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Chin. Phys. B, 2011, Vol. 20(12): 124701    DOI: 10.1088/1674-1056/20/12/124701

Influences of initial velocity, diameter and Reynolds number on a circular turbulent air/air jet

Mi Jian-Chun, Du Cheng
State Key Laboratory of Turbulence and Complex Systems, Peking University, Beijing 100871, China;Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China
Abstract  This paper assesses the suitability of the inflow Reynolds number defined by ReoUoD/ν (here Uo and D are respectively the initial jet velocity and diameter while ν is kinematic viscosity) for a round air/air jet. Specifically an experimental investigation is performed for the influences of Uo, D and Reo on the mean-velocity decay and spread coefficients (Ku, Kr) in the far field of a circular air jet into air from a smoothly contracting nozzle. Present measurements agree well with those previously obtained under similar inflow conditions. The relations KuUo and Kr ∝ 1/Uo for Uo < 5 m/s appear to work, while each coefficient approaches asymptotically to a constant for Uo > 6 m/s, regardless of the magnitudes of Reo and D. It is revealed that Reo may not be an appropriate dimensionless parameter to characterize the entire flow of a free air/air jet. This paper is the first paper that has challenged the suitability of Reo for turbulent free jets.
Keywords:  turbulent jet      momentum conservation      Reynolds number  
Received:  20 April 2011      Revised:  15 July 2011      Published:  15 December 2011
PACS:  47.27.-i (Turbulent flows)  
  47.27.wg (Turbulent jets)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10921202 and 11072005).

Cite this article: 

Mi Jian-Chun, Du Cheng Influences of initial velocity, diameter and Reynolds number on a circular turbulent air/air jet 2011 Chin. Phys. B 20 124701

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