Figure 3.

The case of a rigid lower wall and a stress-free upper wall, Rb = 0 (no microorganisms): (a) Oscillatory and non-oscillatory instability boundaries in the (Rac, Rn) plane. (b) Critical wavenumber in the (Rac, Rn) plane. (c) Square of the oscillation frequency, ω2, versus the nanoparticle concentration Rayleigh number (for oscillatory instability to occur, ω2 must be positive so that ω remains real).

Kuznetsov Nanoscale Research Letters 2011 6:100   doi:10.1186/1556-276X-6-100
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