Liquid metal flow heat transfer calculation method

Abstract

The invention discloses a liquid metal flow heat transfer calculation method. The method comprises the following steps that 1, establishing physical fields needed for solving in OpenFOAM; 2, applying boundary conditions to each physical field, and marking wall surface grids; 3, solving a mass and momentum conservation equation through pressure-velocity coupling iteration, and solving a specific energy equation; 4, judging whether coupling iteration converges or not, and determining to return to the step 3 or carry out the next step; 5, updating effective viscosity and thermal diffusivity in momentum and specific energy equations based on a k-omega-k theta-omega theta turbulent flow heat exchange model; 6, updating physical properties and variable source items in each equation; 7, updating the pulsation temperature square mean value k theta and the unit dissipation rate omega theta on the marked wall surface grid, judging whether external iteration convergence exists or not, and determining to return to the step 3 to continue calculation or finish calculation. According to the method, the problem that an advanced turbulence heat exchange model, which is low in precision despite high theoretical property and complex in solution, is difficult to implement and apply in commercial CFD software when a traditional constant-value turbulence Prandtt number vortex diffusion model is used for calculating the liquid metal flow heat transfer phenomenon is solved.

Description

technical field [0001] The invention belongs to the technical field of thermal hydraulic calculation methods of nuclear reactors, and in particular relates to a liquid metal flow heat transfer calculation method. Background technique [0002] The liquid metal reactor is one of the priority reactor types recommended by the Generation IV International Forum (GIF) for the fourth-generation nuclear energy system. It has the advantages of strong heat-carrying capacity of the coolant and is not prone to boiling, and has received extensive attention and research. In traditional commercial CFD software, for the numerical simulation of liquid metal, the simple eddy current diffusion model based on the Reynolds analogy assumption, which is suitable for common working fluids such as water and air, is usually used. However, due to the low Prandtl number and high thermal conductivity of liquid metal and other special thermal properties, such as figure 1 As shown, its flow and heat trans...

AI Technical Summary

Problems solved by technology

This method overcomes the limitations of the Reynolds comparison assumption, avoids the use of a simple eddy current diffusion model with weak theory and large errors in commercial software, and solves the problem that commercial CFD software is difficult to accurately simulate the flow and heat transfer of liquid metal. It provides the possibility for the development and application of advanced thermal-hydraulic models in the open source CFD platform to realize the three-dimensional high-precision numerical simulation calculation of the whole core of liquid metal reactors

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