Download Viscous Effects and Heat Transfer in a Calculation Method for Axialsymmetric Flow in Multistage Turbomachines Using the Stream Function - STUTTGART UNIV (GERMANY F R) INST FUER LUFTFAHRT-ANTRIEBE; Sandel,W. | ePub
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Apr 18, 2013 effects of viscous dissipation and wall conduction on steady mixed convection couette flow of heat generating/absorbing fluid.
Oct 27, 2020 acting as an energy source, viscous dissipation alters the temperature distributions which results to affect rate of heat transfer.
(2004) studied natural convection flow along a vertical wavy surface with uniform surface temperature in presence of heat generation/absorption.
Non-equilibrium conditions are included in the fluid dilatation expressions to characterise heat transfer effects between the solid fibres and surrounding viscous fluid. Porosity) and distributions of diameter and fibre orientation angles are easily considered in the modelling approach.
Volume 49, effects of the viscous dissipation and chemical reaction on casson nanofluid flow over the permeable stretching/shrinking sheet.
Inertial as well as viscous effects are considered in the momentum equation. The mathematical model for energy transport was based on the two-phase equation model, which does not employ local thermal equilibrium assumption between the fluid and the solid phases.
Heat transfer effects on free convection viscous dissipation flow past an inclined plate.
The effects of the solid volume fraction ϕ, thermal radiation parameter n r, nonlinear stretching sheet parameter n, and the viscous dissipation parameter ec on the flow and heat transfer characteristics are determined for three kinds of nanofluids: copper, alumina, and titanium oxide.
Effects of thermal radiation and viscous dissipation on magnetohydrodynamic stagnation point flow and heat transfer of nanofluid towards a stretching sheet.
Combined effects of thermal and mass diffusion on the natural convection flow of a viscous.
Heat-transfer effects that occur in the divergent portion of the nozzle become more pro- nounced. For such small, low-thrust nozzles, the boundary layer can account for a sub- stantial portion of the available nozzle flow area.
Effects of temperature-dependent viscosity on fluid flow and heat transfer in a helical rectangular duct with a finite pitch.
Abstract we investigate the effects of moving channel wall, thermal radiation and variable-thermal conductivity on the flow of a non-newtonian fluid in a porous.
Radiation effect on viscous flow of a nanofluid and heat transfer over a nonlinearly stretching sheet. Author information: (1)department of science and mathematics, faculty of education, assiut university, the new valley 72111, egypt.
Dynamic viscosity, thermal conductivity, density, and specific heat, as well as the fluid velocity viscous flows: flows in which the frictional effects are significant.
Heating effect on magneto hydromagnetic flow and heat transfer effects on a jeffrey fluid in view of a permeable stretching sheet with power-law heat flux and heat source by babu and narayana [33]. [34] examine the nanomaterials for the development of heat transfer and thermal conductivity features of non-newtonian fluids.
No-slip condition: a fluid in direct contact with a solid “sticks” to the surface due to viscous effects, and there is no slip.
Owing to the large surface area to volume ratio on the micro-scale, viscous forces and heat transfer from the flow into the substrate have the potential to significantly alter micro-nozzle flow.
Abstract in this analysis, the boundary layer viscous flow of nanofluids and heat transfer over a non-linearly-stretching sheet in the presence of a magnetic field is presented. Velocity and thermal slip conditions are considered instead of no slip conditions at the boundary. A similarity transformation set is used to transform the governing partial differential equations into non-linear.
However, the addition of particles to a fluid affects not only thermal conductivity (k), but also other macroscopic properties such as viscosity (η), heat capacity (cp) and density (ρ) that may differently affect the heat transfer characteristics of the nanofluid.
While in conventionally-sized channels viscous heating is commonly negligible, heat transfer characteristics can be considerably altered by viscous dissipation effects at smaller scales.
Loss is defined in terms of entropy increase and the relationship of this to the more familiar loss coefficients is derived and discussed. The sources of entropy are in general: viscous effects in boundary layers, viscous effects in mixing processes, shock waves and heat transfer across temperature differences.
The effects of various physical parameters, such as the magnetic parameter, the slip coefficient, the suction/injection parameter, the biot number, the prandtl number and the eckert number, on the flow and heat transfer characteristics are presented graphically and discussed.
The effects of viscous dissipation and temperature dependent viscosity in simultaneously developing laminar flows of liquids in straight microchannels are studied with reference to convective boundary conditions. Two different geometries, namely the circular tube and the parallel plate channel, are considered.
The problem of forced convection along an isothermal, constantly moving plate is a classical problem of fluid mechanics that has been solved.
Since viscous heating effect may strongly affect convection, and seemingly, there is a lack of information about flow characteristics of a viscous dissipative electromagnetohydrodynamic liquid slip flows. Therefore, the aim of this study is to find its effect on the convective heat transfer within parallel plate microchannels.
The effect of viscous dissipation and axial conduction on heat transfer for laminar forced convection flow through a circular pipe was studied. Constant wall temperature boundary condition was imposed on the circular pipe and the flow is assumed to be hydrodynamically developed and thermally developing.
The effect of temperature-dependent viscosity on heat transfer over a continuous moving surface.
Laminar free convection heat transfer of a viscous incompressible heat generating fluid-flow past a vertical porous plate in the presence of free-stream oscillations.
