Experimental Study of Structure of Gas Flow in Tube Banks with Tube Axes Normal to Flow Part II ; On the Structure of Gas Flow in Single-Column , Single-Row, and Double-Rows Tube Banks

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This second report describes the experimental results about the gas flow between tubes arranged in single column, single row, and double rows. The word "column" indicates a line of tubes in the direction of the gas flow, and "row" indicates a line of tubes perpendicular to the direction of the gas flow. Visual observations disclose that the vortex formation region and the Coanda effect have dominant effects on the structure of the gas flow in the three types of tube banks. The variation of the Strouhal number with the tube spacing is strongly dependent on the size of the vortex formation region. The gap flow between adjacent tubes normal to the flow behaves as a two-dimensional jet. It was found that in some tube spacings, the jets coalesced with each other due to the Coanda effect, and in an extreme case, non-uniformity was observed in the bulk flow.
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