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Title of Journal: Meccanica

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Abbravation: Meccanica

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Springer Netherlands

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DOI

10.1016/0266-352x(92)90005-e

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1572-9648

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Centreline velocity decay characterisation in low

Authors: X Grandchamp A Van Hirtum X Pelorson
Publish Date: 2012/10/05
Volume: 48, Issue: 3, Pages: 567-583
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Abstract

The centreline velocity decay of round airflow jets issuing from extended conical diffusers with lengthtodiameter ratio 12≤L t /d≤20 is studied for moderate bulk Reynolds numbers 1131≤Re b ≤9054 The centreline velocity decay varies as a function of the initial conditions The functional correlation between the centreline velocity decay coefficient and the initial centreline turbulence level observed on convergent nozzles Malmström et al in J Fluid Mech 246363–377 1997 breaks down as the initial centreline turbulence level exceeds 20  In addition the centreline velocity decay coefficient expressed as function of the bulk velocity U b decreases for U b 3 m/s instead of initial mean velocity U 06 m/s as reported for convergent nozzles Malmström et al in J Fluid Mech 246363–377 1997 The asymptotic values of the decay coefficient for U b 3 m/s decrease linearly when expressed as function of the initial centreline turbulence intensity u 0/U 0 Studied flow and geometrical conditions are relevant to flow through the human upper airways

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