Numerical Investigation of Laminar Flow and Heat Transfer in Circular Duct with Twisted Tape Inserted for Non-Newtonian Fluid
Author | : An Fu |
Publisher | : |
Total Pages | : 99 |
Release | : 2016 |
ISBN-10 | : OCLC:956655958 |
ISBN-13 | : |
Rating | : 4/5 (58 Downloads) |
Book excerpt: Computational modeling of fully developed laminar convection of shear thinning fluids in a straight circular pipe with a twisted tape insert is presented in this thesis. The non-Newtonian behavior is modeled by purely viscous power-law and modified power-law relationships. The twisted tape geometry is defined by twist ratio y and the non-Newtonian fluid is characterized by the power-law index n . Because of symmetry between both sides of the tape insert, only one half of the domain consisting of helically twisted semi-circular cross-sectional geometry is modeled. The governing equations of mass and momentum conservation are transformed in terms of stream function and vorticity. The vorticity transport and stream function equations are solved simultaneously with the axial velocity equation and the energy conservation equation using a finite volume method. Both uniform wall temperature (UWT) and uniform heat flux (UHF) boundary conditions are considered. The governing equation are solved with varying Reynolds number (100