GJ纤维直径成分含量测试仪对棉麻纤维直径测试修正方法研究

GJ纤维直径成分含量测试仪利用专利着色剂对纤维素纤维进行着色,由计算机自动识别纤维素纤维种类,从而完成对纺织品直径混纺含量全自动测量。由于在着色剂液体中,吸水性的纤维素纤维直径会膨胀。因此,所测出的纤维直径将变大。本文通过测试棉麻纤维在着色剂着色前后直径的变化,发现着色前和着色后的直径在统计上呈线性关系,据此,提出对着色后测得纤维直径进行修正的方法,实验验证结果表明这一方法是可行的。

论述离心泵叶轮切割方法

离心泵已广泛应用于国民经济的各行各业。在泵生产及应用过程中,人们经常遇到的问题是,泵的性能参数、设计要求及使用要求或多或少地存在偏差,这就要求通过最少的工作量或改变最少的零件,使泵的性能参数得到校正,以期满足人们对其性能的各种要求。本文讨论了离心泵叶轮切割公式及方法,并按照各种方法对现场离心泵叶轮进行切割试验,通过试验总结出一种快捷、可靠的离心泵叶轮切割方法。

离心泵叶轮切割

通过实践总结出一种快捷、可靠的离心泵叶轮切割方法。

Effect of nozzle geometry on pressure drop in submerged gas injection

Submerged gas injection into liquid leads to complex multiphase flow, in which nozzle geometries are crucial important for the operational expenditure in terms of pressure drop. The influence of the nozzle geometry on pressure drop between nozzle inlet and outlet has been experimentally studied for different gas flow rates and bath depths. Nozzles with circular, gear-like and four-leaf cross-sectional shape have been studied. The results indicate that, besides the hydraulic diameter of the outlet, the orifice area and the perimeter of the nozzle tip also play significant roles. For the same superficial gas velocity, the average pressure drop from the four-leaf-shaped geometry is the least. The influence of bath depth was found negligible. A correlation for the modified Euler number considering the pressure drop is proposed depending on nozzle geometric parameter and on the modified Froude number with the hydraulic diameter of the nozzle do as characteristic length.

麻、棉与再生纤维素类成分定量分析

在纺织产品检测中,苎麻与棉的含量一般用物理法检测。根据标准FZ/T 30003—2009,用每种纤维直径的平均值与所测计数根数进行计算,如果在纺织品中加入再生纤维素纤维(黏纤、竹纤、莫代尔、莱赛尔)等,则需要相应的直径平方数或平均直径之间的修正系数。