Abstract
Exploratory experiments are described that investigate 3He–4He mixtures near the tricritical point as convection systems. Measurements of the temperature difference between the horizontal boundaries of a convection cell heated from above exhibit features attributable to phase separation and the bulk superfluid transition but show no feature consistent with the onset of stationary convection. The presence of convection is inferred from enhanced thermal conduction and the existence of a time-dependent state showing similarities to Busse's oscillatory instability. The effect of superfluid film flow was very noticeable and measurements of the film superfluid transition temperature are presented for four concentrations of 3He in 4He.
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