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The Ostwald ripening phenomenon for gas bubbles in a liquid consists mainlyin gas transfer from smaller bubbles to larger bubbles. An experiment wascarried out in which the Ostwald ripening for air bubbles, in a liquid fluidwith some rheological parameters of the human blood, is reproduced. There ithas been measured time evolution of bubbles mean radius, number of bubbles andradius size distribution, where the initial bubbles radii normalizeddistribution behaves like a Tsallis ($q$-Weibull) distribution. One of the mainresults shows that, while the number of bubbles decreases in time the bubblesmean radius increases, therefore smaller bubbles disappear whereas the,potentially dangerous for the diver, larger bubbles grow up. Consequently, itis presumed that such a bubble broadening effect could contribute, evenminimally, to decompression illness: decompression sickness and arterial gasembolism. This conjecture is reinforced by the preliminary results of Ostwaldbroadening to RGBM (Reduced Gradient Bubble Model) decompression schedules fora closed circuit rebreather (CCR) dive to 420fsw (128m) with 21/79 Heliox gasmixture.

Ostwald ripening for air bubbles and decompression illness: phenomenological aspects in diving