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On the effect of flow direction on mixed convection from a horizontal cylinder
Author(s) -
Badr H. M.
Publication year - 1985
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.1650050102
Subject(s) - mechanics , cylinder , reynolds number , natural convection , combined forced and natural convection , flow (mathematics) , geometry , heat transfer , isothermal process , free surface , forced convection , physics , mathematics , geology , thermodynamics , turbulence
The influence of free stream direction on mixed (natural and forced) convective heat transfer from a circular cylinder is investigated. The cylinder, which has an isothermal surface, is placed with its axis horizontal and normal to the oncoming flow. The free stream direction varies between the vertically upward (parallel flow) and the vertically downward (contraflow) directions. The investigation is based on the time integration of the unsteady, two‐dimensional equations of motion and energy until reaching steady conditions. The study is limited to Reynolds numbers up to Re = 40 and Grashoff numbers of Gr = Re 2 . The results are compared with the available experimental data and the agreement is satisfactory.