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Abstract

Two systems for the generation of controlled convection conditions in quenching baths for laboratory tests are presented that differ significantly in complexity of design. The cooling of cylindrical samples heated to temperatures considerably above the boiling point of the quenchant is determined from the effect of convection on the kinematics of wetting. It was found from experiments carried out using aqueous polymer solutions that in general surface active substances have a stabilising effect on film boiling. Using pure water and two concentrations of an aqueous polymer solution as sample fluids, it was also found that data obtained in a simplified convection system may satisfactorily reflect the influence of the intensity of convection on the cooling process. The cooling results to be expected in commercial quenching applications employing forced convection can be predicted from the experimentally ascertained influence of convection on the cooling performance of quenching baths.

MST/801

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Evaluation of apparatus for assessing effect of forced convection on quenching characteristics

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