A Calculation Method of Equivalent Thermal Conductivity of Particle Dirt

Abstract

The invention relates to the field of a heat exchange equipment surface granular dirt heat conduction coefficient, in particular to a calculation method of a granular dirt equivalent heat conduction coefficient. The method is characterized by using the technical scheme that the granular dirt surface porosity is calculated; the granular dirt profile curve fractal dimension is determined; the calculated granular dirt surface porosity and the granular dirt profile curve fractal dimension are substituted into a granular dirt equivalent heat conduction coefficient expression; the equivalent heat conduction coefficient of the granular dirt is calculated. The method has the advantages that the method is scientific and reasonable; the applicability is high; the reliability is high; the cost is low; the effect is good, and the like. The surface study of the granular dirt is more precise and standardized, so that the heat transmission mechanism in the granular dirt can be more deeply disclosed; the foundation is laid for dirt damage reduction.

Description

technical field [0001] The invention relates to the field of thermal conductivity of particles and dirt on the surface of heat exchange equipment, and relates to a method for calculating the equivalent thermal conductivity of particles and dirt. Background technique [0002] Heat exchange equipment is one of the equipment frequently used in industrial production and daily life. At present, there are different degrees of fouling problems in the industrial operation of various countries in the world. The operation of heat exchange equipment is due to the deposition of dirt on the surface, which makes the heat exchange capacity of the equipment deteriorate. , In severe cases, it will accelerate the aging of heat exchange equipment, shorten the service life of heat exchange equipment, and even affect the safe operation of heat exchange equipment. The economy of the heat exchange equipment is greatly reduced, the operating cost is increased, and a lot of energy is wasted. Theref...

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Problems solved by technology

[0004] Aiming at the problems of high cost and unreliable data in the existing measurement of thermal resistance of dirt, the present invention is based on fractal theory and considers the porous structure of granular dirt and the fractal dimension of pore contours, and proposes a scientific and reasonable, strong applicability, The calculation method of the equivalent thermal conductivity of granular dirt with high reliability and good effect makes the surface research of granular dirt more accurate and standardized, thereby revealing the heat transfer mechanism in granular dirt more profoundly, and laying the foundation for reducing fouling damage

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