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Showing 1 to 20 of 134 for “"Nusselt"”.
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Effect of Blowing Ratio on the Nusselt Number and Film Cooling Effectiveness Distributions of a Showerhead Film Cooled Blade in a Transonic Cascade
… flux gages to experimentally characterize the Nusselt number and film cooling effectiveness distributions over the surface of the blade. The blade was arranged in a two-dimensional, linear cascade within a transonic, blowdown type wind tunnel. The wind tunnel freestream conditions were varied …
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Heat Transfer from Multiple Row Arrays of Low Aspect Ratio Pin Fins
… with different flow incidence angles. The pin Nusselt numbers showed almost no dependence on pin spacing or flow incidence angle. Using an infrared thermogaphy technique, spatially-resolved Nusselt numbers were measured along the endwalls of each array. The endwall results showed that …
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A Numerical Study of Unsteady Natural Convective Heat Transfer From Thin, Two-Sided Heated Horizontal Plates of Various Shapes
… the width of the plate was used, the transient Nusselt number profiles for different shapes, were very different. When square root of the area was used as the length scale, the transient Nusselt number variations for different plate shapes were closer to each other, but still had significant …
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Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse
… on a curve surface, determine the variation of Nusselt numbers (NuD) along the curve surface in order to understand the heat transfer characteristics and study the effect of position (in the center, in the mid and in the end) and angle (α=90°, 60° and 30°) of jet impingement on curve surface, …
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Numerical study of jet impingement cooling on a smooth curve surface
… on a curve surface, determine the variation of Nusselt numbers (NuD) along the curve surface in order to understand the heat transfer characteristics and study the effect of position (in the center, in the mid and in the end) and angle (α=90°, 60° and 30°) of jet impingement on curve surface, …
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A Numerical And Interferometric Study Of Natural Convective Heat Transfer From Divided And Undivided Vertical Channels
… bottom of the channel gave the highest average Nusselt numbers for the dividing plate and the overall channel. At low Rayleigh number, when the plate is at the bottom of the channel, extending the channel walls above the plate increased the plate heat transfer by as much as a factor of four. At …
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Computation of heat transfer in turbine rotor blade cooling channels with angled rib turbulators
… angled ribs and channel orientation on the local Nusselt number ratios for leading and trailing surfaces in a two-pass square channel (AR=1) are compared to experimental data for Reynolds numbers from 5,000 to 25,000 and dimensionless rotation numbers from 0.0 to 0.118. The influence of V-shaped …
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Measurement and modeling of in-cylinder heat transfer with inflow-produced turbulence
… allowing the use of a perturbation method. Two Nusselt numbers were formulated based on the model results. The first was a complex valued Nusselt number. Previous work had demonstrated that a constant complex Nusselt number could effectively predict heat transfer throughout the cycle in cylinder …
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Vortex generator arrays in air-cooled condensers for power plant applications
… interacting and non-interacting vortices on the Nusselt number and pressure drop are observed for the two Reynolds numbers. The low-Re cases flow cleaner through the channel, pressure drop is slightly lower for the array in comparison to a straight-line formation for two VG pairs; however, the …
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Graetz problem for slip flow in a channel in the presence of axial conduction, viscous dissipation and flow work
… distribution and provide predictions for the Nusselt number. It is found that inclusion of axial conduction increases both the non-dimensional temperature and the Nusselt number at a given location. The effect of slip flow is to increase the non-dimensional temperature and decrease the Nusselt …
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Scaling of Convective Heat Transfer in Laminar and Turbulent Wall Jets With Effects of Freestream Flow and Forcing
… correlated as a function of Reynolds number. The Nusselt number dependence on Prandtl number, Reynolds number and the downstream location are obtained for both jet profiles and wall boundary conditions.The turbulent wall jet is experimentally investigated for jet Reynolds number varying between …
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Slip effect on stagnation-point flow past a permeable quadratically stretching or shrinking sheet
… on the skin friction coefficient, local Nusselt number and dimensionless velocity and temperature profiles are described graphically. Skin friction coefficient f'(0) and g'(0) increase as suction increases. For local Nusselt number h(0) decreases as suction increases. Furthermore, when …
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Thermally Developing Electro-Osmotic Convection in Circular Microchannels
… for both thermal boundary conditions. The local Nusselt number for the CHF boundary condition is shown to reduce to the classical slug flow thermal development for imposed constant wall heat flux, and is independent of Joule heating source magnitude. For the CWT boundary condition, a local …
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Studying 3D Spherical Shell Convection using ASPECT
… of the root mean square velocity (Vrms) and Nusselt number agree, often to within 1%. The 3D cases come from Zhong et al. (2008). Modifications were made to the simple.cc and harmonic_perturbation.cc files in the ASPECT code in order to reproduce the initial conditions and …
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Strongly-Coupled Conjugate Heat Transfer Investigation of Internal Cooling of Turbine Blades using the Immersed Boundary Method
… fluctuations in temperature, heat transfer and Nusselt numbers, it has an insignificantly small effect on the mean Nusselt number. The comparison between the IBM-LES-CHT and iso-flux simulations shows that the iso-flux case predicts higher local Nusselt numbers at the back face of the rib. …
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Velocity and temperature distributions for mercury in turbulent flow
… The velocity profiles, temperature profiles and Nusselt numbers are shown to be strongly influenced by free convection effects. Correlations are presented whereby the amount of distortion of the velocity profile from the isothermal profile under given conditions may be estimated, and the value of …
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Convective heat transfer in rotating, circular channels
Nusselt number values for flow in a rotating reference frame are obtained through computational fluid dynamic (CFD) analysis for Rossby numbers Ro ~1-4 and Reynolds numbers Re ~1,000-2,000. The heat-transfer model is first validated according to Nusselt number correlations for laminar, developing …
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Heat Transfer Analysis of an Oblique Jet Impingement Cooling on CMC Rough Surface
… down into segments, and individual segment Nusselt numbers are determined and plotted for the various impingement cases studied. Both experimental and CFD results showed negligible changes in average Nusselt number, while local contours were affected. The computational results were evaluated …
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Stagnation-point flow past a vertical stretching or shrinking sheets in a nanofluid with slip effect
… on the skin friction coefficient, C, , Iocal Nusselt number,Nu,and local Sherwood number,Sh,. Comparison with previously published results for the skin friction co-cfficient, f'(0). rale of heat transfer, -θ(0) and rate of mass transfer. -'(0) steady-slate case of the present problem is made, …
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Previsão para o desempenho ótimo de um duplo-tubo aletado para a transferência de um calor em regime laminar
… as a compact heat exchanger, appropriate Nusselt numbers are defined. The predictions of the global and optimum performance are made by means of the Nusselt number curves i.e., the relationship etween the Nusselt number, the boundary conditions and the geometric characteristics of the …
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