FORCED-CONVECTION IN BANKS OF INCLINED CYLINDERS AT LOW REYNOLDS-NUMBERS

This study documents the pressure drop and heat transfer through bundl es of parallel cylinders in a domain that has been overlooked, namely, low Reynolds numbers, arrays that are long in the direction of flow s uch that the flow is hydraulically and thermally fully developed, and cylinders inclined relative to the flow direction. The numerical resul ts cover the range 1 less-than-or-equal-to Re(D) less-than-or-equal-to 30, 0.72 less-than-or-equal-to Pr less-than-or-equal-to 100, 0.6 less -than-or-equal-to phi less-than-or-equal-to 0.95 and 0-degrees less-th an-or-equal-to beta less-than-or-equal-to 60-degrees, where phi is the porosity of the bundle as a saturated porous medium, and beta is the angle between the cylinder centerline and the direction perpendicular to the flow direction. The accuracy is verified by means of experiment al measurements of the pressure drop across a bundle with 115 cylinder s in the flow direction, in the range 8 < Re(D) < 50, 0.84 less-than-o r-equal-to phi less-than-or-equal-to 0.92 and 0-degrees less-than-or-e qual-to beta less-than-or-equal-to 60-degrees. The results show that s ignificant errors may occur if the available large-Re(D) information i s extrapolated to the domain covered by this study.