Abstract
Natural convection heat transfer of air for turbulent flow in cavity is investigated using the lattice Boltzmann method (LBM). This study appraises existing scaling laws in previous studies and covers a range of Rayleigh number (Ra) between 105 and 109. It is found that the comparison of the results at low Ra excellently agrees with the results from the literature. The dimensionless distance of heated source in cavity is one of the important factors. The results also explain the mechanism of natural convection rate increasing with the Ra. When the dimensionless length of heat source is equal to 1/5 at Ra of 108, the flow in the enclosure still keeps soft turbulent convection. The flow in cavity becomes fully turbulent natural convection at Ra=109. The core region scaling seems to approach the behavior of a passive scalar as Ra increases, i.e. it changes from pure exponential to a stretched exponential scaling. It is noticed that the results obtained from the present LBM simulations are in good agreement with the Kolmogorov-law and Bolgiano-law.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
