Studying the effective longitudinal turbulent transfer at transverse streamlining of in-line tube bundles
V.I. Rachkov, V.N. Fedoseev, M.I. Pisarevskiy, A.S. Korsun, I.G. Merinov, Yu.N. Balberkina
National Research Nuclear University, Moscow, Russia
Keywords: коридорная упаковка стержней, турбулентное течение, эффективная теплопроводность, интегральная модель турбулентности, модель анизотропного пористого тела, пучки труб, пучки стержней, in-line rod packing, turbulent flow, effective thermal conductivity, integral model of turbulence, model of an anisotropic porous solid, tube bundles, rod bundles
Abstract
The experimental values of the effective thermal conductivity of water at transverse streamlining of the in-line rod bundles with square packing have been obtained. The effective thermal conductivity of water was measured in the direction parallel to the axes of the rods. The measurement method implied mixing of two flat parallel water flows in the working area; the latter moved at the same velocities, but had different temperatures. By measuring the flow temperatures before and after the mixing area, the amount of heat transferred from the hot to the cold flow was determined and the effective thermal conductivity of the liquid was calculated. In the investigated range of Reynolds numbers (from 7× QUOTE 103 to 8× QUOTE 104), calculated by the velocity in a narrow section, the experimental effective thermal conductivity of water showed a linear increase with increasing velocity and good agreement with the results of calculations by the integral turbulence model. The obtained experimental data have confirmed the possibility of using an integral turbulence model to calculate the parameters of the anisotropic porous solid model, used in CFD codes simulating thermal-hydraulic processes in the active zones of nuclear reactors and heat exchangers.
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