TY - JOUR
T1 - Prediction of Convective Heat Transfer Through Ribbed Channels Using a Lowe-Re Non-Linear k-e Model
AU - Raisee, M
AU - Noursadeghi, A
AU - Iacovides, Hector
PY - 2004
Y1 - 2004
N2 - A numerical investigation has been undertaken to study fluid flow and heat transfer through artificially rib-roughened channels. Such flows are of particular interest in internal cooling of advanced gas turbine blades. The main objective is to test the suitability of recently developed variants of the cubic non-linear k-e model for the prediction of cooling flows through ribbed passages. The numerical approach used in this study is the finite-volume method together with the SIMPLE algorithm. For the modelling of turbulence, the Launder and Sharma low-Re k-e model and a new version of the non-linear low-Re two equation model that have been recently shown to produce reliable thermal predictions in impinging jet flows and also flows through pipe expansions, have been employed. Both models have been used with the form of the length-scale correction term to the dissipation rate originally proposed by Yap and also more recently developed differential version, NYap. The numerical results over a range of flow parameters have been compared with the reported experimental data. The mean flow predictions show that both linear and non-linear k-e models with NYap can successfully reproduce the distribution of the measured streamwise velocity component, including the length and width of the separation bubble, formed downstream of each rib. As far as heat transfer predictions are concerned, the recent variant of the non-linear k-e leads to marked improvements in comparison to the original version of Craft et al. Further improvements in the thermal prediction result through the introduction of a differential form of the turbulent length scale correction term to the dissipation rate equation. The version of the non-linear k-e that has been shown in earlier studies to improve thermal predictions in pipe expansions and impinging jets; it is thus found to also produce reasonable heat transfer predictions in ribbed passages.
AB - A numerical investigation has been undertaken to study fluid flow and heat transfer through artificially rib-roughened channels. Such flows are of particular interest in internal cooling of advanced gas turbine blades. The main objective is to test the suitability of recently developed variants of the cubic non-linear k-e model for the prediction of cooling flows through ribbed passages. The numerical approach used in this study is the finite-volume method together with the SIMPLE algorithm. For the modelling of turbulence, the Launder and Sharma low-Re k-e model and a new version of the non-linear low-Re two equation model that have been recently shown to produce reliable thermal predictions in impinging jet flows and also flows through pipe expansions, have been employed. Both models have been used with the form of the length-scale correction term to the dissipation rate originally proposed by Yap and also more recently developed differential version, NYap. The numerical results over a range of flow parameters have been compared with the reported experimental data. The mean flow predictions show that both linear and non-linear k-e models with NYap can successfully reproduce the distribution of the measured streamwise velocity component, including the length and width of the separation bubble, formed downstream of each rib. As far as heat transfer predictions are concerned, the recent variant of the non-linear k-e leads to marked improvements in comparison to the original version of Craft et al. Further improvements in the thermal prediction result through the introduction of a differential form of the turbulent length scale correction term to the dissipation rate equation. The version of the non-linear k-e that has been shown in earlier studies to improve thermal predictions in pipe expansions and impinging jets; it is thus found to also produce reasonable heat transfer predictions in ribbed passages.
U2 - 10.1108/09615530410517968
DO - 10.1108/09615530410517968
M3 - Article
SN - 0961-5539
VL - 14
SP - 285
EP - 304
JO - International Journal for Numerical Methods for Heat and Fluid Flow
JF - International Journal for Numerical Methods for Heat and Fluid Flow
IS - 3
ER -