Mixed convection from a horizontal cylinder rotating in a cooling cross-stream

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

-The problem of mixed convection from a rotating horizontal isothermal cylinder placed in a cooling cross stream is considered. Heat transfer by convection is known to depend on Grashof number, Gr, Reynolds number, Re and the speed ratio, a. The study focuses on the effect of the ratio, Gr/Re², on the local and average heat transfer coefficients for selected values of Re and a while keeping Prandtl unchanged. The study is based on the solution of the unsteady Navier-Stokes and energy equations. The study covered the ranges of Re from 20 to 500, Gr from 0.0 to 10⁶ and from 0.0 to 8.0. Comparison with the previous theoretical results showed a good agreement where the differences did not exceed 1.0% while comparison with experimental correlations showed maximum percentage difference of 3.4%. The two terms Gr and were found to have a great influence on the local and average Nusselt numbers. Increasing Grashof number for constant speed ratio tended to increase the average Nusselt number, Nu, whereas increasing a for constant Gr and Re caused significant decrease in the average Nusselt number. On the other hand, high rotational speeds resulted in almost flat distributions of the local Nusselt number and consequently heat transfer rates. Isotherms, streamlines and equi-vorticity lines are plotted and different aspects of the phenomenon are discussed.

روابط وملفات

التعريف والنوع

رقم الوثيقة

0bc77269-1e7f-4d8f-82a9-2078af18407b

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

849850_1.pdf

بيانات النشر

ترجمة العنوان

انتقال الحرارة من اسطوانة دائرية أفقية في تيار هوائي منتظم يتدفع عموديا على محورها

ألقاب المؤلفين

[{"name_ar":" Hassan Badr ","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Ali Abdul-Aziz Mohammad Shehata ","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Mixed convection from a horizontal cylinder rotating in a cooling cross-stream

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

mixed convection, rotating cylinder, isothermal surface, cooling cross stream, Grashof number (Gr), Reynolds number (Re), speed ratio (a), Navier-Stokes equations, energy equation, Nusselt number, thermal stress, isotherms, streamlines, vorticity lines

إشراف وإعداد

الإشراف

Hassan Badr

الإعداد

Ali Abdul-Aziz Mohammad Shehata

الاقتباسات الببليوغرافية