差速双螺杆捏合块液滴分散行为的可视化实验研究OA

The droplet dispersion behavior in differential twin screw kneading blocks is investigated through visualized experimental methods.A self-designed visualized extrusion platform and high-depth microscopy imaging technology are employed to analyze the effects of different rotational speeds on droplet dispersion.Using a sodium carboxymethyl cellulose(CMC-Na)base fluid system under a differential speed ratio of 2∶1(high-speed group:120-60 r/min,low-speed group:90-45 r/min),image processing algorithms are applied to quantitatively characterize macroscopic parameters including droplet area and major/minor axis lengths.Microscopic fragmentation morphology is observed via the RH-2000 high-depth microscope.Experimental results demonstrate that under high-speed conditions,the average droplet area decreased by 16.3%,area variance reduced by 29.2%,average major axis length shortened by 10.7%,and major axis variance declined by 23.1%.Microscopic observations revealed asymmetric stretching,secondary folding,and chain-like fragmentation patterns in high-speed conditions,with rough fracture interfaces and significantly smaller fragments.In contrast,low-speed conditions preserved quasi-circular droplet structures exhibiting regular fragmentation.The study confirms that increased rotational speed effectively enhances both dispersion capability and uniformity,providing experimental evidence for optimizing differential twin screw kneading block processes.