共查询到20条相似文献,搜索用时 171 毫秒
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在多相流实验管路系统中,设计向上30°倾斜管道中气液两相流的实验方案和流程,进行气液两相流流型实验研究,并绘制气液两相流流型图。再利用COMSOL Multiphysics软件,对向上30°倾斜管中气液两相流中不同时刻的体积分数进行数值模拟研究,验证COMSOL Multiphysics应用于气液两相流的可行性。结果表明采用COMSOL Multiphysics软件数值模拟向上倾斜管道中气液两相流流型的分析结果与室内实验法结果基本一致,可信程度较高,可作为分析气液两相流流型的主要方法之一。 相似文献
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引 言在化工、石油及动力等工程中 ,气液两相流动现象极为普遍 ,其研究得到了人们的广泛重视 .气液两相流动中的管道平均压降与其他流动条件及参数之间的关系已有较多的研究 ,得到了大量数学模型和经验公式可资工程设计应用[1,2 ],但对管道压降动态特性的研究还不多见 .而对于两相流系统安全性能的设计和运行状态监控等方面 ,管道压降的动态特性无疑是极为重要的参数 .另一方面 ,气液两相流动体系中的空隙率是表示气相浓度 (含气率 )的常用指标之一 ,它对确定气液两相流系统的流型、气液分相流量以及管道中的摩擦压降、重力压降和惯性压降… 相似文献
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旋流型管道气液分离器能够实现高气速下的气液分离,而壁面小孔处的相分离特性是决定分离器性能的重要因素。为优化气液分离器的结构与操作参数,文中应用计算流体力学(CFD)模拟方法,基于冷模实验验证,研究了旋流型管道气液分离器内部流场及小孔处的相分离特性。结果表明:气液分离器内两相流流型沿轴向由雾状流向环状流转变,在L/D≤1.0区域内(L为小孔的轴向位置,D为管径),壁面无液膜覆盖,液相分流系数随轴向距离的增加而增加,在L/D1.0区域内,液膜在壁面处形成,液相分流系数较高且稳定在0.007左右;增大小孔直径或小孔两侧压差,小孔内的液相分流系数增加,但分流比降低。研究结果可为旋流型管道气液分离器的优化设计提供理论指导。 相似文献
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建立了板式塔和填料塔中伴有复杂反应气液吸收过程模拟计算的严格数学模型,并给出模拟计算的程序框图。探讨了模型的解法,并用二乙醇胺和甲醇溶液吸收H_2S和CO_2的工厂操作实测数据对模型进行了验证。 相似文献
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Rein Munter 《臭氧:科学与工程》2010,32(6):399-407
The aim of this study was to compare the pressure drop (Δp) generated by a static mixer with sieve plates in two-phase downflow (water as a continuous phase), and the mass transfer efficiency (kLa, a) with the performance of other static mixers (Sulzer, Kenics, Karman, etc.). The relationships for Δp, kLa and interfacial area (a) calculation depending on liquid and gas phase velocities and geometry of the plates (sieves) in this static mixer are presented. kLa was found to be strictly proportional to the power consumption (P/V) and its values were quite close to those obtained in Sulzer & Kenics mixers with an 8-element mesh. Enhancement factors for oxygen absorption in the sodium sulphite solution and for ozone absorption in Lake Ülemiste water were calculated and the plausible values of the interfacial area (a) were estimated. 相似文献
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为了解决水平液固循环流化床中颗粒分布不均匀问题,在内径29 mm、长4 m的水平有机玻璃管流化床内放入Kenics静态混合器,采用CCD图像测量与数据处理系统考察静态混合器的结构、个数、安装位置对液固二相流中颗粒分布的影响;同时,利用U型管压差计考察不同条件下静态混合器的压降。实验结果表明:Kenics静态混合器能明显地改善管内颗粒分布情况;单个扭率Y=3.5的Kenics静态混合器压降最小;2个扭率Y=3.5的Kenics静态混合器间距为40 mm时对颗粒分布影响长度是最长的。 相似文献
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Chandra Mouli R. Madhuranthakam 《Chemical engineering science》2009,64(14):3320-3328
A Kenics® KMX static mixer that has curved-open blade internal structure was investigated to study its hydrodynamic performance related to residence time distribution and liquid holdup in a gas/liquid system. The static mixer reactor had 24 mixing elements arranged in line along the length of the reactor such that the angle between two neighboring elements is 90°. The length of the reactor was 0.98 m with an internal diameter of 3.8 cm and was operated cocurrently with vertical upflow. The fluids used were hydrogen (gas phase), monochlorobenzene (liquid phase) and hydrogenated nitrile butadiene rubber solution (liquid phase). In all the experiments, the polymer