Authors A. V. Paliy, N. N. Chernov
Month, Year 02, 2018 @en
Index UDC 658.51.011
DOI 10.23683/2311-3103-2018-2-184-193
Abstract Given is the numerical study of the efficiency of heating element surface which is based on the Navier-Stokes and energy transfer equations included in the mathematical part of the automated design system Ansys Fluent solver. The inefficiency of the irregular heating of the pin heating element surface area is investigated. This pin heating element is taken as an example of a typical classical radiator design. The requirement to optimize the radiator heat sink surface is explained. First of all it can be justified by absence of common approach to the problem of materials use inefficiency. Secondly, the increased temperature of electronic products operation is not only the cause of failures, but also significantly worsens their basic parameters. So it is necessary to search and apply various cooling methods and methods that ensure the preservation of parameters in specified norms. As the equipment becomes more complicated, the quantity of used elements and the degree of their integration increase, the heat removal, as well as methods for calculating thermal regimes acquire special significance. The initial data of the computational experiment is presented. At the channel input with a given speed and temperature, an air flow is flowing around the whip heat sink with an internal point source of heat. The velocity of the stream corresponds to the Mach number M << 1. External temperature (including the initial temperature of the radiator) is 22 ° C. The heat transfer coefficient is copper / air 11.3 W / m ^ 2 * C. The power of the source is 5 W. It is required to determine the distribution of the temperature field on the radiator surface in order to identify inefficient areas of the heat sink area. The external environment in the working space is air, considered to be an incompressible weightless viscous heat-conducting fluid. The flow around is symmetric (Ox is the axis of symmetry), the flow regime is laminar. The article contains an introduction to the problem of the equipment thermal regime normalizing, the relevance of the use of modern methods of heat sink and existing radiator designs optimization. The numerical experiment of the pin heating element efficiency is conducted for its further optimization. We can conclude that it is not advisable to use pins on the radiator surface. In this case, most of the heat is taken away by a small part of the radiator surface. An additional negative effect of the pins presence is the occurrence of local dipole and quadrupole components of the field, which cause only the plasma circulation.

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Keywords Thermal mode of equipment; numerical solution of differential equations; heat sink; effective surface area of the radiator; heat-loaded source; heat and mass transfer.
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