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Journal of Thermal Science

, Volume 26, Issue 1, pp 54–59 | Cite as

Computational study on the influence of number of threads on the performance of single screw pump at high angular velocities

  • Jaison Philip
  • Abhilash Suryan
  • T.V. Sanand
  • P. Unnikrishnan Nair
  • S. Sivakumar
Article

Abstract

Fluid flow in a screw pump which rotates at very high angular velocity is numerically analyzed. In the present study, fluid flow in screw pumps under high Reynolds number, of the order of 105, is considered. Screw pump has two major elements, a plain shroud which is a stationary element and a rotating hub with helical grooves contained within the shroud. In this paper, three variants of hubs with different number of thread starts numbering six, eight and twelve in combination with a plain shroud is studied. Each of the three possible combinations are analyzed on the basis of pressure rise developed, efficiency and shaft power. It was seen that pressure rise, efficiency and shaft power increases as the number of threads increases in the range of mass flow rates studied.

Keywords

Screw pump Turbulent flow Angular velocity 

Nomenclature

De

Hydraulic diameter of the screw channel (m)

h

Height of the screw thread (m)

P

Pressure (Pa)

r

Average radius of the fluid domain (m)

Re

Reynolds number, 1111111

u

Velocity in x direction (m/s)

v

Velocity in y direction (m/s)

Vavg

Average velocity of the fluid in the screw channel

k

Turbulent kinetic energy

v

Velocity Vector

w

Velocity in z direction (m/s)

W

Cross sectional base width of the screw thread

ß, ß*

Turbulence model constants

ε

Turbulence dissipation rate

µ

Dynamic viscosity of the simulating fluid (kg/m-s)

ρ

Density of the simulating fluid (kg/m3)

σ

Turbulence model constants

ω

Specific dissipation rate

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Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Jaison Philip
    • 1
  • Abhilash Suryan
    • 1
  • T.V. Sanand
    • 2
  • P. Unnikrishnan Nair
    • 2
  • S. Sivakumar
    • 3
  1. 1.Department of Mechanical EngineeringCollege of Engineering TrivandrumKeralaIndia
  2. 2.Turbo Pump DivisionLPSC, ValiamalaTrivandrumIndia
  3. 3.Department of Mechanical EngineeringRajadhani Institute Engineering & TechnologyTrivandrumIndia

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