On the Simulation of Turbulent Heat Transfer for Low-Pr Fluid Cross-Flow in Tube Banks

2021 ◽  
Author(s):  
Alessandro Tassone ◽  
Jasper Meeusen ◽  
Andrea Serafini ◽  
Gianfranco Caruso
Keyword(s):  
Heat Transfer ◽  
Cross Flow ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Tube Banks

Heat Transfer in Thermal Barrier Coated Rods With Circumferential and Radial Temperature Gradients

1985 ◽  
Vol 107 (1) ◽  
pp. 135-141 ◽  
Author(s):  
B. T. F. Chung ◽  
M. M. Kermani ◽  
M. J. Braun ◽  
J. Padovan ◽  
R. C. Hendricks
Keyword(s):  
Heat Transfer ◽  
Angular Position ◽  
Cross Flow ◽  
Thermal Response ◽  
Axial Direction ◽  
Ambient Air ◽  
Ceramic Coatings ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Radial Temperature

To study the heat transfer in ceramic coatings applied to the heated side of internally cooled hot section components of the gas turbine engine, a mathematical model is developed for the thermal response of plasma-sprayed ZrO2-Y2 O3 ceramic materials with a Ni-Cr-AL-Y bond coat on a Rene 41 rod substrate subject to thermal cycling. This multilayered cylinder with temperature dependent thermal properties is heated in a cross-flow by a high veloctiy flame and then cooled by ambient air. Due to high temperature and high velocity of the flame, both gas radiation and forced convection are taken into consideration. Furthermore, the local turbulent heat transfer coefficient is employed which varies with angular position as well as the surface temperature. The transient two-dimensional (heat transfer along axial direction is neglected) temperature distribution of the composite cylinder is determined numerically.

scholarly journals Numerical Analysis of Turbulent Heat Transfer in the Case of Minijets Array

Symmetry ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1785
Author(s):  
Sebastian Gurgul ◽  
Tomasz Kura ◽  
Elzbieta Fornalik-Wajs
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Heated Surface ◽  
Cross Flow ◽  
Turbulent Heat Transfer ◽  
Tetragonal Symmetry ◽  
Strength Analysis ◽  
Turbulent Heat ◽  
Phase Array ◽  
Surface Geometry

The presented numerical investigations show an analysis of the turbulent single-phase array of ten minijets impinging a heated surface, which lead to the intensification of heat transfer between the fluid and the surface. Attention was devoted to the comparison between phenomena occurring for the heated flat and concave surface geometry. The selection of the shapes was based on the impinging jets applications. From the numerical point of view, the focus was placed on a comparison of the Reynolds Averaged Navier–Stokes (RANS) turbulence model implementations in ANSYS Fluent software, and their impact on the modeling precision of the thermal and hydrodynamic boundary layers phenomena. The 3D numerical model was based on the continuity, momentum, and energy transport equations, together with three various RANS turbulence models: k-ω SST Kato-Launder, k-ε RNG Kato-Launder, and Intermittency Transition. The water submerged minijets, characterized by three various values of Reynolds number, were considered. Average surface Nusselt number values for all analyzed cases were compared with the experimental correlations and exhibited the same tendency but differed in detail. Numerically obtained average Nusselt number values agreed with the results of two from three correlations in the range of 10–20%. The flat surface was characterized by higher heat transfer than the concave one and an influence of the cross flow, changing the symmetrical distribution of the Nusselt number, was more visible for it. A cross flow impact was found in fuzzy hexagonal or tetragonal symmetry of this distribution. Additionally, the areas of high temperature gradient values were identified in the region of the strongest jets’ interactions, which can be important for mechanical strength analysis.

Sign in / Sign up

Export Citation Format

Share Document