Published 8 issues per year
ISSN Print: 1065-5131
ISSN Online: 1563-5074
Indexed in
Distributions of Local Heat Transfer Coefficient on Surfaces with Solid and Perforated Ribs
ABSTRACT
In this experimental investigation, the variations of the local heat transfer coefficient in rib-roughened turbine blade internal cooling passages are examined. Using liquid crystal thermometry, the detailed local heat transfer distributions are determined for turbulent flows through a long, straight, square test channel model with ribs of various configurations, including perforated ribs, on two opposite walls.
Angled and V-shaped solid ribs enhance more heat transfer than transverse solid ribs. Angled solid ribs cause very large spanwise variations of the local heat transfer distribution. With the highest overall heat transfer and relatively small spanwise heat transfer variation, V-shaped ribs are recommended for internal cooling of gas turbine blades. Perforated ribs enhance less heat transfer than solid ribs, because the jet streams leaving the holes interrupt and weaken flow reattachment on the wall downstream of a rib. Increasing the size or the number of holes, or the total hole area, lowers the overall heat transfer. The lower pressure drop caused by perforated ribs reduces the required pumping power, but does not improve the thermal performance.
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Ahn H. S., Lee S. W., Lau S. C., Banerjee D., Mass (Heat) Transfer Downstream of Blockages With Round and Elongated Holes in a Rectangular Channel, Journal of Heat Transfer, 129, 12, 2007. Crossref
-
Jia R. , Sunde´n B. , Faghri M. , Computational Analysis of Heat Transfer Enhancement in Square Ducts With V-Shaped Ribs: Turbine Blade Cooling , Journal of Heat Transfer, 127, 4, 2005. Crossref
-
Dabiri Dana, Digital particle image thermometry/velocimetry: a review, Experiments in Fluids, 46, 2, 2009. Crossref
-
Moon S. W. , Lau S. C. , Heat Transfer Between Blockages With Holes in a Rectangular Channel , Journal of Heat Transfer, 125, 4, 2003. Crossref
-
Lau S. C., Cervantes J., Han J. C., Rudolph R. J., Internal Cooling Near Trailing Edge of a Gas Turbine Airfoil With Cooling Airflow Through Blockages With Holes, Journal of Turbomachinery, 130, 3, 2008. Crossref
-
Lau S.C., Cervantes J., Han J.C., Rudolph R.J., Flannery K., Measurements of wall heat (mass) transfer for flow through blockages with round and square holes in a wide rectangular channel, International Journal of Heat and Mass Transfer, 46, 21, 2003. Crossref
-
Goldstein R.J, Eckert E.R.G, Ibele W.E, Patankar S.V, Simon T.W, Kuehn T.H, Strykowski P.J, Tamma K.K, Bar-Cohen A, Heberlein J.V.R, Davidson J.H, Bischof J, Kulacki F.A, Kortshagen U, Garrick S, Heat transfer: a review of 1998 literature, International Journal of Heat and Mass Transfer, 44, 2, 2001. Crossref
-
Superposition Method in One-Dimensional Transient Heat Conduction Problems, in Solving Direct and Inverse Heat Conduction Problems, 2006. Crossref
-
Zheng Daren, Wang Xinjun, Yuan Qi, The flow and heat transfer characteristics in a rectangular channel with convergent and divergent slit ribs, International Journal of Heat and Mass Transfer, 141, 2019. Crossref
-
Ye Yi, Li Xueying, Ren Jing, Jiang Hongde, Split of heat transfer regions and flow characteristics of perforated blockages with inclined holes for trailing edge cooling, Numerical Heat Transfer, Part A: Applications, 75, 1, 2019. Crossref
-
Kowalewski Tomasz, Ligrani Phillip, Dreizler Andreas, Schulz Christof, Fey Uwe, Temperature and Heat Flux, in Springer Handbook of Experimental Fluid Mechanics, 2007. Crossref
-
Ali Md Shaukat, Tariq Andallib, Gandhi B. K., Role of Chamfering Angles and Flow Through Slit on Heat Transfer Augmentation Behind a Surface-Mounted Rib, Journal of Heat Transfer, 138, 11, 2016. Crossref
-
Liu Jian, Hussain Safeer, Wang Wei, Xie Gongnan, Sundén Bengt, Experimental and numerical investigations of heat transfer and fluid flow in a rectangular channel with perforated ribs, International Communications in Heat and Mass Transfer, 121, 2021. Crossref
-
Nonino C., Comini G., Convective heat transfer in ribbed square channels, International Journal of Numerical Methods for Heat & Fluid Flow, 12, 5, 2002. Crossref