This paper deals with a theoretical and experimental investigation of Rayle
igh-Benard convection in a magnetic fluid submitted simultaneously to a gra
dient of magnetic held and a gradient of temperature. With an annular Hele-
Shaw cell configuration, we show the possibility to simulate Rayleigh-Benar
d experiments and its control by a gradient of magnetic field in the absenc
e of gravity (g congruent to 0). (C) 1998 Elsevier Science Ltd. All rights
reserved.