  We present similarity solutions for mass-loaded adiabatic bubbles that are
blown by winds having time dependent mechanical luminosities. We consider
mass-loading through conductive evaporation of clumps. In the limit of little
mass loading a similarity solution found by Dyson (1973) for expansion into a
smooth ambient medium is recovered. We find that the Mach number in the shocked
mass-loaded wind shows a radial dependence that varies qualitatively from
solution to solution. In some cases it is everywhere less than unity in the
frame of the clumps being evaporated, while in others it is everywhere greater
than unity. In some solutions the mass-loaded shocked wind undergoes one or two
sonic transitions in the clump frame. Maximum possible values of the ratio of
evaporated mass to stellar wind mass are found as a consequence of the
evaporation rates dependence on temperature and the lowering of the temperature
by mass-loading. Mass-loading tends to reduce the emissivity in the interior of
the bubble relative to its limb, whilst simultaneously increasing the central
temperature relative to the limb temperature.
