Title: An Experimental Study of Air Flow and Heat Transfer over in–Line Flat Tube Bank
Abstract: An experimental study was made to investigate heat transfer and air flow around the flat tubes of in-line flat tube banks with laminar forced convection.Measurements were conducted for sixteen tubes in the flow direction; four rows of four tubes, three air velocities (0.6, 0.8 and 1.0 m/s) and Reynolds numbers Re Dh = 527, 703 and 880, where D h is the hydraulic diameter of the tube.The total heat flux supplied in all the tubes was 968, 2259 and 3630 W/m 2 , respectively.The study results indicate that the average Nusselt number of all the flat tubes increased by 23.7%-36.7%with Reynolds numbers varying from 527 to 880 with fixed heat flux; also the average Nusselt number increased by 11.78%-23.75% at varying heat fluxes of 968, 2259 and 3630 W/m 2 , respectively at Reynolds number Re = 703.In addition, the pressure drop decreased with the increase of Reynolds number.The Nusselt number-Reynolds number correlation was found to be 2 1 C Nu C Re and the correlation yielded good predictions of the measured data with the mean error R 2 = 99.2%.