Research Of The Influences And Mechanisms Of Rotary Disc On The Ultrafineization Of Glass Wool

Glass wool made by rotational method has fluffy fibers overlap in it and is a typical inorganicporous material which has excellent performance of sound absorption and heat insulation. It can beused in various industrial fields of aeronautics, astronautics, architecture, home appliance,transportation. Researches show that the thinner the diameters of glass wool are, the better propertiesof sound absorption and thermal insulation the glass wool is. Thus, diameters need to be minished inorder to obtain high performance glass wool. Rotary disc is the key part which plays the mostimportant role in process of producing glass wool. Based on the above objectives, in this thesis, wesuccessfully prepared ultra-fine glass wool by rotational method and deeply investigated thetechnology as well as analyzing influences and mechanisms of rotary disc on the ultrafineization,different characterization methods are used in the thesis.Results show that influences of rotary disc on ultrafineization of glass wool include: diameter ofsmall holes on side wall of rotary disc, diameter of rotary disc and rotational speed of rotary disc.Results indicate that when diameter of small holes are bigger, single hole flow increases and averagediameter of glass wool increase; When diameter of rotary disc is bigger, much heat losses which resultin temperature of vitreous humour decrease and the viscosity increase, it is hard to draft vitreoushumour, so diameter of glass wool increase. But if the diameter of rotary disc is too small,temperature of vitreous humour become too high and viscosity is too low, draft force can not transitevenly, slag ball are produced, so diameters of glass wool are bigger. When rotating speed of rotarydisc increase, wiredrawing speed increase, diameters of glass wool increase, but when rotating speedis too high, vibrate leads to unbalance of rotary disc and it will influence the distribution of diameterof glass wool. By researching different process parameters, microelement strengthened Ni-Cr basedalloy, rotary disc diameter of250~300mm, holes amount of8000~10000, vitreous humourtemperature of950~1170℃, rotational speed of3300~3900rpm, single hole flow of0.0010~0.0015cm3/s was choosed, as a result, we obtained integrated form glass wool fibers close tonormal distribution, with average diameter range from2.5μm to4μm.In addition, in this thesis, numerical simulation research about centrifugal process by usingcomputational fluid dynamics software FLUENT was developed, thus, we hope to promote processoptimization of ultrafineization of glass wool fiber and improve its quality.2D transient flow model ofmelting glass jet from side holes of rotary disc was established, we systematically analysed characteristic regulation of vitreous humour jet from side holes, a fine convergent2D design sketchvisually reflected the rotational process. Combined with this software, optimized design project aboutultrafineization of glass wool was raised.