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Experimental investigation of the heat transfer for non-circular tubes in a turbulent air cross flow

机译：Experimental investigation of the heat transfer for non-circular tubes in a turbulent air cross flow

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The purpose of this experimental study is to measure the drag and heat transfer coefficients of the non-circular tubes including square, elliptic, and cam-shape tubes in a turbulent air cross flow. Studies have been made at 0 degrees to 180 degrees angles of attack (alpha) and Reynolds numbers (Re) based on the equivalent diameter of a circular tube within the range of 1.4 x 10(4) Re-eq 7.5 x 10(.)(4) The equivalent diameter D-eq = 46 mm was chosen for the tubes. The results show that the minimum and maximum drag coefficients (C-d) belong to the cam-shape and square tubes at a = 0 degrees, respectively. The (C-d) of the cam-shape and square tubes are 60% less and 25% more than the equivalent circular tube, respectively. Also, the ratio of the average Nusselt number (Nu) to the drag coefficient, Nu/Cd, was used to compare non-circular tubes and with their equivalent circular ones. The results show that the maximum value belongs to the cam tube and the minimum occurs for the square tube at a = 0 degrees. The (Nu) over bar /C-d ratio of the cam tube is 128% more than the equivalent circular tube, while the square tube yields a (Nu) over bar /C-d ratio that is 13% less than its circular equivalent.

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