Naslov
Numerical study of a sphere cooling by natural convection

Autori
Virag, Zdravko ; Živić, Marija ; Krizmanić, Severino ; Veljić, Nataša

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of 6th International Congress of Croatian Society of Mechanics / Smojver, I. ; Sorić, J. - Zagreb : Hrvatsko društvo za mehaniku (HDM), 2009

ISBN
978-953-7539-10-8

Skup
6th International Congress of Croatian Society of Mechanics

Mjesto i datum
Dubrovnik, Hrvatska, 30.09.2009. - 02.10.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
natural convection; sphere colling; lumped model

Sažetak
Two approaches for predicting the sphere cooling process were compared in terms of the accuracy of the volume averaged sphere temperature: (I) The full approach with heat conduction in the sphere and laminar natural convection in the fluid and (II) the lumped quasi-steady model approach based on Churchill’ s correlation function for steady state heat transfer. The solution of the full model depends on the Rayleigh number (Ra), the Biot number (Bi) and the sphere to fluid thermal diffusivity ratio (A). The lumped model gives fairly accurate results with respect to the full model (discrepancy in sphere temperature less than 4%) for Bi<0.05, A<50 and Ra>104. The accuracy of the lumped model decreases with increasing Bi and A and decreasing Ra.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA