EFFECTS OF REYNOLDS NUMBER, BAFFLE ANGLE, AND BAFFLE DISTANCE ON 3-D TURBULENT FLOW AND HEAT TRANSFER IN A CIRCULAR PIPE


TURGUT O. , Kizilirmak E.

THERMAL SCIENCE, cilt.19, sa.5, ss.1633-1648, 2015 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 19 Konu: 5
  • Basım Tarihi: 2015
  • Doi Numarası: 10.2298/tsci121011045t
  • Dergi Adı: THERMAL SCIENCE
  • Sayfa Sayıları: ss.1633-1648

Özet

In this study, steady-state 3-D turbulent forced convection flow and heat transfer characteristics in a circular pipe with baffles attached inside pipe have been numerically investigated under constant wall heat flux boundary condition. Numerical study has been carried out for Reynolds number of 3000-50,000, Prandtl number of 0.71, baffle distances s/D of 1, 2, and 3, and baffle angle alpha of 30 degrees-450 degrees. Ansys Fluent 12.0.1 software has been used to solve the flow field. It is observed that circular pipe having baffles has a higher Nusselt number and friction factor compared to the smooth circular pipe without baffles. Periodically fully developed conditions are obtained after a certain module. Maximum thermal performance factor is obtained for the baffle angle of 150 degrees. Results show that baffle distance, baffle angle, and Reynolds number play important role on both flow and heat transfer characteristics. All the numerical results are correlated within accuracy of +/-10% and +/-15% for average Nusselt number and Darcy friction factor, respectively.