Heat transport regimes in an inclined channel

In this paper we report measurements of the heat flux in a slightly tilted channel (angle less than 45 degree ), filled with water, that connects two chambers: the hot in the lower part and the cold on the top. We show that different regimes develop depending on the angle and the applied power. We p...

Full description

Saved in:
Bibliographic Details
Published in:Physics of fluids (1994) 2013-01, Vol.25 (1)
Main Authors: Riedinger, X, Tisserand, J-C, Seychelles, F, Castaing, B, Chilla, F
Format: Article
Language:English
Subjects:
Channels
Computational fluid dynamics
Fluid flow
Inertial
Laminar
Temperature gradient
Turbulence
Turbulent flow
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper we report measurements of the heat flux in a slightly tilted channel (angle less than 45 degree ), filled with water, that connects two chambers: the hot in the lower part and the cold on the top. We show that different regimes develop depending on the angle and the applied power. We put in evidence a hard turbulent regime, a soft turbulent regime, a laminar regime, and an intermittent one. In the last regime, the flow oscillates between laminar and turbulent, which locks the temperature gradient to a constant value. We characterize those regimes thanks to the measurement of the axial gradient of temperature and to the measurement of the power. We model them giving descriptions in term of Nusselt and Rayleigh numbers. The soft turbulence to hard turbulence transition is interpreted as the birth of the inertial range of developed turbulence. This transition, which appears in several systems, is particularly clear here, thanks to its consequences on heat transport properties.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.4774346