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Showing 1 to 20 of 106 for “"Nusselt number"”.
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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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A Numerical Study of Unsteady Natural Convective Heat Transfer From Thin, Two-Sided Heated Horizontal Plates of Various Shapes
… unsteady natural convection at various Rayleigh numbers. The influence of varying the characteristic length scales, i.e., the width of the plate, the square root of the single-side surface area, and 4 times the total area divided by the total perimeter (4A/P) was studied. Ansys FLUENT was used to …
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Computation of heat transfer in turbine rotor blade cooling channels with angled rib turbulators
The effects of rotation and Reynolds number on heat transfer in rotating two-pass square and rectangular channels with smooth walls and walls with 45 degree angled and V-shaped rib turbulators were investigated numerically using an unstructured, incompressible, Reynolds-averaged Navier-Stokes flow …
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Heat Transfer from Multiple Row Arrays of Low Aspect Ratio Pin Fins
… arrays were tested through a range of Reynolds numbers between 5000 and 30,000 to determine the effects of pin spacing as well as aspect ratio on pin and endwall heat transfer. Experiments were also conducted to determine the independent effects of pin spacing and aspect ratio on arrays with …
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Vortex generator arrays in air-cooled condensers for power plant applications
… vortex generators (VG). A low and high Reynolds number case of 225 and 1123 is simulated which is representative of the lower and upper limits of the air velocity range between 1-5 m/s in a typical air-cooled condenser (ACC) system. The effects of interacting and non-interacting vortices on the …
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Graetz problem for slip flow in a channel in the presence of axial conduction, viscous dissipation and flow work
… flow is a good approximation when the Knudsen number, the ratio of the molecular mean free path to the channel width, is less than approximately 0.1. Our analysis includes the effects of viscous dissipation, flow work, and axial heat conduction. A series solution is used to solve for the …
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Scaling of Convective Heat Transfer in Laminar and Turbulent Wall Jets With Effects of Freestream Flow and Forcing
… and expressed as a function of Reynolds number for uniform and parabolic jet profiles. The local skin friction coefficient is observed to converge to the analytical self-similar solution at downstream locations. Since no analytical solution exists for the temperature field in either the …
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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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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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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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A Numerical And Interferometric Study Of Natural Convective Heat Transfer From Divided And Undivided Vertical Channels
… line. The study examined the effect of Rayleigh number, plate-to-channel length ratio, vertical plate position, and plate thickness on the heat transfer from the channel walls, the dividing plate and the channel as a whole.;Solutions to both the full elliptic and parabolic forms of the …
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Stagnation-point flow past a vertical stretching or shrinking sheets in a nanofluid with slip effect
… of various emerging parameters such as Prandtl number, Pr, Lewis number, Le, the stretching/shrinking parameter, 6 , Brwonian motion parameter,No,Thermophoresis parameter, Nt, shear stress, r,, , heat flux, q. and mass flux, q.. are investigated graphically on the skin friction coefficient, C, , …
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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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Measurements of in-cylinder heat transfer with inflow-produced turbulence
… successfully predicted with the use of a complex Nusselt number; since a complex number has both a magnitude and a phase, a complex Nusselt number can describe the phase shift between temperature and heat transfer. Quasi-steady heat transfer models, such as Newton's Law of Cooling, do not predict …
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Experimental determination of heat transfer and fluid flow over drift-emplaced canisters
… spacing between the canisters and the Reynolds number of the flow. Both natural and forced convection effects were investigated. Pressure drop data was acquired for a range of Reynolds numbers. The spacing between canisters was varied and the data was valid for d/D = 0.25, l/d = 7.33 and for …
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The Enhancement of Convective Heat Transfer in an Aluminum Oxide Nanoaerosol
… loading was varied over a range of flow Reynolds number. The results indicate up to a 36% increase in Nusselt number for a particle mass loading of 0.35% at a Reynolds number of 6,000. The enhanced heat transfer rate is an order of magnitude larger compared to results from experiments reported in …
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Solution of the laminar boundary layer of a semi-infinite flat plate given an impulsive change in velocity and temperature
… in the boundary layer and at any time. The local Nusselt number can also be determined from the thermal boundary layer thickness. The approximate solution was compared with exact steady-state and infinite-plate solutions of the energy equation and with a finite-difference solution of the unsteady …
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Heat Transfer Analysis of an Oblique Jet Impingement Cooling on CMC Rough Surface
… of 6.5 and 7 jet diameters and three Reynolds numbers, 11,000, 23,000 and 35,000, were selected. The test surface is broken down into segments, and individual segment Nusselt numbers are determined and plotted for the various impingement cases studied. Both experimental and CFD results showed …
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Showerhead Film Cooling Performance of a Turbine Vane at High Freestream Turbulence in a Transonic Cascade
… approaching boundary layer state, Reynolds number, Mach number, combustor-generated high freestream turbulence, turbulence length scale, and secondary flows just to name a few. Until computational methods are able to accurately simulate these factors affecting film cooling performance, …
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Flow Characteristics and Heat Transfer for Pressure and Electric Field Driven Laminar Flow With Temperature-Dependent Properties in a Pipe With Irregular Cross Section
… have a large effect on the secondary flow and Nusselt number. However, it has only a minor effect on axial velocity and friction factor.
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