The distinct slopes of tvisc and tR contour lines in Figure , particularly the larger negative slope of tvisc, indicate a dominance of tR at smaller Oh values and tvisc at larger Oh values. In instances where Oh is below a certain threshold, such as Oh < 0.1 (although not completely flat according to tvisc), the dominance of tR suggests that bubbles may be forming too rapidly but lack the stability for effective coalescence, resulting in the formation of small bubbles. Conversely, for cases above a certain threshold, such as Oh > 1.22 (although not completely flat according to tvisc), the dominance of tvisc implies that the fluid may already be too stable, hindering bubble formation.