A numerical method is developed to solve the coupled boundary layer equations for turbulent flow of a gas with large property variations in a circular tube. Uniform and fully developed entering velocity profiles are treated. Axial variation of the heating rate is permitted and is used for comparison with experiments.
Cases treated include: (1) constant fluid properties, laminar flow with variation of hydrodynamic entrance length; (2) variable, idealized air properties with uniform laminar entering velocity profile; (3) constant properties, fully developed turbulent flow in the immediate thermal entry region; (4) constant fluid properties, turbulent flow, with uniform entering velocity profile; (5) variable, idealized air properties and real gas properties, turbulent flow at heating rates to (qwGcp,iTi) = 0·02.
Predictions for several turbulent transport models are compared to an experiment with a peak wall temperature ratio (TwTi) of about 12, and the model yielding the closest agreement in the thermal entry region, a version of van Driest's mixing-length model, is used for further predictions.
Beschreibung
ScienceDirect.com - International Journal of Heat and Mass Transfer - Turbulent and laminar heat transfer to gases with varying properties in the entry region of circular ducts
%0 Journal Article
%1 Bankston1970319
%A Bankston, C.A.
%A McEligot, D.M.
%D 1970
%J International Journal of Heat and Mass Transfer
%K 1970 heat-transfer laminar turbulent
%N 2
%P 319 - 344
%R 10.1016/0017-9310(70)90110-9
%T Turbulent and laminar heat transfer to gases with varying properties in the entry region of circular ducts
%U http://dx.doi.org/10.1016/0017-9310(70)90110-9
%V 13
%X A numerical method is developed to solve the coupled boundary layer equations for turbulent flow of a gas with large property variations in a circular tube. Uniform and fully developed entering velocity profiles are treated. Axial variation of the heating rate is permitted and is used for comparison with experiments.
Cases treated include: (1) constant fluid properties, laminar flow with variation of hydrodynamic entrance length; (2) variable, idealized air properties with uniform laminar entering velocity profile; (3) constant properties, fully developed turbulent flow in the immediate thermal entry region; (4) constant fluid properties, turbulent flow, with uniform entering velocity profile; (5) variable, idealized air properties and real gas properties, turbulent flow at heating rates to (qwGcp,iTi) = 0·02.
Predictions for several turbulent transport models are compared to an experiment with a peak wall temperature ratio (TwTi) of about 12, and the model yielding the closest agreement in the thermal entry region, a version of van Driest's mixing-length model, is used for further predictions.
@article{Bankston1970319,
abstract = {A numerical method is developed to solve the coupled boundary layer equations for turbulent flow of a gas with large property variations in a circular tube. Uniform and fully developed entering velocity profiles are treated. Axial variation of the heating rate is permitted and is used for comparison with experiments.
Cases treated include: (1) constant fluid properties, laminar flow with variation of hydrodynamic entrance length; (2) variable, idealized air properties with uniform laminar entering velocity profile; (3) constant properties, fully developed turbulent flow in the immediate thermal entry region; (4) constant fluid properties, turbulent flow, with uniform entering velocity profile; (5) variable, idealized air properties and real gas properties, turbulent flow at heating rates to (qwGcp,iTi) = 0·02.
Predictions for several turbulent transport models are compared to an experiment with a peak wall temperature ratio (TwTi) of about 12, and the model yielding the closest agreement in the thermal entry region, a version of van Driest's mixing-length model, is used for further predictions.},
added-at = {2012-04-26T10:47:39.000+0200},
author = {Bankston, C.A. and McEligot, D.M.},
biburl = {https://www.bibsonomy.org/bibtex/2e15b120248e5701533d4da73cfb42f8f/thorade},
description = {ScienceDirect.com - International Journal of Heat and Mass Transfer - Turbulent and laminar heat transfer to gases with varying properties in the entry region of circular ducts},
doi = {10.1016/0017-9310(70)90110-9},
interhash = {4312fbe2c1c09df47060605159f1cbce},
intrahash = {e15b120248e5701533d4da73cfb42f8f},
issn = {0017-9310},
journal = {International Journal of Heat and Mass Transfer},
keywords = {1970 heat-transfer laminar turbulent},
number = 2,
pages = {319 - 344},
timestamp = {2012-04-26T10:47:39.000+0200},
title = {Turbulent and laminar heat transfer to gases with varying properties in the entry region of circular ducts},
url = {http://dx.doi.org/10.1016/0017-9310(70)90110-9},
volume = 13,
year = 1970
}