Journal ArticleDOI
Influence of internal channel geometry of gas turbine blade on flow structure and heat transfer
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In this paper, the influence of channel geometry on flow structure and heat transfer, and also their correlations on all the walls of a radial cooling passage model of a gas turbine blade.Abstract:
This paper presents the study of the influence of channel geometry on the flow structure and heat transfer, and also their correlations on all the walls of a radial cooling passage model of a gas turbine blade. The investigations focus on the heat transfer and aerodynamic measurements in the channel, which is an accurate representation of the configuration used in aeroengines. Correlations for the heat transfer coefficient and the pressure drop used in the design of internal cooling passages are often developed from simplified models. It is important to note that real engine passages do not have perfect rectangular cross sections, but include a corner fillets, ribs with fillet radii and a special orientation. Therefore, this work provides detailed fluid flow and heat transfer data for a model of radial cooling geometry which has very realistic features.read more
Citations
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Heat transfer enhancement, entropy generation and temperature uniformity analyses of shark-skin bionic modified microchannel heat sink
TL;DR: Inspired by the shark-skin bionic concept, four novel flow control devices are proposed in this paper to further enhance thermal performance with low entropy generation (S/S0), as well as to improve temperature uniformity.
Journal ArticleDOI
Optimization of Dimples in Microchannel Heat Sink with Impinging Jets — Part A: Mathematical Model and the Influence of Dimple Radius
TL;DR: In this article, a mathematical model was advanced for numerically analyzing the fluid flow and heat transfer characteristics of a microchannel heat sink with impinging jets and dimples (MHSIJD), and the velocity distribution, pressure drop, and thermal performance of MHSIJd were analyzed by varying the radii of dimples.
Journal ArticleDOI
Optimization of Dimples in Microchannel Heat Sink with Impinging Jets—Part B: the Influences of Dimple Height and Arrangement
TL;DR: In this article, the effect of dimple height and arrangement on the overall performance of a microchannel heat sink with impinging jets and dimples was numerically analyzed and the results showed that MHSIJD with higher dimples had better overall performance with dimple radius being fixed, creating a mismatch between the impinging hole and dimple can solve the issue caused by the drift phenomenon.
Journal ArticleDOI
Investigation of Heat Transfer Augmentation between the Ribbed Plates via Taguchi Approach and Computational Fluid Dynamics
TL;DR: In this article, the effect of rib height, rib spacing and Reynolds number on heat transfer and turbulent flow characteristics between the ribbed plates have been numerically studied in the duct.
Journal ArticleDOI
Modeling and analysis of cilia generated shear-rate dependant flow
S.Z. Abbas,Xiawa Wang +1 more
TL;DR: In this article, the authors illustrate the characteristics of the mass transfer of non-Newtonian fluid in a ciliated channel by assuming that a metachronal wave of cilia generates a two-dimensional wavy channel.
References
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Journal ArticleDOI
Use of Melting Point Surface Coatings for Local Convection Heat Transfer Measurements in Rectangular Channel Flows With 90-deg Turns
D. E. Metzger,D. E. Larson +1 more
TL;DR: Determination, a l'aide de revetements de surface a point de fusion precis, pour la determination des repartitions des nombres de Nusselt locaux pour le transfert de chaleur locaux dans des coudes a 90° de conduites rectangulaires.
Journal ArticleDOI
Effects of Rib Arrangements on Heat Transfer and Flow Behavior in a Rectangular Rib-Roughened Passage: Application to Cooling of Gas Turbine Blade Trailing Edge
TL;DR: In this paper, the oblique ribs were intended to function as secondary flow inducers as well as turbulators to improve the heat transfer of the bottom wall (one of the short side walls).
Journal ArticleDOI
Turbulent heat transfer measurements using liquid crystals
TL;DR: The transient method of measuring heat transfer coefficients that uses liquid crystals, since its beginnings in the early 1980s, has become one of the best ways of determining full surface distributions of heat transfer coefficient as mentioned in this paper.
High-resolution heat-transfer-coefficient maps applicable to compound-curve surfaces using liquid crystals in a transient wind tunnel
TL;DR: In this article, a transient heat transfer tunnel is used to reveal the movement of isothermal contours on the model using a surface coating of thermochromic liquid crystals that display distinctive colors at particular temperatures.
The measurement of local heat transfer coefficients in blade cooling geometries
Peter T. Ireland,Terry V. Jones +1 more
TL;DR: Mesure des coefficients de transfert de chaleur locaux dans le cas de refroidissement d'aubages as discussed by the authors, d'Aubages