Numerical studies for effect of geometrical parameters on water jet pump performance via entropy generation analysis

Muhammad Penta Helios; Wanchai Asvapoositkul

doi:10.15282/jmes.15.3.2021.10.0654

Authors

Muhammad Penta Helios The Joint Graduate School of Energy and Environment, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
Wanchai Asvapoositkul Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand. Phone: (662) 470-9123; Fax: (662) 470-9111 https://orcid.org/0000-0001-6525-1888

DOI:

https://doi.org/10.15282/jmes.15.3.2021.10.0654

Keywords:

Water jet pump, 2D axisymmetric model, entropy generation analysis, projection ratio, throat-aspect ratio

Abstract

This paper presented an implementation of entropy generation analysis in the main flow field of a water jet pump via the CFD method. This study aimed to identify the inefficient location of energy conversion and to analyse entropy generation sources in each region of the water jet pump. The 2D-axisymmetric model and realisable k-ε (RKE) turbulence model at steady-state conditions were performed to validate jet pump performance and to assess the entropy generation. Likewise, the effects of the projection ratio and throat-aspect ratio as independent parameters were investigated. As a result, the throat is the most inefficient part due to the high total entropy generation rate, following by diffuser part. Also, the entropy generation rate was assessed dominant than viscous dissipation due to the turbulent dissipation, which was caused by a turbulent shear stress layer of mixing the streams. In conclusion, the projection ratio influenced the growth of the shear stress layer as well as the entropy generation. Further, the throat-aspect ratio affected the distribution of entropy generation in the throat section. An appropriate combination of both parameters has an impact on the jet pump performance improvements reducing the entropy generation rate in the future.

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M. P. Helios, “Experimental study performance and entropy generation analysis of ejector,” Ph.D. dissertation, The Joint Graduate School of Energy and Environment, King Mongkut’s University of Technology Thonburi, Bangkok,Thailand, 2020.