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This study reveals that injecting a light fluid of density ρb in the recirculating bubble of a bluff body at Re≈6.4×10⁴ has a greater drag reduction potential than blowing fluid of a density greater than or equal to that of the free stream ρ. It is found that the maximum drag reduction scales as (ρb/ρ)^-1/6. This power law combines the ability of the recirculating bubble to diffuse the injected momentum and the effectiveness of the injection to increase the recirculating bubble length.
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Lorite-Díez et al. (2020) studied this question.
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