کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1859074 1530574 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Non-linear instability of a thin film flowing down a cooled wavy thick wall of finite thermal conductivity
ترجمه فارسی عنوان
بی ثباتی غیر خطی یک فیلم نازک که یک دیواره ضخیم موجدار خنک را با هدایت حرارتی محدود هدایت می کند
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک و نجوم (عمومی)
چکیده انگلیسی


• The flow instability of the cooled thin film flow down a wavy wall is investigated.
• The thickness and thermal conductivity of the wall are taken into account.
• It is found that a negative Marangoni number can destabilize the free surface response to the wall deformations.
• The spatial resonance is more effective than cooling to stabilize the free surface time-dependent perturbations.

The flow of a thin film down a vertical cold thick wall with finite thermal conductivity is investigated under the lubrication approximation. It is shown that, despite the cooling from the wall, it is possible to find a new flow instability. That is, the free surface response to the wall deformation increases its amplitude with the negative Marangoni number. This amplitude growth is independent from the evolution of the time-dependent perturbations imposed on the free surface which, in contrast, are stabilized by cooling from the wall. However it is demonstrated that, even in this case, spatial resonance (see Dávalos-Orozco, 2007, 2008) is more effective to stabilize the time-dependent perturbations. From the results it is evident that these effects are possible only when the magnitudes of the thicknesses ratio and the thermal conductivities ratio are small.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters A - Volume 379, Issues 12–13, 5 June 2015, Pages 962–967
نویسندگان
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