Journal of Visualization

, Volume 22, Issue 4, pp 795–807 | Cite as

Study on reduction in pressure losses in pipe bends using guide vanes

  • Reji Reghunathan Valsala
  • S. W. Son
  • Abhilash SuryanEmail author
  • Heuy Dong Kim
Regular Paper


The pipe bends are common elements in pipeline network of mechanical systems. The losses in pipes and bend are generally considered as insignificant and unavoidable. The recent trends in achieving a higher order of performance in machines led to optimization by reduction in minor energy losses. The usage of components with the higher surface finish is the main methodology adopted for minimizing frictional loss. In bends, especially in the case of turbulent flows, the losses are significant when comparing the frictional pipe losses. The viscous interaction between fluid layers is more in bends due to the presence of flow separation secondary swirling motion. The reduction in these interactions can be achieved by installing turning vane (guide vanes) inside the pipe bend. The current literature available lacks detailing of many included flow physics in bends and vaned bends. The present work focuses on flow characteristics on a 90° curved bend. Incompressible isothermal RANS solutions were performed using turbulence treatment with the k − ω SST model. The initial validation study is carried out with available experimental results. The bend downstream velocity distribution and bend wall pressure distribution are carried out. Further, the computational methodology is extended to bend with different vane configurations and for different Reynolds numbers. The velocity, wall pressure, swirl strength, turbulent kinetic energy, etc. are reported for downstream locations. The comparison of pressure loss through different cases and improvements in flow through bend due to the inclusion of vanes are discussed in this work.

Graphical abstract


Dean number Guide vanes Pipe bend Pressure drop Secondary flow 

List of symbols


Coefficient pressure


Diameter of pipe, m


Dean number


Acceleration due to gravity, m/s2


Resistance coefficient


Number of vanes


Pressure, Pa


Total pressure, Pa


Pressure drop, Pa


Radius of the bend, m


Reynolds number


Radial distance, m


Centerline length, m


Turbulent kinetic energy, J


Velocity, m/s

Greek symbols


Angular location in bend curvature


Ratio of pipe diameter to bend diameter


Density, kg/m3


Angular location in pipe wall


Shear stress, Pa


Dynamic viscosity, kg/(s m)



This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea (No. 20172010105200).


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Copyright information

© The Visualization Society of Japan 2019

Authors and Affiliations

  1. 1.Fluid Machinery Technology and Research CentreDaejoo MachineryDaeguSouth Korea
  2. 2.Department of Mechanical EngineeringCollege of Engineering TrivandrumTrivandrumIndia
  3. 3.Department of Mechanical EngineeringAndong National UniversityAndongSouth Korea

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