Assessment of scale-adaptive turbulence modeling in coupled CFD-PBM 3D flow simulations of disperse liquid-liquid flow in a baffled stirred tank with particular emphasis on the dissipation rate

A method for the evaluation of time-resolved entropy production in isothermal and incompressible flow is presented. It is applied as a post-processing of the three-dimensional flow field obtained by time-resolved computational fluid dynamics with scale adaptive turbulence modeling. Wall functions for direct and turbulent entropy production are presented for a cell-centered finite volume method, implemented in the open source software OpenFOAM and validated on channel, asymmetric diffuser and periodic hill flow. Single- and two-blade centrifugal pump flow is considered for a wide range of load conditions. Results are compared to experimental data. Time-averaged analysis shows essentially the same loss density distribution among pump components for both pumps, with the impeller and volute region contributing the most, especially in off-design conditions. For both pumps, the losses exhibit significant fluctuations due to impeller-volute interactions. The fluctuation magnitude of loss density is in the same range as flow rate fluctuations and much smaller than pressure fluctuation magnitude. For the two-blade pump, loss fluctuation magnitude is smaller than for the single-blade pump. Distinct loss mechanisms are identified for different load conditions. Upon blade passage, a promoted or attenuated volute tongue separation is imposed at part or overload, respectively. In between blade passages, a direct connection from pump inlet to the discharge leads to enhanced flow rate and loss density fluctuations. Future work aims at extending this analysis to stronger off-design conditions in multi-blade pumps, where stochastic cycle fluctuations occur.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

hi@scite.ai

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Assessment of scale-adaptive turbulence modeling in coupled CFD-PBM 3D flow simulations of disperse liquid-liquid flow in a baffled stirred tank with particular emphasis on the dissipation rate

Cited by 3 publications

References 83 publications

Three-dimensional simulations of liquid/gas flow through radial centrifugal pumps and the effect of bubble coalescence and breakup on the formation of gas accumulations

Three-dimensional simulations of liquid/gas flow through radial centrifugal pumps and the effect of bubble coalescence and breakup on the formation of gas accumulations

Numerical and experimental study of inlet velocity effects on separation performance of hydrocyclones for purifying low-grade phosphate ore

Time-Resolved Local Loss Analysis of Single- and Two-Blade Pump Flow

Contact Info

Product

Resources

About