schlieren

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Related to Schlieren effect: Schlieren photography, Schlieren lines

schlieren

[′shlir·ən]
(optics)
In atmospheric optics, parcels or strata of air having densities sufficiently different from that of their surroundings so that they may be discerned by means of refraction anomalies in transmitted light.
(petrology)
Irregular streaks with shaded borders in some igneous rocks, representing the segregation of light and dark minerals or altered inclusions, elongated by flow.
References in periodicals archive ?
Previous spray related studies show largely different arrangements to capture the Schlieren effects, mostly based on experience, desired sensitivity and experimental conditions [22, 23, 29, 30].
Ensemble averaged images enhance the discernibility of the jet by utilizing the nominally identical fuel spray and the apparently random background Schlieren effects. This procedure comes at the cost of the capability to study turbulent structures and fluctuations.