Abstract
An experimental study was undertaken for developing turbulent mixed convection in a horizontal circular tube with strip-type inserts (longitudinal strip LS and crossed-strip CS inserts) for 6500 ⩽ Re ⩽ 19,500 and 5.82 × 10 4 ⩽ Gr ∗ ⩽ 9.78 × 10 7 . Temperature data were measured and heat transfer rates at different heat flux levels were calculated and correlated in the form of relevant parameters. The buoyancy effect was detailedly examined for 1.53 × 10 −4 ⩽ Gr ∗/Re 2 ⩽ 2.31 . It is found that the buoyancy effect has less influence for tubes with inserts compared to the bare tubes. Moreover, the heat transfer enhancement was found 2–3 times than those of bare tubes.
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