Method for determining convective heat transfer coefficients of porous medium

Abstract

The invention provides a method for determining the convective heat transfer coefficients of a porous medium and relates to the technical field of porous media. The method comprises the steps that a random three-dimensional porous medium is generated on the basis of a process reconstruction technology and the equivalent diameters of support bodies forming a porous framework are obtained; a latticeBoltzmann distribution function of a temperature field and a velocity field is built on the basis of the migration and collision relation of fluid particles in a lattice Boltzmann model and the macrovariable of the fluid is computed; the Reynolds number of the fluid is computed according to the equivalent diameters of the support bodies and the macro variable of the fluid; the boundary distribution function is obtained on the basis of the boundary conditions of the lattice Boltzmann model and whether the condition of convergence is met is judged so as to end computing when the condition of convergence is met; the porposity, the Reynolds number and the Prandtl number of the random three-dimensional porous medium are fitted on the basis of the final temperature field distribution so as toobtain the empirical correlation of the convective heat transfer coefficients of the random three-dimensional porous medium. The method for computing the convective heat transfer coefficients is simple and has excellent universality.

Description

Technical field [0001] The present disclosure relates to the technical field of porous media, and in particular to a method for determining the convective heat transfer coefficient of porous media. Background technique [0002] Energy transfer in porous media is a common phenomenon in nature, which is widespread in various fields of industrial production, such as oil extraction, convective drying of food, medicinal materials and agricultural products, and evaporation of porous materials in various industrial heat exchange equipment. The development and utilization of geothermal resources, as well as the supply and demand of energy, water and nutrients by plants in the agricultural system. In view of the great significance of porous media in science, engineering, and application, under the premise of continuous improvement of computer conditions, related research on porous media has become a research hotspot in the scientific and engineering circles. [0003] The heat exchange proc...

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Problems solved by technology

In addition, the currently known convective heat transfer coefficient correlations of various porous media are mostly limited by materials, pore structures and other factors, so they lack universality.

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