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convection flow effect on the surface and depth of the evaporative thin polymeric layers via piv method
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DOR
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20.1001.2.0021079099.1400.8.1.67.7
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نویسنده
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abbasian a.
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منبع
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كنگره بين المللي رنگ و پوشش - 1400 - دوره : 8 - کنگره بین المللی رنگ و پوشش - کد همایش: 00210-79099 - صفحه:1 -1
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چکیده
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Convection is the main reason for surface roughness in thin polymeric layers obtained by solvent evaporation. this phenomenon leads to the creation of a variety of surface patterns that are formed on the polystyrene/methyl ethyl ketone solution. in this research, the convection flow was observed and analyzed at the surface and depth of the polymeric fluids using particle image velocimetry method. the convection flow direction was seen to be similar in all cell patterns as ascending in the cell center and descending around it. two-dimensional flow direction in the cross section of each cell was found to be a counter-rotational flow. only one convective rotational flow was observed in the depth of the fluid in the thickness studied. the convection flow velocity in a cell was maximized in the central regions of the ascending flows in the depth of the fluid. there are irregular immobile zones between the cells, showing nearly no flow.
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کلیدواژه
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free convection ,polymeric solution ,temperature gradient ,concentration gradient ,convective patterns ,particle image velocimetry
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آدرس
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science & research branch of islamic azad university, department of polymer engineering, iran, science & research branch of islamic azad university, iran
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Convection flow effect on the surface and depth of the evaporative thin polymeric layers via PIV method
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Authors
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Abbasian A.
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Abstract
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Convection is the main reason for surface roughness in thin polymeric layers obtained by solvent evaporation. This phenomenon leads to the creation of a variety of surface patterns that are formed on the polystyrene/methyl ethyl ketone solution. In this research, the convection flow was observed and analyzed at the surface and depth of the polymeric fluids using Particle Image Velocimetry method. The convection flow direction was seen to be similar in all cell patterns as ascending in the cell center and descending around it. Two-dimensional flow direction in the cross section of each cell was found to be a counter-rotational flow. Only one convective rotational flow was observed in the depth of the fluid in the thickness studied. The convection flow velocity in a cell was maximized in the central regions of the ascending flows in the depth of the fluid. There are irregular immobile zones between the cells, showing nearly no flow.
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Keywords
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free convection ,polymeric solution ,temperature gradient ,concentration gradient ,convective patterns ,Particle Image Velocimetry
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