through the interface of oil and water at different initial concentrations.Furthermore,the concentrations near the interface and the mass transfer coefficients were attained.A correlation of concentration near the interface to the concentration of the solute in the oil side was proposed.An approach of interfacial energy with solute concentration was established,and the calculated results are at good agreement with the experimental data.It is indicated that the liquid-liquid mass transfer process is approximately in accordance with two-film theory,the interfacial performance may be changed by the addition of the solute,and the interface of liquid-liquid is non-equilibrium thermodynamically during the mass transfer process. | Chaofan ZHAO Youguang MA Chunying ZHU | 2008 | Frontiers of Chemical Science and Engineering2008，2，1： | 0 |
| 12 | Effect of fine solid particles on absorption rate of gaseous CO_(2)显示文摘The influence of the properties of solid particles in slurry on the absorption of CO_(2) in the slurry was inves-tigated in a stirred thermostatic reactor.The absorption experiments were carried out in three different slurries con-sisting of water,cyclohexane and soybean oil,respectively,and three kinds of solid particles(active carbon,active alu-mina and silica gel)were incorporated into each of the above mentioned slurries separately.The experimental results show that the active carbon particles could enhance the absorption rate of gaseous CO_(2) in the aqueous slurry,while in the cyclohexane slurry,active carbon particles indi-cated no the absorption enhancement effect.However,it was observed that the active alumina and silica gel particles could enhance the absorption rate of CO_(2) in the cyclohex-ane slurry.These phenomena indicate that the solid part-icles,which could enhance the gaseous CO_(2) absorption rate,should possess two properties simultaneously,i.e.they rejected the solvent and had higher adsorption capacity for the solute.The experimental results also show that,as for those solid particles which could enhance the gas absorption rate,the enhancement increased quickly with the increase of solid concentration in slurry at first,and then reached a constant value gradually.It was also found that the enhancement factor was related to the coverage fraction of solid particles on the gas-liquid interface,and due to the reduction of surface fraction with increasing stirred speed,the enhancement factor decreased. | Sumin LU Youguang MA Shuhua SHEN Chunying ZHU | 2008 | Frontiers of Chemical Science and Engineering2008，2，4： | 0 |
| 13 | Mass transfer intensification and mechanism analysis of gas–liquid two-phase flow in the microchannel embedding triangular obstacles显示文摘An effective mass transfer intensification method was proposed by embedding different triangular obstacles to improve the gas-liquid mass transfer efficiency in microchannel.The influences of triangle obstacles configuration,obstacle interval and flow rate on the volumetric mass transfer coefficient,pressure drop and energy consumption were investigated experimentally.The enhancement factor was used to quantify the mass transfer enhancement effect of triangle obstacles.It was found that the isosceles or equilateral triangle obstacles are superior to the rectangular obstacles.The maximum enhancement factor of equilateral triangle obstacles was 2.35.Considering comprehensively mass transfer enhancement and energy consumption,the isosceles triangle obstacle showed the best performance,its maximum enhancement factor was 2.1,while the maximum pressure drop increased only 0.41 kPa(22%)compared to the microchannel without obstacles.Furthermore,a micro-particle image velocimetry(micro-PIV)was utilized to observe the flow field distribution and evolution,in order to understand and analyze the enhancement mechanism.The micro-PIV measurement indicated that the obstacle structure could induce the formation of vortex,which promotes convective mass transfer and thins the flow boundary layer,accordingly,the gas-liquid mass transfer efficiency is remarkably improved.This study can provide theoretical guidance and support for the design and optimization of microchannel with triangular obstacles. | Xuanyu Nie Chunying Zhu Taotao Fu Youguang Ma | 2022 | Chinese Journal of Chemical Engineering2022，，11： | 0 |
| 14 | Box-Behnken experimental design for optimizing process parameters in carbonate-promoted direct thiophene carboxylation reaction with carbon dioxide显示文摘A feasible synthesis route is developed for achieving the direct carboxylation of thiophene and CO_(2) in a relatively mild solvent-free carboxylate-assisted carbonate(semi)molten state.The effects of reaction factors on the carboxylate yield are investigated in the preliminary screening experiments,and the phase behavior analysis of the reaction medium is detected through the thermal characterization analysis of insitu high temperature X-ray diffraction measurement(in-situ XRD).The application of response surface methodology(RSM)based on the Box-Behnken design(BBD)is conducted to investigate the effect of the reaction parameters,such as reaction temperatu re,carbonate proportion,CO_(2) pressure and thiophene amount,on the product yield.The regressed second-order polynomial model equation well correlates all the independent variables.The analysis of variance(ANOVA)results reveal that the quadratic effect of reaction temperature is the most effective parameter in this carboxylation reaction owing to it’s the highest contribution to the sum of square(30.18%).The optimum reaction conditions for maximum product yield are the reaction temperature of 287℃,carbonate proportion of 32.20%,CO_(2) pressure of 1.0MPa and thiophene amount of 9.35 mmol.Operating under these selected experimental conditions,a high product yield(50.98%)can be achieved. | Qingjun Zhang Youguang Ma Xigang Yuan Aiwu Zeng | 2022 | Chinese Journal of Chemical Engineering2022，，10： | 0 |
