Abstract
Time-dependent three-dimensional N-S and energy equations are solved numerically for the laminar flow and heat transfer in a curved tube with straight inlet and outlet sections. The results clearly explain the effects of curvature in the upstream of the straight section and the existence reverse flow in the main flow direction of the curved section. The heated section adopted only in the curved tube does not show much effect on the upstream straight section. In the reverse flow field which appeared in the curvature, profound heat flow was found to wards the upstream. To explain the reverse flow effects, the dissipation term in the main flow direction becomes important and can be treated numerically.
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