کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7056732 1458057 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical study of heat transfer deterioration of turbulent supercritical kerosene flow in heated circular tube
ترجمه فارسی عنوان
مطالعه عددی زدای انتقال حرارت جریان نفتی بحرانی متخلخل در لوله دایره ای گرم شده
کلمات کلیدی
نفت کربن فوق بحرانی، انتقال گرما همراه است جریان آشفته مطالعه عددی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Turbulent flow and convective heat transfer of supercritical kerosene flow in an axisymmetrically heated circular tube with a diameter of 2 mm and at a mass flow rate range of 0.0015-0.015 kg/s and a wall heat flux range of 0.15-2.0 MW/m2 are numerically studied using Reynolds averaged Navier-Stokes method with a two-layer turbulence model. The thermophysical and transport properties of kerosene are determined by a 10-species surrogate with the Extended Corresponding State method. Mesh dependency is first investigated and numerical results of fuel and wall temperatures are compared with experimental data for validations. The results show that flow properties such as velocity and Reynolds number increase significantly along the axial direction as the fuel temperature rises and kerosene undergoes the state transition from liquid to supercritical state. Deterioration of convective heat transfer is found to occur when the wall heat flux exceeds a critical value and at the same time, the wall temperature approaches the pseudo-critical temperature of kerosene. The present results show that deterioration of heat transfer are attributed to the development of turbulent properties in the near-wall region based on the results of turbulent kinetic energy and turbulence production term. The relation between the critical heat flux (qwc) for occurrence of heat transfer deterioration and the mass flux (G) is studied and a fitting formula of qwc and G is obtained.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 85, June 2015, Pages 1003-1011
نویسندگان
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