环保型人体管道铸型填充剂的实验研究

目的:探讨环保型人体管道铸型填充剂的应用效果。方法:通过对CYD-128型环氧树脂进行增韧改性制备的填充剂,在灌注时根据管道粗细不同,只需调整填充剂中LNBR-26的用量(比例)即可。灌注成人管道时,采取[CYD-128:LNBR-26=100:(20～24)]比例填充剂和不同配制比例交替灌注方法;灌注小儿管道时,采取(CYD-128:LNBR-26=100:22)比例填充剂灌注。并观察它们的铸型效果。结果:制作出的成人上、下肢动脉铸型标本细疏有致,能够清楚地观察到上肢桡动脉、尺动脉及它们的掌浅弓和掌深弓,下肢胫前动脉及其足背动脉网和胫后动脉及其足底动脉网。制作出的胎儿全身动脉铸型标本疏密有度,精细美观,不仅充分地显示胎儿脉管系统的完整性和连续性,还直观地展示全身主要动脉和其骨骼的立体结构及毗邻关系。结论:应用本填充剂制作出的铸型标本,不但具有环保、主干刚性强及细小分支柔韧性好等特点,而且经济成本低。

Experimental Observation of Two Phase Flow of R123 Inside a Herringbone Microfin Tube

Vapor-liquid two phase flow behavior of R123 inside herringbone microfin tubes has been studied. Herringbone microfin tube is a kind of internally finned tube in which microfins are installed inside the tube where the microfins form multi-V-shape in flow direction. For the present experiment three different types of herringbone microfin tubes with helix angle B = 8, 14 and 28 are used. Experimental observations showed how flow diverges and converges inside herringbone microfin tube due to fin arrangement. The effect is more remarkable for larger helix angle. From the measurements of the cross-sectional liquid flow rate distribution, the liquid removal and collection and the entrained droplet are discussed. Quantity of liquid droplets is increased with increase of helix angle. The tube with helix angle B = 28 shows higher quantity of liquid droplets than others.