solution was maintained as a continuous phase while hydrogen gas was in the dispersed phase. All experiments were conducted in the laminar flow regime with the liquid side hydraulic Reynolds number in the range of 0.04-0.36 and the gas side hydraulic Reynolds number in the range of 3-18. Different polymer concentrations and different operating conditions with respect to gas/liquid flow rates were used to study the corresponding effects on the hydrodynamic parameters such as Peclet number (Pe) and the liquid holdup (εL). Empirical correlations were obtained for the axial dispersion coefficient (Da) and liquid holdup in liquid system alone and for the gas/liquid system separately. It was observed that the Peclet number decreased with the introduction of gas in to the reactor while in the liquid system alone, an increase in viscosity decreased the Peclet number. The liquid holdup was empirically correlated as a function of the physical properties of the fluids used in addition to the operating flow rates. 相似文献
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Tirupati Reddy Keshav P. Somaraju K. Kalyan A.K. Saroha K.D.P. Nigam 《Chemical Engineering and Processing: Process Intensification》2008,47(12):2275-2280
The residence time distribution (RTD) of the liquid phase for co-current gas–liquid upflow in a Kenics static mixer (KSM) with air/water and air/non-Newtonian fluid systems was investigated. The effect of liquid and gas superficial velocities on liquid holdup and Peclet number was studied. Experiments were conducted in three KSMs of diameter 2.54 cm with 16 elements and 5.08 cm diameter with 8 and 16 elements, respectively, of constant Le/De = 1.5 for different liquid and gas velocities. A correlation was developed for Peclet number, in terms of generalized liquid Reynolds number, gas Froude number and liquid Galileo number, where as for liquid holdup, a correlation was developed as a function of gas Reynolds number. The axial dispersion model was found to be in good agreement with the experimental data. 相似文献
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气体搅拌的萃取塔气—液—液系统流体力学性能和传质特性 总被引:7,自引:0,他引:7
1引言采用机械搅拌的萃取塔已广泛地应用在石油和化学工业生产中。近年来,一些研究学者又开发了用气体进行搅拌的萃取过程[1~3],与机械搅拌相比,采用气体搅拌具有塔内无运动部件、操作稳定、结构简单、能耗低等特点,无疑给操作带来方便。如果在塔内装入静态混合... 相似文献
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Kenics静态混合器的流体力学性能 总被引:2,自引:1,他引:2
用激光测速仪(LDV)测定了φ50mm Kenics静态混合器的流场、压力降和液滴平均直径。着重讨论了流量和混合单元数对轴向速度、切向速度和湍流强度的影响,并对静态混合器内液滴粉碎的机理进行了探讨。研究结果对消化吸收引进技术和合理地设计大型静态混合器具有参考价值。 相似文献
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对管内插入Kenics静态混合器的水平液固循环流化床换热器进行实验研究,实验考察了静态混合器扭率、静态混合器安装方式、液体流速、颗粒体积分数对传热性能和流阻性能的影响,并运用综合强化传热性能评价指标(PEC)对其进行分析。实验发现,传热性能和阻力系数均随扭率增加而减小。当雷诺数在10000~45000之间时,扭率为1.5、2、2.5、3.5的Kenics静态混合器的PEC指标均大于1,说明了水平流化床换热器插入Kenics静态混合器能够改善传热。在雷诺数达到25000左右、Kenics静态混合器扭率为2.5、颗粒体积分数为4%时,水平流化床换热器的PEC指标最高达到1.18。当两个扭率均为2.5的Kenics静态混合器安装间距为200mm时,水平流化床换热器的PEC指标最高。 相似文献
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以饱和硫酸钙为介质,在安装Kenics静态混合器的水平液固两相流化床换热管上进行实验研究,考察介质流速、Kenics静态混合器扭率、颗粒体积分数及颗粒尺寸对压降的影响,并与冷态实验条件下的压降变化规律进行比较。结果表明:同等操作条件,安装Kenics静态混合器后压降比安装前提高20%~140%;压降随雷诺数的增大而增大,随Kenics静态混合器扭率的增大而减小;颗粒体积分数对压降也有影响。根据实验数据,得出了稳定操作条件下压降与上述影响因素之间的经验关联式,为带有Kenics静态混合器的水平液固两相流化床换热器的设计提供计算依据。 相似文献