Heat transfer of a radiator with spatial ordered lattice structures under conditions of free convection
DOI: 10.17586/1606-4313-2023-22-4-33-43
UDC 536.24
Lopatin Alexey L., Gabdullina Rosalia A., Biktagirova Aigul R., Terentyev Alexander A.
Keywords: heat transfer intensification, spatial lattice structures, topological optimization, cooling systems, heat flow, additive technologies.
UDC 536.24
Heat transfer of a radiator with spatial ordered lattice structures under conditions of free convection
For citation: Lopatin A.A., Gabdullina R.A., Biktagirova A.R., Terentyev A.A. Heat transfer of a radiator with spatial ordered lattice structures under conditions of free convection. Journal of International Academy of Refrigeration. 2023. No 4. p. 33-43. DOI: 10.17586/1606-4313-2023-22-4-33-43
Abstract
The paper presents the results of physical and mathematical modeling of heat transfer for radiators made on the basis of spatial lattice structures using laser sintering under conditions of free convection. The obtained data indicate that in a wide range of Ra numbers the maximum values of heat transfer correspond to the working section No. 2. At the same time, it is noted that the dependence of heat transfer on the mode parameter is of a complex nonlinear character and is confirmed by the peculiarities of physical processes occurring in lattice structures. The influence of the constraining channel on the heat transfer is revealed. It is determined that increasing height of the casing elevation decreases its influence on heat transfer. The maximum value of Nu corresponds to the height h = 5 mm. On the basis of numerical modeling, a satisfactory convergence of calculations carried out by the k-ω-SST model with the data obtained as a result of experimental studies is obtained. In the range of Rayleigh numbers greater than 85000, a slight monotonic increase of heat transfer was observed in the experimental data. At Ra of more than 100000, a slight but steady tendency of discrepancy between experimental and calculated data was observed. At the same time, the received data on the growth of heat transfer in the area of significant thermal loads (more than 10 W) corresponds to a physical picture of the investigated phenomena. However, the mathematical description in terms of the used model needs to be improved in order to take into account the peculiarities of heat transfer in spatial lattice structures under conditions of free convection.
Abstract
The paper presents the results of physical and mathematical modeling of heat transfer for radiators made on the basis of spatial lattice structures using laser sintering under conditions of free convection. The obtained data indicate that in a wide range of Ra numbers the maximum values of heat transfer correspond to the working section No. 2. At the same time, it is noted that the dependence of heat transfer on the mode parameter is of a complex nonlinear character and is confirmed by the peculiarities of physical processes occurring in lattice structures. The influence of the constraining channel on the heat transfer is revealed. It is determined that increasing height of the casing elevation decreases its influence on heat transfer. The maximum value of Nu corresponds to the height h = 5 mm. On the basis of numerical modeling, a satisfactory convergence of calculations carried out by the k-ω-SST model with the data obtained as a result of experimental studies is obtained. In the range of Rayleigh numbers greater than 85000, a slight monotonic increase of heat transfer was observed in the experimental data. At Ra of more than 100000, a slight but steady tendency of discrepancy between experimental and calculated data was observed. At the same time, the received data on the growth of heat transfer in the area of significant thermal loads (more than 10 W) corresponds to a physical picture of the investigated phenomena. However, the mathematical description in terms of the used model needs to be improved in order to take into account the peculiarities of heat transfer in spatial lattice structures under conditions of free convection.
Keywords: heat transfer intensification, spatial lattice structures, topological optimization, cooling systems, heat flow, additive technologies.
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