Abstract
Numerical analyses have been conducted for combined free and forced laminar convection of low-Prandtl-number fluids in a vertical pipe. The effects of both buoyancy force and axial heat conduction on the hydrodynamic and thermal characteristics are systematically investigated for the fluid heating and cooling with upward flow at Pe=0.7 to 71(Pγ=0.007 to 0.71 with Re=50 and 100) and |Gγ/Re|=10 to 500. At relatively high |Gγ/Re|, flow reversals are produced at the center of a pipe and near the wall in the heating and cooling cases, respectively. The regime of reverse flow is identified for both heating and cooling cases in Pe vs |Gγ/Re| coordinates. The axial conduction effect becomes significant and even dominant at very low Pe numbers. Numerical results are presented for velocity profiles, streamlines showing the occurrence of flow recirculation, temperature profiles, and distributions of the Nusselt number and wall shear stress with |Gγ/Re| as a parameter.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
