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本文以真空喷射法制备聚合物薄膜为研究背景,对其重要的发生元件喷嘴进行了选型研究。现阶段应用最为广泛的直射式喷嘴有直线型、锥形、锥直型和抛物线型四种类型,通过Fluent软件对喷嘴喷射后的液体射流流速、压力分布和湍流强度三个方面进行了模拟分析。结果表明:在相同的初始条件下,锥形直射式喷嘴其射流速度分布均匀,压力分布也比较均匀,射流流场的扩散性优于其它类型的喷嘴;此外其射流雾化后的液滴尺寸分布均匀,射流的贯穿距离较长,液体出喷嘴后湍流强度较大,射流后液体的雾化破碎效果较好,更适于制备成膜致密,膜厚均匀可控的聚合物薄膜。
In this paper, the vacuum jet method for the preparation of polymer films for the research background, the nozzle of its important components have been selected type of study. At present, the most widely used direct-fired nozzles are four types of linear, conical, cone-shaped and parabolic. Fluent software is used to simulate the jet flow velocity, pressure distribution and turbulence intensity after the nozzle is jetted . The results show that under the same initial conditions, the conical direct-flow nozzles have uniform jet velocity distribution and uniform pressure distribution, and the jet flow field has better diffusivity than other types of nozzles. In addition, the droplet size The distribution of the jet is long and the turbulent flow intensity of the liquid out of the nozzle is larger. The atomization and breaking effect of the liquid after the jet is better, which is more suitable for preparing a polymer film with dense and uniform film thickness and controllability.