It was found that the presence of axial conduction and viscous dissipation has increasing effects on heat transfer in smooth and rough channels, compared to cases where they are neglected. Jeong investigated the extended graetz problem in a flat channel including effects of rarefaction, streamwise conduction and viscous dissipation.
The effects of viscous heating on the temperature profiles and on the heat transfer performance are analyzed in detail. It is concluded that the effect of viscous heating, like an internal energy source, heats the fluid along the flow direction and severely distorts the temperature profiles.
In general, the temperature increases in the velocity boundary layer because viscous effects convert the energy in the flow to heat. However, wall heat transfer can still suck that energy out, allowing for a wide variety of possible profiles.
El-kabeir and gorla [10] studied the heat transfer with temperature dependent viscosity in a viscous fluid over stretching sheet in the presence of viscous dissipation and internal heat generation. El-hakiem [11] has studied the effects transverse flows with variable viscosity in micropolar fluid.
Convective heat transfer is a graduate course focused on viscous effects and heat transfer taking place within fluids mostly at low subsonic speeds. We will derive the momentum equations and total energy energy equations of fluid flow using the fundamental laws of physics and then use those to solve basic problems involving heat.
Viscous dissipation effects on unsteady free convective flow past an infinite, vertical porous plate with constant suction.
The modeled transfer impedance of the coupler is shown in blue, including thermal and viscous losses, together with the prescribed standard curves in red and the curve resulting from a pure lossless model in green (right). The thermoviscous effect is typically most pronounced at resonances, broadening them and shifting them down in frequency.
In finding the average convection coefficient: the transition from laminar to turbulent flow is ultimately due to triggering mechanisms, such as the interaction of unsteady flow structures that develop naturally within the fluid or small disturban.
The effects of viscous dissipation involved in the heat transfer process and the body force because of the edl and the magnetic field are considered in the thermal energy and momentum equations for both regions. The detailed derivation procedure of the analytical solution for electrostatic potential is provided.
Where the heat transfer coefficient, α, is only a function of the flow field. T w is the wall temperature and t r, the recovery or adiabatic wall temperature. The above is also true of the boundary layer energy equation, which is a particular case of the general energy equation.
(2000) considered the flow of viscous incompressible fluid with temperature dependent viscosity and thermal conductivity past a permeable wedge with uniform.
The effect of viscous dissipation regulating the heat transfer is considered. In addition, prescribed power law surface temperature and prescribed power law surface heat flux boundary conditions are introduced. The transformed non-linear coupled governing equations are solved analytically using hyper geometric function.
Feb 25, 2021 the results predict a substantial drop in heat transfer rate whenever elasticity effects are present.
Jan 9, 2009 effects of varying viscosity and thermal conductivity on steady mhd free convective flow and heat transfer along an isothermal plate with.
Mar 31, 2020 ) examined the effect of heat source/sink on natural convection flow of viscous incompressible fluid between two vertical porous plates with.
The results presented herein provide a fundamental knowledge about the influence of viscous dissipation on the heat transfer characteristics. The results reported herein further show that the effect of brinkman number on heat transfer is strongly conditioned by the thermal boundary condition, prandtl number and the power law index.
Some heat transfer wise control volume chosen such that the viscous power term, (recall, as long as our control surface does not lie along a moving wall with friction, this viscous work term will be identically zero.
In the numerical solutions, effects of radiation and viscous dissipation on unsteady mhd boundary layer flow and heat transfer over a stretching sheet were considered. Constitutes a set of non-linear ordinary differential equations for which obtaining closed form solution is difficult.
Mar 29, 2018 the effect of magnetic parameter, thermal radiation parameter and temperature dependent viscosity on wire coating analysis has been.
The merits on the effects of viscous dissipation depend on whether the plate is being cooled or heated. The work of [21] deals with the effect of the viscous dissipation term along with temperature dependent heat source or sink on momentum, heat and mass transfer -elastic fluid flow visco over an accelerating surface.
Viscosity on mixed convection heat transfer along a moving surface. The effect viscosity and thermal conductivity effects on combined heat and mass transfer.
When a viscous fluid flows in contact with a tube at low velocity it will do so in a way which does not produce any intermixing of the fluid: the boundary layer, the fluid in contact with the tube, will have its velocity reduced slightly by viscous drag and heat will flow through the fluid out of (or into) the tube wall by conduction and/or.
Must be used and the effect of variable viscosity on heat transfer cannot be capitalized. Mohamed eissa (2000) studied the fully developed mhd laminar flow and heat transfer through a rectangular duct of a viscous incompressible electrically-conducting fluid.
[32] studied the mhd flow, and heat transfer with effects of buoyancy, viscous and joules dissipation over a nonlinear vertical stretching porous sheet with partial slip. Hsiao and lee [33] analyzed the conjugate heat and mass transfer for mhd mixed convection with viscous dissipation.
Heat transfer effect on viscoelastic fluid used as a coating material for wire with variable viscosity sarhad university of science and information technology,.
A numerical model is developed to study the effects of temperature-dependent viscosity on heat and mass transfer flow of magnetohydrodynamic(mhd).
Munir and gorla [3] have considered a two dimensional mixed convection flow of a viscous incompressible fluid of temperature dependent viscosity and thermal.
However, the effect of viscous heating on the nusselt number at greater values of knudsen number becomes insignificant. In the absence of viscous heating, increasing values of knudsen number lead to smaller values of nusselt number. Furthermore, it is observed that viscous heating causes singularities in nusselt number values.
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