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|Title:||Study of the Cooling Efficiency of Furnace Fan’s shaft Equipped with Devices of Rod Type|
|Other Titles:||Исследование эффективности охлаждения вала печного вентилятора, оснащенного устройствами стержневого тип|
|Authors:||Zainullin, L. A.|
Kalganov, M. V.
Kalganov, D. V.
Spirin, N. A.
|Publisher:||National University of Science and Technology MISIS|
National University of Science and Technology MISiS
|Citation:||Study of the Cooling Efficiency of Furnace Fan’s shaft Equipped with Devices of Rod Type [Исследование эффективности охлаждения вала печного вентилятора, оснащенного устройствами стержневого тип] / L. A. Zainullin, M. V. Kalganov, D. V. Kalganov et al. — DOI 10.3390/su14031677 // Izvestiya Ferrous Metallurgy. — 2017. — Vol. 60. — Iss. 8. — P. 651-655.|
|Abstract:||The design of the air cooling device for the furnace fan’s shaft of rod type of three standard sizes is proposed. During the experiments at the experimental stand, the convective heat transfer from the surface of these devices to the environment at a different shaft rotation frequency was obtained critically. It was established that in the range of variation of the relative length of the rods from 3.3 to 6.1, a regime close to the self-similar mode takes place, where the heat transfer from their surface can be described by a universal dependence. In the range of variation of the relative length of the rods from 6.1 to 8.6, the experimental data are generalized in the form of a power law with a proportionality coefficient that depends on the ratio of the shaft diameter to the outer diameter of the device. The least coefficient of heat transfer from the external surface was found in ST-346 with the largest outside diameter and, correspondingly, the longest rods, which is apparently due to the fact that in the process of heat transfer from the shaft to the environment, the limiting heat exchange section is the heat supply by heat conduction along of the rods axis. The highest heat transfer coefficient under comparable conditions is observed in ST-286 with medium rods, where the heat supply is more balanced by thermal conductivity along the rods and its removal from their external surfaces by convection to the environment. When comparing the data obtained with CT-286 and CT-220, it was found that at the same shaft rotation frequency, the heat transfer coefficient over the surface of ST-286 is about 15–20 %, which is associated with a decrease in intensity of air blowing of shortened rods of ST-220 due to the decrease in their average linear speed of movement along the circumference. From the analysis of the obtained results, it follows that the most effective in comparable conditions is the device with a maximum diameter of 346 mm, where the dissipated thermal power in the steady state is 1.1 times higher than that of the device with a diameter of 286 mm and 2.0 times greater than for devices with a diameter of 220 mm. The obtained materials can be used in the design of heating and thermal furnaces using forced coolant circulation. © 2017 National University of Science and Technology MISIS. All rights reserved.|
|Keywords:||CONVECTIVE HEAT TRANSFER|
COOLING FAN SHAFT
FURNACE HIGH-TEMPERATURE FAN
|metadata.dc.description.sponsorship:||The work was financially supported by Act 211 of the Government of the Russian Federation, contract no. 02.A03.21.0006.|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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