This paper presents a numerical procedure for modelling the thermal performance of ventilated hollow core slabs (VHCS). A turbulence model suitable for this purpose is identified first by considering a smooth horizontal pipe subjected to turbulent mixed convention conditions typical of VHCSs. Comparison of the fully-developed dimensionless velocity (u+) and temperature (T+) profiles as well as the Nusselt numbers (Nu) predicted by five different turbulence models against empirical expressions available in the literature shows that the Standard and Realisable k-ε models provide the best overall predictions of u+, T+ and Nu. Since the Standard k-ε model gives slightly better estimates of the Nu values, it is adopted to model the thermal performance of a VHCS geometry for which experimental thermal responses are reported in the literature. The numerical predictions of local temperatures within the VHCS agree well with the experimental measurements, and hence the Standard k-ε model is recommended here for the modeling of VHCSs.
A Numerical Procedure for Modelling the Thermal Performance of Ventilated Hollow Core Slabs / Faheem, Ahmed; Ranzi, Gianluca; Fiorito, Francesco; Lei, Cheng Wang (APPLIED MECHANICS AND MATERIALS). - In: Advances of computational mechanics in Australia selected, peer reviewed papers from the 2nd Australasian Conference on Computational Mechanics (ACCM 2015), November 30 - December 1, 2015, Brisbane, Australia / [a cura di] Yuantong Gu, Hong Guan, Emilie Sauret, Suvash Saha, Haifei Zhan, Rodney Persky. - [s.l] : Trans Tech Publications, 2016. - ISBN 978-3-03835-528-1. - pp. 12-17 [10.4028/www.scientific.net/AMM.846.12]
A Numerical Procedure for Modelling the Thermal Performance of Ventilated Hollow Core Slabs
FIORITO, Francesco;
2016-01-01
Abstract
This paper presents a numerical procedure for modelling the thermal performance of ventilated hollow core slabs (VHCS). A turbulence model suitable for this purpose is identified first by considering a smooth horizontal pipe subjected to turbulent mixed convention conditions typical of VHCSs. Comparison of the fully-developed dimensionless velocity (u+) and temperature (T+) profiles as well as the Nusselt numbers (Nu) predicted by five different turbulence models against empirical expressions available in the literature shows that the Standard and Realisable k-ε models provide the best overall predictions of u+, T+ and Nu. Since the Standard k-ε model gives slightly better estimates of the Nu values, it is adopted to model the thermal performance of a VHCS geometry for which experimental thermal responses are reported in the literature. The numerical predictions of local temperatures within the VHCS agree well with the experimental measurements, and hence the Standard k-ε model is recommended here for the modeling of VHCSs.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
