When there is an increase in the individual capacity of electrolyzers and anincorporation of central systems of automated alumina feed, the problem of providing a stable side lining with sufficient thickness becomes very important. In order to resolve this problem experimental research was needed into heat and temperature fields of cathode junctions in order to determine those factors which affect lining thickness and the dynamics of its change. Today, a series of methods have been developed making it possible - by numerical simulation - to project a the lining thickness [1-3]. These methods, in the long run, are based on a balance for the heat flow to the lining from the electrolyte side, and the heat flow from the surface of the cathode jacket. The heat flow from the cathode jacket is calculated from temperature measurements and from criterial formula for free convection. The radiating component heat loss is either calculated separately or is introduced in the form of a corrective to the connective heat emission coefficient [4].
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