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Ghione, A., Noel, B., Vinai, P. och Demazière, C. (2016) *Assessment of thermal–hydraulic correlations for narrow rectangular channels with high heat flux and coolant velocity*.

** BibTeX **

@article{

Ghione2016,

author={Ghione, Alberto and Noel, Brigitte and Vinai, Paolo and Demazière, Christophe},

title={Assessment of thermal–hydraulic correlations for narrow rectangular channels with high heat flux and coolant velocity},

journal={International Journal of Heat and Mass Transfer},

issn={0017-9310},

volume={99},

pages={344-356},

abstract={The focus of the paper is on the evaluation of the correlations for predicting single-phase friction, single- and two-phase forced convection heat transfer coefficients in rectangular narrow channels, where the wall heat flux and the coolant flow can reach relatively high values.
For this purpose, several correlations are reviewed and assessed against the SULTAN-JHR experiments. These tests were performed at CEA-Grenoble with upward water flow in two vertical uniformly heated narrow rectangular channels with gap of 1.51 and 2.16 mm. The experimental conditions range between 0.2 and 0.9 MPa for the pressure; 0.5–18 m/s for the coolant velocity and between 0.5 and 7.5 MW/m2 for the heat flux.
The use of an appropriate turbulent friction factor leads to good comparison with the experimental data.
The analysis of the single-phase turbulent heat transfer coefficient shows that the standard correlations (e.g. Dittus–Boelter) significantly under-estimate the heat transfer coefficient, especially at high Reynolds number. Therefore, new best-fitting correlations are derived. It is also observed that a reduction in gap size may lead to the enhancement of the heat transfer.
The heat transfer is also under-estimated in two-phase flow if standard correlations (e.g. Jens–Lottes) are employed; however, good comparison with the experimental data are obtained with more appropriate models for fully developed boiling, such as the Forster–Greif correlation.
The global accuracy associated to these correlations is also quantified in a rigorous manner.},

year={2016},

keywords={Narrow rectangular channels; Friction coefficient; Single-phase forced convection; Fully developed boiling},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 236185

A1 Ghione, Alberto

A1 Noel, Brigitte

A1 Vinai, Paolo

A1 Demazière, Christophe

T1 Assessment of thermal–hydraulic correlations for narrow rectangular channels with high heat flux and coolant velocity

YR 2016

JF International Journal of Heat and Mass Transfer

SN 0017-9310

VO 99

SP 344

OP 356

AB The focus of the paper is on the evaluation of the correlations for predicting single-phase friction, single- and two-phase forced convection heat transfer coefficients in rectangular narrow channels, where the wall heat flux and the coolant flow can reach relatively high values.
For this purpose, several correlations are reviewed and assessed against the SULTAN-JHR experiments. These tests were performed at CEA-Grenoble with upward water flow in two vertical uniformly heated narrow rectangular channels with gap of 1.51 and 2.16 mm. The experimental conditions range between 0.2 and 0.9 MPa for the pressure; 0.5–18 m/s for the coolant velocity and between 0.5 and 7.5 MW/m2 for the heat flux.
The use of an appropriate turbulent friction factor leads to good comparison with the experimental data.
The analysis of the single-phase turbulent heat transfer coefficient shows that the standard correlations (e.g. Dittus–Boelter) significantly under-estimate the heat transfer coefficient, especially at high Reynolds number. Therefore, new best-fitting correlations are derived. It is also observed that a reduction in gap size may lead to the enhancement of the heat transfer.
The heat transfer is also under-estimated in two-phase flow if standard correlations (e.g. Jens–Lottes) are employed; however, good comparison with the experimental data are obtained with more appropriate models for fully developed boiling, such as the Forster–Greif correlation.
The global accuracy associated to these correlations is also quantified in a rigorous manner.

LA eng

DO 10.1016/j.ijheatmasstransfer.2016.03.099

LK http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.03.099

OL 30