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Hanesenie periodic protrusions on the wall surfaces is washed well tested in practice, the heat transfer intensification method vortex.1,2 Intensification of heat transfer for flow conditions coolants in the tubes with turbulators held and carried mainly by experimental methods1,2 and theoretical studies rather scarce, many of them are based on integral approaches.3-7 At the present stage of research tasks aerodynamics and thermo vouchers and eddy currents are increasingly hesitant multiblock methods of computing technologies based on intersecting structured grids.8-12 The relevance of the problem caused by the use of heat transfer fluids in various fields of technology in the form of liquid metals. Their use is advantageous in those cases where the required intensive heat transfer from the heated surface, and also in cases provide a high coolant temperature at low pressures. Cooling liquid coolants in metal form combines advantages of gas and liquid cooling. The most suitable heat transfer fluids of this type are the alkali and heavy metals and their alloys. Physical properties of liquid metal are substantially different from those of conventional coolants gases, water, oil and other liquid metals have greater thermal conductivity coefficient. value lower than the heat capacity; particularly low value of the Prandtl number (Pr=0.005÷0.05). Low values of the Prandtl number Pr explained by a higher coefficient of thermal conductivity, for example, at temperatures (100÷700)°C thermal conductivity coefficient λ sodium Na coctavlyaet order (86÷59) watt/(m·K), and for potassium K-of the order of (46÷28) watt/(m·TO). This study is a logical extension of the above methods for computing13-25 for the analysis of turbulent flow and heat transfer tubes in the U-shaped flow turbulators (diaphragms) with different relative heights steps for different modes of coolant flow with for a more detailed analysis of the enhancement of heat transfer to heat transfer with small Prandtl numbers specific to liquid metals. Previously, this aspect is practically not been studied.

aeronautics and aerospace open access journal

Theoretical study of heat transfer in straight circular pipes with periodically arranged surface flow turbulence semicircular cross-section for the flow of liquid metal to various geometrical and operating parameters