用概率统计法计算乱堆填料量

本文用概率统计的方法,推导出了一个能够计算单位体积中圆柱形填料量n的公式。按该式计算出的n与实际测得值吻合,能满足工业生产和设计要求。     

表面性质对板式塔性能的影响

表面性质对板式塔性能的影响范文元，查富芳，黄伯芬（合肥工业大学化工系）１实验装置与方法为研究表面张力梯度对不同类型塔板传质性能的影响及塔板材质的影响，本实验选择了以下四种塔板：（１）不锈钢筛孔板筛孔板按文献［１］设计，其结构参数为筛板直径４９ｍｍ；筛...     

离子交换法提取铼的研究

铼是一种很分散的金属元素,它主要用于石油工业和合成纤维工业作催化剂,在国防工业和电子工业中用途也很广。铼与钼二元素常共生在辉钼矿、斑铜矿之中,分别以MoS_2、ReS_2形式存在。钼矿含Re在0.0015～0.0030%范围内。由于含量低,     

金属环形填料受表面张力梯度影响的研究

本文对三种金属环形填料(6毫米压延微孔θ环、鲍尔环和拉西环)和两种物系(正庚烷/甲苯,σ~+系统;苯/正庚烷,σ~-系统)进行实验研究。考察三种填料在精馏σ~+系统和σ~-系统时的传质单元高度Hog,结果表明,表面张力梯度对不同填料的Hog都有明显的影响,对拉西环的影响最大,对压延微孔θ环的影响最小。在分离σ~+系统时表面张力梯度对传质过程起促进作用,而分离σ~-系统时,表面张力梯度将降低传质效率。这些富有实际意义的结论在分离过程的设计中具有一定参考价值。     

表面性质对板式塔性能的影响

<正> 1 实验装置与方法 为研究表面张力梯度对不同类型塔板传质性能的影响及塔板材质的影响,本实验选择了以下四种塔板: (1)不锈钢筛孔板     

应用激光成像系统研究非牛顿流体中的气泡生成

A self-developed laser image measurement system was established to study the behavior of bubble formation at a single orifice in non-Newtonian polyacrylamide （PAAm） solutions. Images of bubbles were captured by a CCD camera and volumes of bubbles were digitally analyzed online. The effects of rheological property of PAAm solution, orifice, reservoir, and gas flowrate on bubble formation were studied experimentally. It is found that the volume of bubble increases with the concentration of PAAm solution, the diameter of the orifice, and the gas flowrate, respectively, whereas little effect of reservoir is observed in experiments.     

复杂塔最小回流比的确定

用Underwood法确定复杂精馏塔最小回流比。对于一股进料,开设侧线产品的塔,证明了当各侧线中轻关键组份的浓度由下而上递增,重关键组份的浓度递减,且q_(p′)≤q_F≤q_P时,只要将underwood方程应用于进料级的上、下二段,即可求出控制最小回流比.     

水热条件对金红石型纳米二氧化钛微结构的影响

对金红石型纳米二氧化钛进行水热处理,利用X射线衍射和透射电镜对水热处理前后的纳米二氧化钛进行了表征。研究了pH值、水热反应温度和水热反应时间对金红石型纳米二氧化钛形貌和晶粒尺寸的影响。结果表明:随着pH值的增加,纳米二氧化钛粒子的生长速度减慢。随着水热反应温度的升高和水热反应时间的延长,纳米的晶粒尺寸和原始粒径逐渐变大。水热条件对纳米二氧化钛形貌的影响不大。     

拟塑性流体中伴有聚并的气泡上升混沌特征(英文)

The chaotic characteristics of bubbles rising with accompanying coalescences in pseudoplastic aqueous carboxymethylcellulose sodium (CMC) solution were studied by means of smoothed pseudo Wigner-Ville distribution and Wigner-Hough distribution. The temporal signal of bubble passage was measured utilizing a photoconductive data acquisition system. As bubble coalescence occurred, the smoothed pseudo Wigner-Ville distribution of the signal revealed that the signal could be divided into low-frequency and high-frequency ranges and the transition range according to the distribution feature of frequency domain, which reflected eddy motion of fluid, high frequency fluctuations of fluid velocity and other random components measured in the signal, and bubbles rising accompanied with coalescences, respectively. However, bubble coalescence occurred in the lower position and the frequency range of bubbles motion became wide under higher gas flowrate, while the frequency range of bubbles motion became narrow when the CMC concentration increased. The typical dynamics of bubbles motion, such as periodicity, bifurcation and chaos, could be easily found in terms of the Wigner-Hough distribution.     

幂律流体中平行上升双气泡间相互作用研究

采用流体体积(VOF)法对非牛顿幂律流体中平行上升双气泡间相互作用进行了模拟研究.结果表明:剪切变稀效应及气泡周围流场结构对气泡间相互作用的贡献分别随着气泡间距增大而减小,气泡间相互作用主要受气泡间流体涡旋结构控制.当初始间距很小时,气泡平行聚并发生;随着初始间距增大,双气泡行为转变为相互影响的平行上升;当初始间距增大...