The numerical method is employed to investigate the influence of contaminated degree of bubble surface on its wakes for the spherical bubble under moderate Reynolds number (25 ≤ Re ≤ 500). By referencing the flow past a sphere and the stagnant cap model

one kind of three-dimensional model for contaminated spherical bubble under moderate Reynolds number is proposed. The interface contaminated degree is dependent on the magnitude of the cap angle. The larger the cap angel is

the slighter the bubble interface pollution is. The present results show that

for 25 ≤ Re ≤ 200

the magnitudes of the vortex length

the vortex center position distance to the bubble rear and the separation angle decrease with the decrease of the bubble surface contaminated degree but the distribution trends of those parameters against the Reynolds number are similar; for 250 ≤ Re ≤ 500

the decrease of the bubble surface contaminated degree weakens the three-dimensional property of vortexes

reduces the strength of orderly shedding vortexes until the shedding phenomenon disappears at Re=350

and reduces the disorder of shedding vortexes until the shedding phenomenon disappears too at Re=500.