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A method of using laser induced fluorescence(LIF)technique was applied to two-dimensional measurement of the liquid concentration distribution in the 250Y structured packing sheet. The experimental structured packing sheet was made of perspex so that the laser could pass through it. The visualization of the distribution of the liquid concentration in the structured packing sheet was realized. The calibration of the thickness and liquid concentration was carried out firstly and the regression formula I=kcd was acquired, in which concentration c and the liquid film thickness d were both considered. Then the liquid feed of uniform tracer(rhodamine)concentration entered the perspex structured packing from the top under different spraying densities. The corresponding thickness of liquid film on the packing was calculated. Finally, tracer(rhodamine)with a high concentration was injected only at one fixed point of the structured packing under different spraying densities of the liquid. With the known liquid film thickness, the concentration distribution of the tracer can be calculated inside the structured packing sheet. 相似文献
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It is propsed that double level programming technique may be adopted in synthesis strategy ,Optimi-zation of heat exchanger network sturctural configuration (the master problem )may be solved at the upper level ,leaving the rest operaing conditions (the slave problem)being optimized at the lower level ,With the uniqueness in mind,an HEN synthesis expert system may be employed to address both the logical constraints and the global operation parameters‘ optimization using enhanced sequential number optimization theory,Case studies demonstrate that the synthesis strategy proposed can effectively simplify both the problem-solving and the synthesis process,The validity of the strategy recommended is evidenced by case studies‘ results compared. 相似文献
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过程系统综合问题通常是非线性和多峰的 ,求解该类问题的确定性方法通常会陷入局部极值陷井 ,随机方法则只能以一定概率得到全局最优解 .基于此 ,提出一种并行序贯寻优 (SNTO)方法 .该方法中 ,可行点均匀散布在可行域内 ,并行搜索模式为小样本条件下获得全局近最优解提供了可能 .对测试函数的有效求解验证了该方法的有效性 . 相似文献
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沙勇 成弘 袁希钢 刘春江 孙志发 余国琮 SHA Yong CHENG Hong YUAN Xi-gang LIU Chun-jiang SUN Zhi-fa YU Guo-cong 《天津大学学报(英文版)》2002,8(1)
利用激光作光源 ,通过光学纹影仪系统 ,系统观测了不同质量传递过程中浓度驱动的Rayleigh B啨ｎａｒｄ Marangoni对流结构 .在应用不同吸收剂的基础上 ,考查了密度梯度和表面张力梯度在RBM对流中的作用 .结果表明 ,实验过程中溶剂蒸发所导致的表面冷却和溶质吸收、解吸的热效应是影响RBM对流产生的重要因素 .在实验结果的基础上 ,定性地分析了RBM效应的观测结果 ,为进一步的理论分析提供了依据 相似文献
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Axialmixing ,or“longitudinaldispersion”and“backmixing”interminology,isanimportantnon idealflowphenomenoncommonlyoccurringinchemicalengi neeringprocess,suchasdistillation ,absorption,extrac tion,etc.Thisphenomenonrepresentsadeviationfrompistonflowandusuallyformsaparabolicaxialconcentra tionprofilealongtheflowdirection.Theunfavorableef fectofaxialmixingisthatitdecreasesthemasstransferdrivingforcesandfinallyleadstopoorerseparationeffi ciency.Instructuredpackedtower,althoughtheaxialmixingcanbe… 相似文献
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改革开放以来,随着经济的发展和财力的增强,我国高校在人才引进和培养上取得了很大的成绩.然而,在市场经济条件下,高校人才培养方面也出现很多不尽如人意的问题.比如学术腐败、学术浮躁、急功近利等行为在高校屡见不鲜,科学研究成果以及人才水平远低于社会的期望值. 相似文献
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To evaluate the influence of gas and liquid axial mixings on the separation efficiency of packed column, an approximate mathematical solution of HETP (equivalent height to a theoretical plate) under continuous operation has been proposed based on the mixing pool model. The mass transfer and hydrodynamic data of structured packing, Mellapak 350Y, obtained in a high pressure tower have been used to test the validity of the proposed model. Compared with the SRP model and the Gualito model, it is found that for high pressure distillation process the present mathematical prediction shows a mean relative error of about 10% to the experimental data,the accuracy of which is the same as that by the Gualito model but better than that by the SRP model. 相似文献
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