کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
661263 1458157 2007 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Generalized stability theory of vapor film in subcooled film boiling on a sphere
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Generalized stability theory of vapor film in subcooled film boiling on a sphere
چکیده انگلیسی
The previously proposed stability theory of vapor film in subcooled film boiling on a sphere was generalized to take account of interaction between base flow and perturbed components. A disturbance of standing wave type was assumed to be superimposed on the base flows of surrounding liquid and vapor film. For the surrounding liquid, the wave equation was applied to the whole region including the boundary layer and the energy equation was solved analytically by introducing a simplifying assumption. For the vapor film, the basic equations were solved by an integral method. By use of compatibility conditions at the liquid-vapor interface, the solutions for the surrounding liquid and the vapor film were combined to yield an algebraic relation among the vapor film thickness, the order of disturbance and the complex amplification factor of disturbance. The numerical solutions of critical vapor film thickness at which the real part of complex amplification factor was equal to zero were obtained for the disturbances of the zeroth, first and second orders. The numerical results indicated that the vapor film was most unstable for the disturbance of the zeroth order (i.e., uniform disturbance). The calculated value of the critical vapor film thickness for the uniform disturbance compared well with the average vapor film thickness at the minimum-heat-flux point obtained from the immersion cooling experiments of spheres in water at high liquid subcoolings.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 50, Issues 17–18, August 2007, Pages 3390-3400
نویسندگان
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