Abstract
Flow pattern in tube banks in the fully developed region was studied. To study the flow near the cylinder surface, diffusional current distribution was measured by an electrochemical method and flow visualization was performed by the hydrogen bubble method.
Jet flow, formed at a part of the minimum spacing path between adjacent cylinders of the preceding row for the staggered type, reached the cylinder of the aimed row and affected the flow near the cylinder surface, while separated shear flow formed at a cylinder of the preceding row for the in-line type affected the flow near the surface. Also, accelerated flow formed at a part of the minimum spacing path of the aimed row affected the flow near the surface with decrease in pitch ratio, regardless of arrangement of tube banks.
Macroscopic flow pattern for the in-line type changed remarkably with decrease in pitch ratio, but the flow pattern for the staggered type hardly changed.
