Convective Heat Transfer And Drag Of Two Side-By-Side Tubes In The Narrow Channel At Different Reynolds Number

We studied numerically and experimentally convective heat transfer and drag of two side-by-side tubes in different arrangements in the narrow channel at the Reynolds number ranging from 8000 to 40000 in comparison with circular tubes. The visualization results of the flow structure in the wake behind the arrangements of the investigated tubes are presented. It is shown that the thermal and hydraulic performance of side-by-side drop-shaped tubes is by a factor of 1.2-2 higher than that of circular tubes due to a lower drag of drop-shaped tubes.