Abstract
Experimental investigations of the flow and heat transfer around two cylinders in cross flow (one of them in the wake of the other) has been carried out. Distributions of the static pressure coefficients and Nusselt number on the surfaces of both cylinders have been determined by measurements. Our experimental results and knowledge of the flow processes around the single cylinder enables us to form an idea of the mechanism and pattern of the flow between and around two cylinders, and also to explain the mutual influence of the cylinders and the characteristic changes of the form drag and mean heat transfer coefficient. Reynolds number was varied in the range 1.2 .10 4 ⩽ Re ⩽ 4.10 4 and the distance between the cylinders in the interval 1.6 ⩽ L/ D ⩽ 9. Two different characteristic flow patterns was found, depending on whether the distance between the cylinders is greater or smaller than 3.8 D. For L < 3.8 D the closed vortex region between the cylinders is formed. Mean Nusselt number for the 1st cylinder is proportional to Re 0.6, as for the single cylinder for all distances. Mean Nusselt number for the 2nd cylinder is proportional to Re 0.6 for L⪢ 2.7 D, and to Re 2 3 for L ⩽ 2.7 D.
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