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Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Natural-Convective Heat Transfer from Vertical Walls of Cube and Square Prism in Air

Czeslaw Oleskowicz Popiel
Poznan University of Technology, Institute of Environmental Engineering, 60965 Poznan, Piotrowo 3A, Poland

Janusz Wojtkowiak
Poznan University of Technology, Institute of Environmental Engineering, 60965 Poznan, Piotrowo 3A, Poland

K. Bober
Poznan University of Technology, 60-965 Poznan, Piotrowo 3a, Poland

DOI: 10.1615/IHTC12.2000
6 pages

Resumo

This communication presents the results of experimental investigations on average natural-convection heat transfer from the isothermal vertical surfaces of a cube and vertical short and slender square prisms to air. For the convective heat transfer measurements a simple lumped capacitance method was used. Results of the validation experiment performed with the short circular cylinder (H/D=1.006) showed very good agreement with the formula of McAdams recommended for flat isothermal plate (where: H, D − height and diameter of the circular cylinder). Results of average heat transfer measurements obtained for a cube were correlated with the formula: NuH=0.949*RaH0.215 in the range 1.8*104<RaH<8*105, and for vertical square prisms with the formula: NuH=1.10*RaH0.2(H/W)0.1233 in the range 1.8*104<RaH<5.5*108 and 1<H/W<21 (where: NuH − average Nusselt number, RaH − Rayleigh number, H, W − height and width of the cube or square prisms).

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