2 edition of Verification of model of molten glass flow in a forehearth found in the catalog.
glass as it flows through the forehearth. Figure 1 shows the forehearth geometric and thermal con-figurations which were selected for evaluation. The inlet temperature was K and the mass aver-aged outlet temperature was K. The pull rate per forehearth was about 80 mTPD. The model included all radiation, convection and conduction effects. The heat fluxes at the surface of the glass. The final drawing temperature of the glass melt is controlled as carefully as possible by electrically heating the platinum–rhodium alloy plate, called a “bushing.” Molten glass flows normally by gravity through 1–2 mm diameter cylindrical “tips” as depicted in Figure 5. One bushing or “forming position” will have up to 10 tips.
Forehearth The Glass Conditioning process takes place in the Working End (t he Distributor) as well as in the Forehearth where the glass cooling is achieved by removing the heat from molten glass along the forehearth channel. A glass forehearth control system includes temperature sensing system and a . The temperature is limited by the quality of the furnace superstructure material and by the glass molten glass flows from a subducted channel known as the furnace throat into the refiner and forehearth channels. These channels transport the glass to the glass forming area.
In addition, the height of the glass surface was computed and integrated into the molten glass flow and heat transfer equations. Steady-state and transient forehearth simulations were conducted and the results were compared with previously published forehearth experimental operating data. Belz, Robert M. Integrated Modeling Analysis of Glass Furnace Forehearths as Applied to Production Planning Optimization. (Under the direction of Dr. John S. Strenkowski) A two-dimensional model was developed to investigate thermal variations within a glass furnace forehearth as used in the production of glass fibers. The goal of the simulations.
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Npsarchive pekcelen,s. verificationofmodelofmolten glassflowinaforehearth. Verification of model of molten glass flow in a forehearth.
Item Preview remove-circle Verification of model of molten glass flow in a forehearth. by Pekcelen, Sina. Publication date Topics Chemistry Publisher Monterey, California: U.S. Naval Postgraduate School CollectionPages: Verification of model of molten glass flow in a forehearth. A mathematical model for the computation of the steady state three-dimensional flow of molten glass in a forehearth is described.
This model rests upon a weak coupling approximation which reduces. Keywords: flow, fluid dynamics, glass, thin sheets, two phase flow. Introduction. Thin glass sheets play an important role in everyday life, for example television screens or mobile phones.
To gain further knowledge on the production process of thin glass sheets a numerical model to simulate the flow of molten glass is generated in this File Size: KB. It is believed that The molten glass is subsequently refined in an improved control strategy based upon a the working end of the furnace and finally mathematical model of the forehearth process conditioned in forehearths which deliver the is necessary to improve temperature control molten glass in the form of gobs to the glass under dynamic.
Simulation of the molten glass sheets flow 8. Fig. Fusion process developed by Cornig Inc. • The modeled part of the process simulates the end phase of the production, where the molten glass forms thin sheets (see Fig 1.). • The molten glass arrives in the trough with a predefined mass flow rate, fills the reservoir.
into the furnace that delivers molten glass at approximately °C into the refiner where the glass is refined. Then, the molten glass flows to the forehearths towards the forming machines.
At the outlet a plunger pushes portions of the glass through a ring and automated scissors cut the ‘drops’ of glass loose from the ring. As a consequence, in glass containers production plants, the working ends and forehearths’ main role is to reduce the temperature of the glass exiting the furnace and to reach the temperature which grants the right glass viscosity for the forming process.
The molten glass cannot be rapidly cooled. the model is able to simulate the overflow of molten glass flow. We were able to introduce a parameterized model in order to investigate different influences on the contour of the glass outflow. References: 1.
S.M. Dockerty. Sheet Forming Apparatus. Figure 2. Geometry of the Fluids and Boundaries U.S. Patent 3, () Figure 1. The. ow of a thin ribbon of molten glass on a bath of molten tin including temperature dependence of the viscosity of the molten glass.
It is not an objective to solve either numerically or analytically, the boundary value problem which is obtained. This dissertation is outlined as follows. In Chapter 2, the mathematical model is derived. The thin. A device for the on-line measurement of viscosity and/or level of molten glass, converting the values of these variables into proportional electrical signals.
The device comprises one sensor head connected to an electronic control unit and to a data processing unit. The sensor head comprises a fixed metallic core with external fins for air cooling, laid across by two vertical parallel shafts.
• The cooling air flow direction is against the glass flow direction • The bottom cooling channel is a standard installation in GCS Seriesand for the subsequent installation of a blower in case the product profile changes + Features • Precise conditioning of the glass.
In we combined features of the Emhart Glass and the SORG® STF forehearth designs, taking the best of both concepts to produce a hybrid design – the S. Two important features of the original Emhart Glass forehearth form the basis of the current S design: The shape of the superstructure, which features the refractory baffles.
Development of a Forehearth Control Using a Dynamic Zone Model Conference Paper (PDF Available) in Glass Science and Technology -Frankfurt am Main- 73(2) May with Reads. Pekcelen, S. ().Thesis: verification of model of molten glass flow in a forehearth.
United States Naval Postgraduate School. Pilon, L. Modelling radiation characteristics of semitransparent media containing bubbles or particles. These forehearths are located after the glass furnace and deliver molten glass to the forming equipment (see Figs. 1 and 2). The forehearth is a refractory channel through which a continuous stream of glass flows.
Previously, in Fig. 4, we had shown the schematic of a typical glass container forehearth. The key forehearth design criteria are to. A forehearth is a shallow channel connecting the glass melting furnace to the gob dispenser in the glass bottles production process.
Although the temperature of the molten glass has to decrease by several hundred degrees in the forehearth, the temperature distribution in the outlet section must be uniform. Three-Dimensional Flow and Thermal Structures in Glass Melting Furnaces. Part I.
Eﬁects of the Heat Flux Distribution. This paper presents a study of the °ow and thermal structures in the molten glass bath of a typical glass Figure 3 shows a schematic of a model glass melting tank and the system of coordinates used in this study.
The importance of design & specification for the forehearth & distributor David Parkinson Headloss is the loss of glass level along the forehearth from the entrance to the spout. It is a function of the following: the sides of the glass flow, and is exhausted through dedicated side.
Other factors such as glass flow, structural heat loss, asymmetric heat loss, influence from adjacent fore-hearths and furnace related fluctua-tions conspire against thermal con-ditioning in the forehearth and con-tribute to the creation of thermal gradients within the glass.
The key forehearth design requirement is to dissipate these gradients.Reference is given to previous work on heat flow by convection, radiation and conduction as applied to clay refractorise. Experimental data are given for conductivity of flux block, and for the effective conductivity of molten glass as a function of temperature.
Photographs are presented to show existence of convection currents in a glass tank.• Model data (i.e. properties, bc’s, etc) • Post-processing reports Searching – Common repository Recycling/Resurrecting Data – Model data – Quickly launch a comparative study to help decision-making Data Security 8/17/