Azimuthal non-uniformities of temperature of fuel elements arranged in regular lattices for turbulent liquid metal flow

Three methods for semiempirical solution of the problem on nonuniformity of the temperature of fuel elements in regular lattices are considered. An analytical solution based on the hypothesis of analogy of the local heat transfer coefficients with those in equivalent parallel-sided slits is obtained. Another solution is also obtained, with the use of the universal temperature profile in a round pipe. It is believed that the solution in which a temperature profile for a ''rod'' flow is used for estimating azimuthal, heat flux in the coolant is the principal one. On the basis of an analysis of calculated and experimental data, a simple approximation formula for calculating nonuniformities in fuel element temperature is recommended