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

doi:10.1088/1674-1056/20/12/124701

Abstract This paper assesses the suitability of the inflow Reynolds number defined by Re_o ≡ U_oD/$\nu$ (here U_o and D are respectively the initial jet velocity and diameter while $\nu$ is kinematic viscosity) for a round air/air jet. Specifically an experimental investigation is performed for the influences of U_o, D and Re_o on the mean-velocity decay and spread coefficients (K_u, K_r) 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 K_u ∝ U_o and K_r ∝ 1/U_o for U_o < 5 m/s appear to work, while each coefficient approaches asymptotically to a constant for U_o > 6 m/s, regardless of the magnitudes of Re_o and D. It is revealed that Re_o 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 Re_o for turbulent free jets.

Keywords: turbulent jet momentum conservation Reynolds number

Received: 20 April 2011
Revised: 15 July 2011
Accepted manuscript online:

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).

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Mi Jian-Chun(米建春) and Du Cheng(杜诚) 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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Influences of initial velocity, diameter and Reynolds number on a circular turbulent air/air jet

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