Library Subscription: Guest
Home Archives Thermal Letter Officers Future meetings Assembly for International Heat Transfer Conferences
International Heat Transfer Conference 10

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

OSCILLATORY FLOW TRANSITION OF THERMOCAPILLARY CONVECTION IN A MELTED POOL

D. Morvan
IMT & IMFM (CNRS UM34) Marseille, France

Ph. Bournot
IMT & IMFM (CNRS UM34) Marseille, France

A. Garino
IMT & IMFM (CNRS UM34) Marseille, France

DOI: 10.1615/IHTC10.1660
pages 91-96

Abstract

A two-dimensional laser surface remelting problem is numerically simulated The mathematical formulation of this multiphase problem is obtained using a continuum model, constructed from classical mixture theory. This formulation permits to construct a set of continuum conservation equations for pure or binary, solid-liquid phase change systems. The numerical resolution of this set of coupled partial differential equations is performed using a finite volume method associated with a PISO algorithm. The numerical results show the modifications caused by an increase of the free surface shear stress (represented by the Reynolds number Re) upon the stability of the I hermocapillary flow in the melting pool. The solutions exhibit a symmetry - breaking flow transition, oscillatory behavior at higher values of Re. The spectral analysis of temperature and velocity signals for particular points situated in the melted pool, show that these oscillations are at first mono -periodic then new frequencies appear generating a quasi -periodic behavior. These oscillations of the flow in the melted pool could induced the deformation of the free surface which could explain the formation of surface ripples observed during laser surface treatments (surface remelting, cladding) or laser welding.

Purchase $25.00 Check subscription Publication Ethics and Malpractice Recommend to my Librarian Bookmark this Page