Mi, J.Feng, B.Deo, R.Nathan, G.2010-07-192010-07-192009Acta Physica Sinica, 2009; 58(11):7756-77641000-32901000-3290http://hdl.handle.net/2440/59462We investigated in experiment the effect of exit Reynolds number on self-preservation of a turbulent plane jet. Centerline velocity statistics were measured in plane jets issuing from the same nozzle but, respectively, with seven Reynolds numbers varying between Re=4,582 and Re=57,735, where Re≡Ujh/ν (Uj being the momentum-averaged exit mean velocity, h the slot height and ν the kinematic viscosity). All measurements were conducted using single hot-wire anemometry and over an axial distance (x) of 40 h. These measurements revealed a significant Re-dependence of either the mean or turbulent flow field. As Re increases, the pace of the jet development decreases and, as a result, both the mean and turbulent properties reach their self-preserving states over a longer downstream distance (x). The centerline integral scale L for all jets grows linearly with x and the growth rate decreases as Re is increased. It is also found that the local Reynolds number ReL scales with x as ReL∝x1/2. The study suggests that differences of the self-preserving states observed may be related to the differences in the underlying turbulence structures in the near field of the seven jets.enCopyright 2009 Chinese Physical Societyplane jetReynolds numberself-preservationJournal article002009349310.7498/aps.58.77560002718352000582-s2.0-7124913368736990Nathan, G. [0000-0002-6922-848X]