A CFD BASED THERMO-HYRAULIC PERFORMANCE IN A TUBE FITTED WITH STEPPED CONICAL NOZZLE TURBULATORS


KEKLİKCİOĞLU O. , DAĞDEVİR T. , ÖZCEYHAN V.

International Conference on Advances in Mechanical Engineering, İstanbul, Turkey, 13 - 15 May 2015, vol.1, no.1, pp.716-722

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.716-722

Abstract

The paper presents a numerical analysis of heat transfer and
friction characteristics in stepped nozzle inserted tube. Nine
different configurations is used for numerical analysis. In the
first part of study, to certify the Nu (average Nusselt number)
and the f (average friction factor), the computational fluid
dynamics (CFD) models of tube with conical nozzle turbulators
are validated with the experimental results available in
literature. In the present work, the turbulators are thoroughly
inserted in the tube three different pitch ratios with various
Reynolds numbers ranging from 6000 to 22000 and also with
three step numbers. The investigations were carried out with
the RNG k-e turbulence model in CFD packaged program after
some different turbulence model were tried and grid
independency with three different grid model were analyzed for
the average Nusselt number and the average friction factor. As a
consequence, different configurations were investigated and the
results are presented.