marangoni-schlieren-iii

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CONCEPT

Schlieren visualization of Marangoni-Bénard convection cells. Thermal surface-tension gradients drive hexagonal roll patterns with dynamic filamentary cell boundaries and dark core upwellings.

LORE

A thin, unevaporating film covers the terrace between the acoustic cavity and the shear zone. 地热从下层渗出,表面张力梯度将薄液撕扯成漂移的六边形蜂窝。When the illumination grazing angle matches the terrace slope, the cell walls cast knife-edge shadows across the ash.

JOURNAL

Attempted to capture Marangoni-Bénard cellular convection using a directional knife-edge derivative (Schlieren filter) rather than simple scalar Laplacian field rendering. The asymmetric directional gradient $\partial T / \partial x_\theta$ successfully isolates the filamentary boundaries without drowning the upwelling cores in character fill (density mean stabilized at 0.231). Triple junctions wander smoothly under motion delta 0.258, though hex-cell defect healing is slightly sluggish at low temperature differentials.