...-steady transient multistage CHT simulations, an analytical heat transfer correlation has been developed, since the commonly known calculation approaches from the literature are not suitable for this case. The presented heat transfer correlations describe the convective heat transfer separately at vane...

... velocity and the position of the swirler but are almost insensitive to changes in the length of the combustion chamber (CC). These observations imply that the resonance frequencies of the ITA feedback loop are governed by convective time scales. A scaling rule for ITA frequencies that relies on a model...

... involving the convection of an entropy spot is obtained. The behavior of the instability is analyzed using phenomenological description and classical signal analysis. One shows that the system can be better described by considering two reacting zones: a rich mainly premixed flame is located downstream...

... Nusselt numbers increase virtually and linearly with x , which is consistent with laminar flow over a free disk. At these relatively low Grashof numbers, it is probable that the effects of buoyancy are very small, and consequently laminar forced-convection dominates for the rotating disks...

... is performed on an elemental control volume in the leaf pack, which takes account of the heat conducted up the length of the solid leaf and that convected to the air stream. In the interests of model simplification, the key assumptions are as follows: Taking the Laplace transform of the above differential...

... between the different convection mechanisms that occur here. The generic approach to simulate the fluid region as a solid body only is kept, but conductivity is determined based on the local heat transfer mechanisms that occur in each of the according regions. As a solver, the commercial CFD code ansys...

... to reproduce the effects of mainstream–coolant interactions on convective heat loads. By validating the approach through a benchmark against time-averaged quantities, the transient data acquired were examined in order to better understand the unsteady behavior of the thermal load through a statistical analysis...

... convection lubrication machine bearings rotors Tilting pad journal bearings are commonly used in rotating machinery due to their inherent stability properties [( 1 2 )] Hence, an important amount of effort has been put during the last four decades in order to improve the quality and accuracy...

...D. Chatzikyriakou; S. P. Walker; B. Belhouachi; C. Narayanan; D. Lakehal; G. F. Hewitt During the reflood phase, following a loss-of-coolant-accident (LOCA), the main mechanism for the precursory cooling of the fuel is by convective heat transfer to the vapor, with the vapor being cooled...

.... If the temperature of liquid exceeds the threshold value, the vaporization fronts develop near to the line of contact of a vapor bubble and heater. Fronts of vaporization extend along a heater with constant speed. It is a direct transition from one phase convection to film boiling. Such scenario of crisis...

... temperature far from the bubble. A convective approach has been used to estimate the bubble temperature. The quasisteady one-dimensional model can be extensively used to conduct parametric studies useful for fast estimation of the overall performance of any geometric design. For complex geometry, three...

... due to heat convection on the rotor surface and the rotor end is adiabatic ( Q E = 0 ) . Case 3 is a limiting case of Case 1; the rotor end temperature is specified as the ambient temperature, T E = 15 ° C . Figure 25 presents centrifugal and thermal growths for Case...

... simulations. LES, including radiation, convective cooling, and air cooling, were combined with a reduced chemical scheme that predicts N O x emissions. Good agreement of the calculated flame position and shape with experimental data was found. The main parameters to characterize the flames are pressure...

... < 1.5 , and the flow structure was considered to be representative of that found in gas turbines. The steady-state computations used a 3D commercial CFD code. 19 07 2006 20 07 2006 swirling flow rotors stators convection gas turbines rotational flow coolants pipe flow...

...A. G. Straatman; N. C. Gallego; Q. Yu; B. E. Thompson Experiments are presented to quantify the convective heat transfer and hydrodynamic loss that is obtained by forcing water through blocks of porous carbon foam (PCF) heated from one side. The experiments were conducted in a small-scale water...

... of flow and heat transfer between LES, RANS, and measurement 01 10 2005 01 02 2006 convection flow simulation flow instability Navier-Stokes equations compressors discs (structures) gas turbines In order to achieve further improvements in turbomachinery internal air...

... Rayleigh–Bénard convection similar to that found in stationary enclosures. The computed streamlines in the r - θ plane show pairs of cyclonic and anti-cyclonic vortices; but, at the larger Rayleigh numbers, the computed isotherms suggest that the flow in the annulus is thermally mixed. At the higher...

... the formation of a CVP and horseshoe vortices, which are convected downstream. LES also reveals the intermittent formation of upright wake vortices from the horseshoe vortices on the ground toward the CVP. The dispersion of polydisperse spray droplets is computed using the stochastic parcel method. Atomization...

... tips that diminishes further away. Heat flux conducted through the bristles dissipates into the flow by a strong convection at the fence-height region. Demiroglu ( 5 ) developed a closed-form equation to calculate heat generation. He measured the temperature field over the rotor rim and fence-height...

... with aerodynamic diameter between 10 nm and 1 μm were examined. A constant solid-fuel thermal input of 8 kW was maintained. The combustion products were cooled from 1200 to 420°C during passage through the 4.2 m long reactor to simulate the temperatures experienced in the convection pass of a boiler. Fine particle...