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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN En Línea: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.2017016937
pages 445-456


Amir F. Najafi
Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
Mojtaba Tahani
Faculty of New Sciences and Technologies, Tehran University, Tehran, Iran
Sepehr Govara
Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
Majid Najafpour
Faculty of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran


In the present research, by using the modification in some of geometrical parameters, the performance of viscous fluid centrifugal pumps has been improved. In other words, the effects of the inlet and outlet blade angles and passage width have been investigated. Numerical simulation of three-dimensional flow is carried out by an extended computational fluid dynamics (CFD) code. "k-ω SST", was chosen as the turbulence model and a high-resolution algorithm was used to solve the governing equations. The numerical results of impeller primary geometry have good compliance with the experimental ones. Through variations of these three characteristics, 18 different cases simultaneously were investigated. Analysis of the obtained results shows the efficiency and head of pump increase by reduction of the inlet blade angle and changes in the outlet blade angle and passage width. It is clear that with a 38.2 and 17.5 deg angle of the inlet and outlet blade, respectively, and a passage width of 21 mm, the head values and pump efficiency are optimized between the 18 cases.