کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7053495 1457608 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical investigation of the evolution and breakup of an evaporating liquid film on a structured wall
ترجمه فارسی عنوان
بررسی عددی تکامل و شکافت یک فیلم مایع تبخیر بر روی دیوار ساختار یافته
کلمات کلیدی
جریان فیلم، تبخیر، دیوار ساختار نظریه طول موج
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
This paper examines the evolution and rupture of a thin liquid film evaporating on a structured wall and the concomitant heat and mass transport. The heat is supplied either from the side of the wall or from the hot ambient gas. An evolution equation for the film thickness is derived in the framework of the long-wave theory under the assumption that the film thickness is small compared to the length scale of film deformation. The resulting fourth order partial differential equation is solved numerically employing a finite difference scheme using a MATLAB code. The results show that, in the case of a hot wall, the film breakup may occur even in the absence of evaporation. The reason for this breakup is Marangoni convection driven by uneven temperature distribution at the liquid-gas interface due to the wall structure. With increasing evaporation rate the rupture time decreases and the position at which the rupture occurs is shifted towards the crests of the wall topography. Additionally, it is found that the wave length of the wall structure has a non-monotonous effect on rupture time. If the film is heated by the ambient gas, the liquid-gas interface tends to follow the wall topography shape.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 70, April 2018, Pages 104-113
نویسندگان
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