Conjugate heat transfer due to conduction, natural convection, and radiation from a vertical hollow cylinder with finite thickness

Transient characteristics of coupled thermal radiation and natural convection in a 3-D cylindrical cavity containing a heated plate

“…Table 1 shows the variation of average Nusselt numbers with an increase of the number of grids. The difference was below 0.2% when the grid number reached 10.2×10 5 . Hence, the grid number 10.2×10 5 was adopted for the simulations.…”

“…Understanding combined natural convection and surface radiation in closed cavities has drawn tremendous interest due to its importance in substantial practical applications, including thermal cycling systems, nuclear reactors, chemical apparatus, data centre cooling, etc. Many of these applications can be simplified into physical models in which both natural convection and surface radiation heat transfer happen in a closed cavity containing or not an internal heat source [1][2][3][4][5][6][7][8][9][10][11][12].…”

“…In engineering applications such as cooling problems, cylindrical hollow cavities are widely used, and they often have flow structures and thermal fields that are three-dimensional in space. [5,[15][16][17][18][19][20] Ghernoug et al [15] numerically analyzed the effect of the Grashof number on natural convection in an annular space between two eccentric horizontal cylinders. It was found that the thermal conduction was the dominant heat transfer regime for Grashof numbers lower than 5×10 4 , while the convection governed the heat transfer and increased the value of the stream function for 5 × 10 4 < Gr < 1 × 10 6 .…”

“…The locally distributed Nusselt number at the inner and outer cylinders confirmed that thermal radiation was the dominant mode of heat transfer. An investigation of the coupled heat transfer in a vertical hollow cylinder with finite wall thickness was carried out by Chandrakar et al [5], where correlations for Nusselt number were proposed that considered both natural convection and surface radiation.…”

Improvement of the heat transfer quality by air cooling of three‐heated obstacles in a horizontal channel using the lattice Boltzmann method

“…Conjugate heat transfer in a horizontal channel with wall-mounted obstacles is considered an attractive research topic due to the progress of high-performance electronic equipment in several engineering and industrial fields, particularly the cooling of the electronics system and the heat exchangers using different cooling systems depending on the studied fluid such as airor water-cooling system, and nanofluids cooling, which are mainly employed for their improved thermal properties as coolants in heat transfer devices such as heat exchangers, electronic cooling plates and radiators… 1,2 Therefore, many researchers adopt different numerical methods to investigate this type of problem. [3][4][5][6][7][8] Roy al. 9 analyzed experimentally the heat transfer of an array of aluminum obstacles in a horizontal airflow duct.…”