Browsing by Author "Zhiqiang, Yang"

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    Basic flow pattern and its Variation in different types of glass tank furnaces
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1997) Zhiqiang, Yang; Zhiao, Zhou
    The mohen glass current in tank furnaces was studied by physical modelling. The basic flow pattern was divided into batch, melting, stagnant buffer, refming and conditioning regions. Every region and its special function are discussed here. The forming me chanism of the stagnant buffer area and the nearer or farther return position of back current, in particular, are presented with a new approach. A pull current path within the glass melt in tank furnaces was assumed. Along this path the pull current has minimum residence time. This is a key parameter to analyze the process of efficient glass melting. Based on the model assumed, several operating stages with the changes in furnace structure are discussed. The factors affecting the pull current path must be those that mainly influence the whole melting process. The conclusion is supported by the Observation and measurement in the physical model . It also shows good agreement with operating experiences on actual furnaces. Through the research work in a series of furnaces, the authors have found that the flow pattern in tank furnaces wi th a throat greatly differs from that in open cross-fired furnaces without a throat. There is a strong back current from conditioning t ank to melting tank in the latter one. But for the furnace with a throat little back current could be found through the throat to the melting tank, i.e., the pull current in forward flow is not diverted and raised at the hot spot and therefore can flow directly along the bottom to the throat. No triangle stagnant area exists in this type of furnace. In order to overcome this shortcoming, measures are proposed and discussed in the paper.
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    Flow pattern of glass current in unit melters and its forming mechanism
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1997) Zhiqiang, Yang; Zhiao, Zhou
    The flow pattern of glass current in unit meUers greatly differs from that of other tank furnaces. When two rows of bubbling arearranged, the whole flow process is reorganized by the bubbling circulations. Hence, the flow pattern caused by bubbling wasinvestigated in this paper. This flow pattern was divided into inner bubbling region and outer induced flow ränge. The boundary between the two parts of the flow pattern looks like the cross-section of an onion. Its forming mechanism is discussed in detail.The pull current path goes up and down several times due to the bubbling and the geometric configuration of the melter. The glassmelting process in the tank is closely related tothe flow pattern. In order to depict the process conveniently, five regions oftheflow pattern in the melter were identified, each having a particular function. This procedure maybe useful for understanding the melting process.