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Showing 1 to 20 of 36 for “"thermal boundary layer"”.
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Thermal boundary layer development in dispersed flow film boiling
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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An Optical Method for Thermal Boundary Layer Measurements in a Moderatelyrarefied Gas
Made available in DSpace on 2014-12-05T19:15:59Z (GMT). No. of bitstreams: 1 6104344.pdf: 2703718 bytes, checksum: dd26657ce9e50ac99d7cf7ed0eb13df1 (MD5) Previous issue date: 1961
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An Experimental Investigation of Thermal Boundary Layer Structure and Heat Transfer in Oscillating Flows Using CARS Spectroscopy and Cold -Wire Anemometry
… description of the time-resolved structure of a thermal boundary layer in the oscillating flow. The cold-wire technique provides for increased data acquisition rates relative to CARS, at the expense of an ambiguous, systematic error associated with the intrusive nature of the probe. The cold-wire …
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Solution of the laminar boundary layer of a semi-infinite flat plate given an impulsive change in velocity and temperature
The laminar boundary layer over a semi-infinite flat plate which is impulsively set in motion in an incompressible fluid and which has a simultaneous step change in surface temperature was studied. An approximate method was derived which can be used to determine the thermal boundary layer thickness …
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Numerical study of heat source/sink effects on dissipative magnetic nanofluit flow from a non-linear inclined stretching and shirinking sheet
… investigate radiative MHD mixed convection boundary layer flow of nanofluid over a nonlinear inclined stretching and shrinking sheet in the presence of heat source/sink and vicious dissipation. The governing coupled nonlinear momentum and thermal boundary layer equation are transform into a …
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Coupling of Fluid & Solid Thermal Models to Correct Heat Flux Measurements Taken on Launch Vehicles
<p>Knowledge of aerothermally induced convective heat transfer and plume induced radiative heat transfer loads is essential to the design of thermal protection systems (TPS) for launch vehicles. These loads are measured via the cylindrical heat flux gauges that are flush mounted with the outer …
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Η ΔΟΜΗ ΤΟΥ ΤΥΡΒΩΔΟΥΣ ΠΕΔΙΟΥ ΘΕΡΜΟΚΡΑΣΙΑΣ ΠΑΝΩ ΑΠΟ ΘΕΡΜΑΙΝΟΜΕΝΕΣ ΕΠΙΦΑΝΕΙΕΣ
… INSTABILITIES CREATED WITHIN THE "CONVECTIVE" LAYER. IN THE CASE OF THE INCLINED PLATE THE FLOW FIELD WAS FOUND TO BE COMPLICATED EXHIBITING THE COMBINED CHARACTERISTICS OF A THERMAL BOUNDARY LAYER AND A FREE CONVECTION FLOW ABOVE A HORIZONTAL PLATE.
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An Experimental Study of Momentum and Thermal Transport in Flow Through Smooth- and Rough-Wall Microchannels
… well with macroscale predictions in both the thermally-developing and -developed regimes With increasing roughness, while an enhancement in local Nu is noted in the thermally-developing regime, no measurable influence is observed upon attainment of a thermally-developed state. These …
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Aspects of laminar free convection from a vertical plate
… is presented showing that the hydrodynamic boundary layer is equal to the thermal boundary layer. In the past it was simply assumed to be so, in order to limit the computations, and the assumption was justified by the excellent agreement between calculations and experimental data. An …
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Modeling and Simulation of Radiation from Electronic Transitions in Hypersonic Atmospheric Reentry Flow
… for hypersonic re-entry flows, via inclusion of thermal radiation, is sought. With temperatures reaching tens of thousands of degrees, radiation is known to be significant to chemical reaction rates and thermal boundary layer development, hence surface heat transfer and thermal ablation both to …
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The high temperature geochemistry of vanadium: From isotope ratios in ocean island basalt to thermal diffusion processes at the core-mantle boundary
… structure and oxygen fugacity variations during thermal diffusion. Thermal diffusion is a mass diffusion process driven by a temperature gradient which can generate substantial isotopic fractionation in silicate melts, causing heavy isotopes to be enriched at a gradient’s cold end. This could …
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Computational analysis of magnetohydrodynamics boundary layer flow of nanofluid over a stretching sheet in the presence of heat generation or absorption and chemical reaction
… is ratio of buoyancy to viscous forces in the boundary layer it causes an increase in the buoyancy forces relative to the viscous forces which influence the velocity in the boundary layer region. An increase in the heat source/sink parameter (S) results in the increase in velocity and …
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Heat transfer enhancement in a rectangular duct by using winglet and nanofluids
… These vortices disrupt the growth of the thermal boundary layer and serves to bring about heat transfer enhancement between the fluid and the fin surfaces. The geometrical configuration considered in this study is representative of a channel with winglets spread over three rows each row 13 …
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Heat Transfer Due to Particle-Wall Collisions in Suspension Flows
… By comparing the results using (a) adiabatic boundary conditions on the particle and (b) uniform, elevated temperature conditions on the particle, the contributions of fluid-mediated conduction and particle induced convection were successfully separated. Asymptotic solutions were used to …
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Seismic Imaging of Earth’s Core-Mantle Boundary using Diffracted Waves
Earth’s core-mantle boundary marks the transition from the rocky mantle to the liquid outer core and exhibits the most extreme velocity jump in the Earth’s radial seismic structure. In recent decades, seismological studies demonstrate that the seismic structure close to this boundary is far more …
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Ice scaling in continuous eutectic freeze crystallization
… demonstrated that the formation of an ice scale layer on the cooling surfaces of indirectly cooled crystallizers severely decreases heat transfer. This increases the mechanical energy requirements and overall operational cost of the process. The energy efficiency of EFC as a wastewater treatment …
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A study of flow and heat transfer of nanofluids: between two parallel plates, over a wedge and past a stretching sheet
… flow is studied firstly in the presence of thermal radiation, and secondly, in the presence of both thermal radiation and heat generation/absorption. The solutions are obtained by using homotopy perturbation method (HPM) and fourth-order Runge-Kutta with shooting technique (RK4). The flow of …
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A NUMERICAL STUDY OF NONLINEAR VISCOELASTIC FLOW AND NONISOTHERMAL POWER-LAW FLOW
… streamlines induced by the abrupt change of boundary temperature and subsequent velocity field rearrangement. In addition to the numerical solutions given, an analytical approximation method for the Graetz-Nusselt problem is also presented for comparison. This method divides the domain into …
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The thermal and mechanical structure of stable continental lithosphere within a dynamic mantle
… mantle is not only important for determining the thermal structure and the role of continental lithosphere in the Earth's heat loss system, but also for determining the deformation response of continental lithosphere. This thesis presents the results from numerical simulations and scaling analyses …
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Effects of lithospheric strength on convection in the Earth's mantle
… Convective instability at the base of a cold thermal boundary layer with temperature and strain-rate-dependent viscosity is investigated by defining a quantity, termed here the "available buoyancy," that takes into account the tradeoff between cold temperatures both promoting and resisting …
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