Effect of heat transfer on stability and transition characteristics of boundary-layers

Stability and transition problems of two dimensional boundary-layers with heated walls have been studied numerically using the linear stability theory. Incompressible stability equations have been modified to account for the variation of temperature dependent fluid properties across the layer. The equations obtained have been solved with an efficient shoot-search technique. Low speed flows of air and water have been analyzed with a wide range of heat transfer rates. In addition to the mean velocity profile characteristics, variable viscosity and density terms in the stability equations also have considerable influence on the results of the stability and transition analysis.


Linear stability analysis in compressible, flat-plate boundary-layers
Özgen, Serkan (Island Press, 2008-01-01)
The stability problem of two-dimensional compressible flat-plate boundary layers is handled using the linear stability theory. The stability equations obtained from three-dimensional compressible Navier-Stokes equations are solved simultaneously with two-dimensional mean flow equations, using an efficient shoot-search technique for adiabatic wall condition. In the analysis, a wide range of Mach numbers extending well into the hypersonic range are considered for the mean flow, whereas both two- and three-dim...
Heat transfer effects on the stability of low speed plane Couette-Poiseuille flow
Oezgen, Serkan; Dursunkaya, Zafer; Ebrinc, Ali Asian (Springer Science and Business Media LLC, 2007-10-01)
The stability problem of low-speed plane Couette-Poiseuille flow of air under heat transfer effects is solved numerically using the linear stability theory. Stability equations obtained from two-dimensional equations of motion and their boundary conditions result in an eigenvalue problem that is solved using an efficient shoot-search technique. Variable fluid properties are accounted for both in the basic flow and the perturbation (stability) equations. A parametric study is performed in order to assess the...
Effects of optical design modifications on thermal performance of a highly reflective HfO2/SiO2/TiO2 three material coating
OCAK, M.; Sert, Cüneyt; Okutucu-Ozyurt, T. (Springer Science and Business Media LLC, 2018-02-01)
Effects of layer thickness modifications on laser induced temperature distribution inside three material, highly reflective thin film coatings are studied with numerical simulations. As a base design, a 21 layer coating composed of HfO2, SiO2 and TiO2 layers of quarter wave thickness is considered. First, the laser induced temperature distribution in this base design is obtained. Then the layer thicknesses of the base design are modified and the corresponding temperature distributions in four alternative no...
Effect of surface roughness in microchannels on heat transfer
Turgay, Metin Bilgehan; Güvenç Yazıcıoğlu, Almıla; Department of Mechanical Engineering (2008)
In this study, effect of surface roughness on convective heat transfer and fluid flow in two dimensional parallel plate microchannels is analyzed by numerically. For this purpose, single-phase, developing, laminar fluid flow at steady state and in the slip flow regime is considered. The continuity, momentum, and energy equations for Newtonian fluids are solved numerically for constant wall temperature boundary condition. Slip velocity and temperature jump at wall boundaries are imposed to observe the rarefa...
Effect of variable thermal conductivity and viscosity on single phase convective heat transfer in slip flow
KAKAÇ, SADIK; Güvenç Yazıcıoğlu, Almıla; Gozukara, Arif Cem (Springer Science and Business Media LLC, 2011-08-01)
For a variety of fields in which micro-mechanical systems and electronic components are used, fluid flow and heat transfer at the microscale needs to be understood and modeled with an acceptable reliability. In general, models are prepared by making some extensions to the conventional theories by including the scaling effects that become important for microscale. Some of these effects are; axial conduction, viscous dissipation, and rarefaction. In addition to these effects, temperature variable thermal cond...
Citation Formats
S. Özgen, “Effect of heat transfer on stability and transition characteristics of boundary-layers,” INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, pp. 4697–4712, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56137.