  In this study we characterise the properties of foams used for varicose vein
sclerotherapy. Their effectiveness is evaluated by predicting their yield
stress and their flow profiles within a model of a vein. This information is
represented using a Bingham number, which also takes into account the foam
liquid fraction and the Sauter mean of the bubble size distribution. Based on
this modelling, the most effective foams have a Bingham number B = 600 for a
vein of diameter 2mm, in addition to a narrow bubble size distribution.
