A single tube evaporator was designed for investigating heat transter coefficients of liquid metals .t either horizontal or vertical position. The heating element

the evaporating vessel and the :ondenser were made of stainless steel. The liquid metals employed were mercury

and amalgams containing various amounts of magne-ium and sodium. The boiling heat transfer coefficients were determined under pressures from 1~11 tmospheres (abs.)

heat load from 5000~47000 kcal/m2:hr

and boiling temperatures from 356~ 24℃. For mercury

we obtained the following relation

- Similar results were obtained for amalgams. Experiments were carried out under N2 atmospheres.