scholarly journals The Influence of Repository Thermal Load on Multiphase Flow and Heat Transfer in the Unsaturated Zone of Yucca Mountain

2005 ◽  
Author(s):  
Yu-Shu Wu ◽  
S. Mukhopadhyay ◽  
K. Zhang ◽  
G.S. Bodvarsson
Keyword(s):  
Heat Transfer ◽  
Multiphase Flow ◽  
Unsaturated Zone ◽  
Thermal Load ◽  
Yucca Mountain ◽  
Flow And Heat Transfer

Effects of Upstream Step Geometry on Axisymmetric Converging Vane Endwall Secondary Flow and Heat Transfer at Transonic Conditions

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Zhigang Li ◽  
Luxuan Liu ◽  
Jun Li ◽  
Ridge A. Sibold ◽  
Wing F. Ng ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Secondary Flow ◽  
Thermal Load ◽  
Numerical Study ◽  
Guide Vane ◽  
Leading Edge ◽  
Step Height ◽  
Temperature History ◽  
Flow And Heat Transfer ◽  
High Thermal Load

This paper presents a detailed experimental and numerical study on the effects of upstream step geometry on the endwall secondary flow and heat transfer in a transonic linear turbine vane passage with axisymmetric converging endwalls. The upstream step geometry represents the misalignment between the combustor exit and the nozzle guide vane endwall. The experimental measurements were performed in a blowdown wind tunnel with an exit Mach number of 0.85 and an exit Re of 1.5×106. A high freestream turbulence level of 16% was set at the inlet, which represents the typical turbulence conditions in a gas turbine engine. Two upstream step geometries were tested for the same vane profile: a baseline configuration with a gap located 0.88Cx (43.8 mm) upstream of the vane leading edge (upstream step height = 0 mm) and a misaligned configuration with a backward-facing step located just before the gap at 0.88Cx (43.8 mm) upstream of the vane leading edge (step height = 4.45% span). The endwall temperature history was measured using transient infrared thermography, from which the endwall thermal load distribution, namely, Nusselt number, was derived. This paper also presents a comparison with computational fluid dynamics (CFD) predictions performed by solving the steady-state Reynolds-averaged Navier–Stokes with Reynolds stress model using the commercial CFD solver ansysfluent v.15. The CFD simulations were conducted at a range of different upstream step geometries: three forward-facing (upstream step geometries with step heights from −5.25% to 0% span), and five backward-facing, upstream step geometries (step heights from 0% to 6.56% span). These CFD results were used to highlight the link between heat transfer patterns and the secondary flow structures and explain the effects of upstream step geometry. Experimental and numerical results indicate that the backward-facing upstream step geometry will significantly enlarge the high thermal load region and result in an obvious increase (up to 140%) in the heat transfer coefficient (HTC) level, especially for arched regions around the vane leading edge. However, the forward-facing upstream geometry will modestly shrink the high thermal load region and reduce the HTC (by ∼10% to 40% decrease), especially for the suction side regions near the vane leading edge. The aerodynamic loss appears to have a slight increase (0.3–1.3%) because of the forward-facing upstream step geometry but is slightly reduced (by 0.1–0.3%) by the presence of the backward upstream step geometry.

CFD Modeling of the Multiphase Flow and Heat Transfer for Piston Gallery Cooling System

2007 ◽  
Author(s):  
Yong Yi ◽  
Madhusudhana Reddy ◽  
Mark Jarrett ◽  
Pin Shyu ◽  
Cletus Kinsey ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Multiphase Flow ◽  
Cooling System ◽  
Cfd Modeling ◽  
Flow And Heat Transfer

scholarly journals Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Metals ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 368 ◽  
Author(s):  
Peiyuan Ni ◽  
Mikael Ersson ◽  
Lage Jonsson ◽  
Ting-an Zhang ◽  
Pär JÖNSSON
Keyword(s):  
Heat Transfer ◽  
Multiphase Flow ◽  
Swirling Flow ◽  
Numerical Study ◽  
Flow And Heat Transfer
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