Oscillatory Marangoni convection around the air bubble in a vertical surfactant stratification

The paper presents the experimental study of thermo- and solutocapillary Marangoni convection around a gas bubble in an inhomogeneous fluid with a vertical thermal or surfactant concentration gradient. The stationary bubble in the form of a short horizontal cylinder with a free lateral surface was placed into a vertically oriented thin liquid layer (Hele-Shaw cell). The evolution of thermal and concentration fields and fluid flows was studied applying the interferometric method. In contrast to a thermocapillary convection representing a stationary flow and stable temperature distribution, the periodic concentration disturbances around the bubble were observed in the solutocapillary case. The regularities of the discovered effect were revealed, and its interpretation was proposed.

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Marangoni convection induced by a nonlinear temperature-dependent surface tension

Journal de Physique ◽

10.1051/jphys:0198600470102300 ◽

1986 ◽

Vol 47 (1) ◽

pp. 23-29 ◽

Cited By ~ 7

Author(s):

A. Cloot ◽

G. Lebon

Keyword(s):

Surface Tension ◽

Marangoni Convection ◽

Temperature Dependent ◽

Nonlinear Temperature

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ASSESSMENT OF ANATOMICAL & FUNCTIONAL SUCCESS IN EXTERNAL DACRYOCYSTORHINOSTOMY BY AIR BUBBLE TEST

International Journal of Medical and Biomedical Studies ◽

10.32553/ijmbs.v3i9.535 ◽

2019 ◽

Vol 3 (9) ◽

Author(s):

Dr. Vikas Tantuway

Keyword(s):

Case Series ◽

Invasive Procedure ◽

Nasolacrimal Duct ◽

Good Tool ◽

Predictive Values ◽

Reliability Indices ◽

Air Bubble ◽

Bubble Test ◽

External Dacryocystorhinostomy ◽

Anatomical Success

Aim: To assess reliability indices of Air Bubble Test (ABT) for anatomical and functional success in external Dacryocystorhinostomy (DCR). Methods: Prospective case series of nasolacrimal duct obstruction underwent DCR. Functional success defined as Munk score 0 & 1 & anatomical success as free irrigation at followup.ABT performed by putting antibiotic drops into eye& asking patient to exhale while keeping nose & mouth closed. Formation of bubbles at punctum considered as positive test. Specificity, sensitivity, positive & negative predictive values calculated. Results: There were 103 DCR in 97 patients(23 male,74 female)with mean age 45.56 yr. Anatomical and functional success was 99.02% & 98.05%, respectively.ABT showed sensitivity 96.07%, specificity 100% for anatomical success after DCR. Sensitivity and specificity were 97.02% & 100% for functional success. Conclusion: As non-invasive procedure ABT is a good tool to assess success of DCR, though lacrimal syringing remains the gold standard. Keywords: Anatomical, Dacryocystorhinostomy & Air Bubble Test.

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