CFD analýza přestupu tepla v míchané nádobě se středovou trubkou

Abstract

Computational fluid dynamics (CFD) analysis of heat transfer in agitated vessel with a draft tube was performed by using Moving Reference Frame (MRF) approach and SST k-w model in ANSYS Fluent. First, simulations for different time intervals (0-200 seconds) were run to compare the heat transfer coefficient from Fluent and energy balance. In addition, a proper simulation time interval was found for the following set of simulations. Next, simulations for different rotational speeds were performed, applying SST k-w model with different options activated, in order to compare which method fits better with published correlations. As a result, SST k-w model with Production Limiter and Production Kato-Launder was used for the subsequent simulations for different position of the draft tube with respect to the vessel bottom (h/d= 0,5 and 0,25). A correlation describing Nusselt number in terms of the Reynolds number, Prandtl number and dimensionless distance (h/d) was obtained and was compared with published correlations.

Computational fluid dynamics (CFD) analysis of heat transfer in agitated vessel with a draft tube was performed by using Moving Reference Frame (MRF) approach and SST k-w model in ANSYS Fluent. First, simulations for different time intervals (0-200 seconds) were run to compare the heat transfer coefficient from Fluent and energy balance. In addition, a proper simulation time interval was found for the following set of simulations. Next, simulations for different rotational speeds were performed, applying SST k-w model with different options activated, in order to compare which method fits better with published correlations. As a result, SST k-w model with Production Limiter and Production Kato-Launder was used for the subsequent simulations for different position of the draft tube with respect to the vessel bottom (h/d= 0,5 and 0,25). A correlation describing Nusselt number in terms of the Reynolds number, Prandtl number and dimensionless distance (h/d) was obtained and was compared with published correlations.