| 15 | Direct carboxylation of thiophene with CO_(2) in the solvent-free carboxylate-carbonate molten medium:Experimental and mechanistic insights显示文摘A feasible synthesis route is devised for realizing direct carboxylation of thiophene and CO_(2) in a relatively mild solvent-free carboxylate-assisted carbonate(semi)molten medium.The effects of reaction factors on product yield are investigated,and the phase behavior analysis of the reaction medium is detected through the thermal characterization techniques.Product yield varies with the alternative carboxylate co-salts,which is attributed to the difference in deprotonation capacity caused by the base effect within the system.Besides,the detailed mechanism of this carbonate-promoted carboxylation reaction is studied,including two consecutive steps of the formation of carbanion through breaking the C-H bond(s)via the carbonate and the nucleophile attacking the weak electrophile CO_(2) to form C-C bond(s).The activation energy barrier in C-H activation step is higher than the following CO_(2) insertion step whether for the formation of the mono-and/or di-carboxylate,which is in good agreement with that of kinetic isotope effect(KIE)experiments,indicating that the C-H deprotonation is slow and the forming presumed carbanion reacts rapidly with CO_(2).Both the activation energy barriers in deprotonation steps are the minimal for the cesium cluster system since there have the weak the cesium Cs-heteroatom S(thiophene)and Cs-the broken proton interactions compared to the K2CO3 system,which is likely to enhance the acidity of C-H bond,lowering the C-H activation barrier.Besides,these mechanistic insights are further assessed by investigating base and C-H substrate effects via replacing Cs2CO3 with K2CO3 and furoate(la)with thiophene monocarboxylate(1b)or benzoate(1c). | Qingjun Zhang Pengyuan Shi Xigang Yuan Youguang Ma Aiwu Zeng | 2022 | Chinese Journal of Chemical Engineering2022，，10： | 0 |
| 16 | Coalescence dynamics of two droplets of different viscosities in T-junction microchannel with a funnel-typed expansion chamber显示文摘The coalescence behavior of two droplets with different viscosities in the funnel-typed expansion chamber in T-junction microchannel was investigated experimentally and compared with droplet coalescence of the same viscosity.Four types of coalescence regimes were observed:contact non-coalescence,squeeze non-coalescence,two-droplet coalescence and pinch-off coalescence.For droplet coalescence of different viscosities,the operating range of non-coalescence becomes narrowed compared to the droplet coalescence of same viscosity,and it shrinks with increasing viscosity ratioηof two droplets,indicating that the difference in the viscosity of two droplets is conducive to coalescence,especially when1<η<6.Furthermore,the influences of viscosity ratio and droplet size on the film drainage time(Tdr)and critical capillary number(Ca)c)were studied systematically.It was found that the film drainage time declined with the increase of average droplet size,which abided by power-law relation with the size difference and viscosity ratio of the two droplets:Tdr~(ld)^(0.25±0.04)and Tdr~(η)^(﹣0.1±0.02).For droplet coalescence of same viscosity,the relation of critical capillary number with two-phase viscosity ratio and dimensionless droplet size is Cac=0.48λ^(0.26)l^(﹣2.64),while for droplet coalescence of different viscosities,the scaling of critical capillary number with dimensionless average droplet size,dimensionless droplet size difference and viscosity ratio of two droplets is Cac=0.11η^(﹣0.07)ls^(﹣2.23)l^(0.16)_(d). | Weixi Guo Chunying Zhu Taotao Fu Youguang Ma | 2021 | Chinese Journal of Chemical Engineering2021，34，10： | 0 |
| 17 | The flow behavior of droplet adsorption on a liquid-liquid interface accompanied by cross-linking reaction and phase separation in a microchannel显示文摘The adsorption process of droplets on the liquid-liquid interface and phase separation process can regulate the spatial distribution of the fluid system,which are crucial for chemical engineering.However,the cross-linking reaction,which is widely used in the field of polymers,can change the physical properties of the fluids and affect the flow behavior accordingly.A configuration of microchannels is designed to conveniently generate uniform droplets in one phase of the parallel flow.The flow behavior of the adsorption process of sodium alginate droplets on the liquid-liquid interface is investigated,and the subsequent process of phase separation is studied.In the process of droplet adsorption,the crosslinking reaction occurs synchronously,which makes the droplet viscosity and the elasticity modules of the droplet surface increase,thus affecting the dynamics of the adsorption process and the equilibrium shape of the droplet.The variation of the adsorption length with time is divided into three stages,which all conform to power law relationship.The exponents of the second and third stages deviate from the results of the Tanner's law.The flow pattern maps of droplet adsorption and phase separation are drawn,and the operating ranges of complete adsorption and complete separation are provided.This study provides a theoretical basis for further studying the flow behavior of droplets with cross-linking reaction in a microchannel. | Haozhe Yi Taotao Fu Chunying Zhu Youguang Ma | 2024 | Chinese Journal of Chemical Engineering2024，66，2： | 0 |
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