A suitable k-epsilon model for CFD simulation of pump-around jet mixing tank with moderate jet reynolds number

Satapan Phapatarinan,Santi Wattananusorn,Eakarach Bumrungthaichaichan,C Hamontree

doi:10.1051/matecconf/201819203010

Satapan Phapatarinan, Santi Wattananusorn + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/201819203010

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Abstract

This paper presents the appropriate turbulence model for predicting the overall mixing time inside an open 45° inclined side entry pump-around jet mixing tank with moderate jet Reynolds number of about 17,515. The model was carefully developed by using appropriate hexahedral grid arrangement and proper numerical methods. The two different k-epsilon turbulence models, including realizable k-epsilon model and low Reynolds number k-epsilon model, were simulated. The overall mixing times predicted by these turbulence models were compared with the previous data reported by Patwardhan (Chem. Eng. Sci. 57 (2002) 1307-1318). The results revealed that the low Reynolds number k-epsilon model was a suitable model for predicting the overall mixing time of jet mixing tank with moderate jet Reynolds number.

Highlights

Jet mixing is an important mixing device, which was firstly proposed by Fossett and Prosser [1]
B The overall mixing time was predicted by standard kepsilon (SKE) turbulence model and power law discretization scheme
The results reveal that the decay of centreline velocity for realizable k-epsilon model (RKE) is faster than that observed by low Reynolds number k-epsilon model (LRKE)

Summary

Introduction

Jet mixing is an important mixing device, which was firstly proposed by Fossett and Prosser [1]. It provides the various advantages, including simple design with non-moving part, inexpensive operating cost, and easy installation and maintenance. The liquid recirculation and entrainment inside the tank are driven by high velocity jet to mix the different components. The jet mixing tanks were experimentally studied to achieve the mixing time correlations. These correlations were case specific [2]. The computational fluid dynamics (CFD) has been adopted to address this problem and to illustrate the details of fluid flow and mixing inside the vessel

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Conclusion