An Experimental Investigation of Heat Transfer Around A Tube in A Bank

An experimental investigation of heat transfer and flow around the second cylinder of three cylinders in cross flow of air was conducted. The cylinders were situated in tandem at equal distances between centers. Their in-line pitch ratio was in the range 1.3 ≦ c/d ≦ 5.0 (c = center-to-center distance; d = diameter); the Reynolds number was 40000. Heat transfer results indicate a strong dependence on the difference between the maximum static pressure on the surface and the static pressure at the front stagnation point of the second cylinder. The maximum local heat transfer around the second cylinder occurs at the position where the free vortex layer (free shear layer) shed from the first cylinder attaches. However, the turbulence intensity near the wall at this same position is lower than that at other angular positions.