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International Heat Transfer Conference 13

ISBN Imprimer: 1-56700-226-9 (CD)
ISBN En ligne: 1-56700-225-0

MULTIPHYSICS MODELLING WITH SPH: FROM MACRO TO NANOSCALE HEAT TRANSFER

DOI: 10.1615/IHTC13.p30.290
page 21

Antonio C. M. Sousa
Departamento de Engenharia Mecânica; Universidade de Aveiro;Campus Universitário de Santiago; 3810-193 Aveiro-Portugal; and Department of Mechanical Engineering; University of New Brunswick; Fredericton, NB, Canada E3B 5A3

Résumé

The paper reports on recent advances of a novel numerical method - the Smoothed Particle Hydrodynamics (SPH) - a meshless particle-based Lagrangian fluid dynamics simulation technique, in which the fluid flow is represented by a collection of discrete elements or pseudo-particles. This methodology has been successful in a broad spectrum of problems, among others, forced and natural convective flow, low Reynolds number flow, interfacial flow, multiphase flow, flow in porous materials, chemically reactive flow, particulate flow, non-Newtonian flow, and environmental flows. In comparison to the Eulerian-based CFD methods, SPH has a few advantages, which make it particularly well suited to deal with transient heat transfer problems.
The current state-of-the-art with particular emphasis to heat transport will be reviewed primarily through case studies, for which sufficient background will be provided to assess their engineering/scientific relevance. Two particular case studies will be used to exemplify macro and nanoscale applications of the proposed methodology.
The first application deals with magnetohydrodynamic (MHD) turbulence control. A magnetic field applied in the transverse flow direction is effective in reducing the turbulence fluctuations and suppressing the near-wall streamwise vorticity by changing the mean velocity and temperature profile. In contrast to the extensive research effort dealing with MHD flows with an applied transverse magnetic field, little attention was paid to flows interacting with a streamwise magnetic field. The ability of a streamwise magnetic field on controlling the transition to turbulence of an electrically conducting fluid flow is analysed in this work.
The second application deals with non-Fourier heat transfer, i.e., when one or both of the following two conditions occur: (a) the mean free path of the energy carriers becomes comparable to or larger than the characteristic length scale of the device/system under consideration (Kn ≥ 0.01), and/or (b) when the time scale of the processes under consideration becomes comparable to or smaller than the relaxation time of the energy carriers. Thermal transport phenomena play a crucial role in the development of nanotechnology, and operation of submicron- and nano-devices. The ballistic-diffusive equation is used to model heat transport in a thin film.
The present research effort aims constructing a relatively flexible tool for heat transfer computations that encompasses a wide range of space scales and of physical phenomena.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION