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Unsteady laminar boundary layers in a compressible stagnation flow
C. S. Vimala,G. Nath +1 more
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In this article, the authors considered the unsteady laminar compressible boundary-layer flow in the immediate vicinity of a two-dimensional stagnation point due to an incident stream whose velocity varies arbitrarily with time, and the governing partial differential equations involving both time and the independent similarity variable were transformed into new co-ordinates with finite ranges by means of a transformation which maps an infinite interval into a finite one.Abstract:
The unsteady laminar compressible boundary-layer flow in the immediate vicinity of a two-dimensional stagnation point due to an incident stream whose velocity varies arbitrarily with time is considered. The governing partial differential equations, involving both time and the independent similarity variable, are transformed into new co-ordinates with finite ranges by means of a transformation which maps an infinite interval into a finite one. The resulting equations are solved by converting them into a matrix equation through the application of implicit finite-difference formulae. Computations have been carried out for two particular unsteady free-stream velocity distributions: (i) a constantly accelerating stream and (ii) a fluctuating stream. The results show that in the former case both the skin-friction and the heat-transfer parameter increase steadily with time after a certain instant, while in the latter they oscillate, thus responding to the fluctuations in the free-stream velocity.read more
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Drop dynamics after impact on a solid wall: Theory and simulations
TL;DR: In this paper, the impact of a fluid drop onto a planar solid surface at high speed was studied and it was shown that at impact, kinetic energy dominates over surface energy and inertia dominates over viscous effects.
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Unsteady boundary-layer flow and heat transfer of a nanofluid over a permeable stretching/shrinking sheet
TL;DR: In this article, the unsteady boundary layer flow of a nanofluid over a permeable stretching/shrinking sheet is theoretically studied, and the governing partial differential equations are transformed into ordinary ones using a similarity transformation, before being solved numerically.
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Exact Solutions of the Unsteady Navier-Stokes Equations
TL;DR: The unsteady Navier-Stokes equations as discussed by the authors are a set of nonlinear partial differential equations with very few exact solutions, and there are three main categories: parallel, concentric and related solutions, Beltrami and related solution, and similarity solutions.
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Unsteady mixed convection flow in stagnation region adjacent to a vertical surface
TL;DR: In this article, the Navier-Stokes equations, the energy equation and the concentration equation, which are coupled nonlinear partial differential equations with three independent variables, have been reduced to a set of nonlinear ordinary differential equations.
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Unsteady, three-dimensional, boundary-layer flow due to a stretching surface
TL;DR: In this article, the authors investigated the effect of the velocities of the boundary layer flow over a continuously stretching surface when the velocity of the stretching surface varies arbitrarily with time and found that the skin friction, the heat transfer and the mass transfer parameters respond significantly to the time dependent stretching velocity, while the Prandtl number and the Schmidt number strongly affect the heat and mass transfer of diffusing species.
References
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Boundary layer theory
TL;DR: The flow laws of the actual flows at high Reynolds numbers differ considerably from those of the laminar flows treated in the preceding part, denoted as turbulence as discussed by the authors, and the actual flow is very different from that of the Poiseuille flow.
Journal ArticleDOI
The response of laminar skin friction and heat transfer to fluctuations in the stream velocity
TL;DR: In this article, the phase lag in heat transfer from a heated circular wire in a fluctuating stream, in the range of Reynolds number for which a laminar boundary layer exists, is analyzed mathematically.
Journal ArticleDOI
Heat and mass transfer at a general three- dimensional stagnation point.
TL;DR: Simultaneous effects of heat and mass transfer on properties of stagnation point flows analyzed over full range of velocity gradients as discussed by the authors, showing that mass transfer and heat transfer can affect the properties of point flows.
Unsteady laminar boundary-layer flow
TL;DR: In this paper, the laminar compressible boundary layer over an insulated flat plate moving with a time-dependent velocity has been analyzed in detail, and a group of parameters arise which, if large, provide that the classical "starting from rest" solution applies, and, if small, that the motion is quasi-steady.
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