Experiments and a model of turbulent exchange flow in a vertical pipe

Cholemari, Murali R. ; Arakeri, Jaywant H. (2005) Experiments and a model of turbulent exchange flow in a vertical pipe International Journal of Heat and Mass Transfer, 48 (21-22). pp. 4467-4473. ISSN 0017-9310

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2005.04.025


In this paper we present experimental measurements of buoyancy driven turbulent exchange flow in a vertical pipe (L/d ratios of 9-12). The flow is driven by an unstable density difference across the ends of the pipe, created using brine and distilled water. Away from either end, a fully developed region of turbulence exists with a linear density gradient. Using a mixing length model that accounts for the end effects, we obtain the turbulent scales and flux. The Nusselt number scales like the square root of the Rayleigh number (Nu ~ Ra1/2). We give an empirical relation to quantify the end effects and hence calculate the flux of the salt (NaCl) given the aspect ratio of the pipe and the overall density difference across it.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Turbulent Mixing; Exchange Flow; Mixing Length Model
ID Code:67950
Deposited On:02 Nov 2011 02:56
Last Modified:02 Nov 2011 02:56

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