Heat transport in pool boiling liquid 3He below 1 K

The heat transport characteristics of liquid 3He and 3He 4He liquid mixtures (37% 3He, 15% 3He) were measured under saturated vapour pressure between 0.5 K and 0.7 K. The temperature difference ΔT between the heated copper surface and the liquid just above the surface was measured as a function of the heat flux q ˙ . The transition from the convection and conduction region to the nucleate boiling region was observed clearly for each sample. The curves of q ˙ versus ΔT for increasing and decreasing heat flux reveal no hysteresis effect at 0.5 K, but one at 0.7 K.