9 research outputs found
On the effect of permeable magmatic foam on heat transfer in channelized lava flow
No full textRosemarie Mohais, Balswaroop Bhat
Heat transfer of permeable discs rotating in a magnetic field
No full textPrint OnlyAn electrically conducting Newtonian fluid is squeezed between two parallel infinite axisymmetric discs placed in an orthogonal magnetic field. Both discs are permeable. The upper disc is allowed to rotate in its own plane while moving freely along the z-axis. The lower disc is fixed with respect to the z-axis, but is allowed to rotate within its own plane. This paper addresses two cases, the first where each disc is set at a constant uniform temperature, the temperature of the upper disc being higher than the temperature of the lower disc. Using a similarity solation for small Reynolds numbers, analytical and numerical solutions are derived through which the effects of the permeability on the temperature and heat transfer profiles of the fluid film are studied. In the first case, the heat transfer profile is affected by the disc permeability up to the limiting where the discs rotate at the same speed. The temperature profile however is unaffected. In the second case considered, the lower disc is subjected to a heat flux whilst keeping the upper disc at a uniform constant temperature. In the second case, analytical and numerical solutions show that although the temperature and heat transfer profiles are influenced by the temperature ratio of the disc, they however remain unaffected by disc rotation and disc permeability.Rosemarie Mohais and Balswaroop Bhat
How does permeability affect the heat transfer profile of fluid flow within a partially permeable channel with an accelerating surface velocity?
No full textA grid based infrastructure for environmental applications
No full textEnvironmental monitoring data should be transformed, by scientific analysis, into assessments of current ecosystem condition and in evolution trends in time and space. The local, regional and global scales scientific data analysis, involves information mining from several data sources, i.e. multispectral satellite remote sensing data, urban environmental monitoring stations and oceanic or coastal buoys. The huge data amount to process, the complexity of the environmental models adopted and the necessary distributed collaboration between scientists and government agencies, require specific cyberinfrastructures.
In this paper we present a Web Grid Portal prototype for environmental data processing, that aspires to provide distributed powerful computational resources able to process and to manage immense data set by a friendly graphical interface. Portal users can access to environmental data collected by different sources, process data using distributed computing resources and web applications or upload specific data processing applications
Plane viscous flows in a porous medium.
No full textThe methods employed by Martin [1971] and Chandna et al. [1982] to steady plane flows have
been applied to the plane viscous flows in a porous medium using the Darcy - Brinkman -
Lapwood equation. Various flows and corresponding geometries have been investigated
Heat transfer of coupled fluid flow within a channel with a permeable base
No full textWe examine the heat transfer in a Newtonian fluid confined within a channel with a lower permeable wall. The upper wall of the channel is impermeable and driven by an accelerating surface velocity. Through a similarity solution, the Navier-Stokes equations are reduced to a fourth-order differential equation: the analytical solutions of which determined for small Reynolds numbers show dependence of the temperature and heat transfer profiles on the slip parameter based on the properties of the porous channel base. For larger Reynolds numbers, numerical solutions for three main groups of solutions show that the Reynolds number strongly influences the heat transfer profile. However the slip conditions associated with the porous base of the channel can be used to alter these heat transfer profiles for large Reynolds numbers. The presence of a porous base in a channel can thus serve as an effective means of reducing or enhancing heat transfer performance in model systems.Rosemarie Mohais, Balswaroop Bhat
