Effect of winglet shape on heat transfer from heated cylinder in cross flow
Other Title(s)
تأثير شكل مولد الدوامات على انتقال الحرارة من أسطوانة مسخنة
Joint Authors
Yusuf, Ahmad Hashim
Jalil, Jalal Muhammad
Abd Allah, Hasan Karim
Source
Journal of King Abdulaziz University : Engineering Sciences
Issue
Vol. 17, Issue 2 (31 Dec. 2006), pp.119-130, 12 p.
Publisher
King Abdulaziz University Scientific Publishing Center
Publication Date
2006-12-31
Country of Publication
Saudi Arabia
No. of Pages
12
Main Subjects
Topics
Abstract AR
أجريت دراسة عملية للجريان و انتقال الحرارة من أسطوانة مسخنة في وجود و عدم وجود مولد من الدوامات من نوع (winglet).
إن معرفة آلية توزيع معامل الضغط السكوني و رقم نسلت للجريان حول الأسطوانة بدون استخدام مولد الدوامات (winglet) يساعدنا على معرفة آلية الجريان باستخدام مولد الدوامات.
و كان الجريان مضطربا متكامل النمو لمدى من رقم ريولدز (0.72*104 ≤ Re ≤ 1.44*104).
تم استخدام أربعة أنواع من مولدات الدوامات بزوايا هجوم مختلفة (20, 26, 30) و مواقع مختلفة ((Xm/D=0, 0.17, Ym/D=0.57, 0.65, 0.72, 0.8), (0.3, 0.5)).
بينت النتائج أن هناك تأثيرا كبيرا للشكل على انتقال الحرارة و هبوط الضغط, و أن أفضل شكل لتحسين انتقال الحرارة هو (رباعي (النوع 3)) (trapezoidal (type 3)) كذلك فإن انتقال الحرارة يزداد بازدياد كل من رقم رينولدز و زاوية الهجوم و أن أفضل موقع لمولد الدوامات هو (Ym/D=0.65) (Xm/D=0.17).
أوضحت النتائج أن انتقال الحرارة يتحسن بنسبة (14%) عند استخدام مولد الدوامات بالمقارنة مع حالة الأسطوانة بدون استخدام مولد الدوامات كذلك فإن هبوط الضغط يزداد بشكل بسيط.
Abstract EN
Experimental investigation of the flow and heat transfer around a heated cylinder in cross flow with and without using winglets has been carried out.
Distribution of the static pressure coefficients and Nusselt number and knowledge of the flow processes around the cylinder without winglets enable as to form an idea of the mechanism and pattern of the flow around the cylinder with winglets.
The flow was in fully-developed turbulent flow with Reynolds number range 0.72*104≤Re≤1.44*104.
Four different shapes of winglets were used with different angles of attack (20, 26, 32) at different locations ((Xm/D=0, 0.17, 0.3, 0.5), (Ym/D=0.57, 0.65, 0.72, 0.8)).
The results show that there is an effect of winglet shapes on heat transfer and pressure drop, and a better shape is a (trapezoidal (type 3)).
For enhanced heat transfer from cylinder, heat transfer increases with increasing Reynolds number and angle of attack.
Also the results show that the optimum position of winglet for enhanced heat transfer is (Xm/D=0.17 and Ym/D=0.65).
The research shows that heat transfer is enhanced as high as (14%) when winglets are used when compared with the case of a cylinder without winglets.
There is also a slight increase in pressure drop.
American Psychological Association (APA)
Jalil, Jalal Muhammad& Abd Allah, Hasan Karim& Yusuf, Ahmad Hashim. 2006. Effect of winglet shape on heat transfer from heated cylinder in cross flow. Journal of King Abdulaziz University : Engineering Sciences،Vol. 17, no. 2, pp.119-130.
https://search.emarefa.net/detail/BIM-344270
Modern Language Association (MLA)
Jalil, Jalal Muhammad…[et al.]. Effect of winglet shape on heat transfer from heated cylinder in cross flow. Journal of King Abdulaziz University : Engineering Sciences Vol. 17, no. 2 (2006), pp.119-130.
https://search.emarefa.net/detail/BIM-344270
American Medical Association (AMA)
Jalil, Jalal Muhammad& Abd Allah, Hasan Karim& Yusuf, Ahmad Hashim. Effect of winglet shape on heat transfer from heated cylinder in cross flow. Journal of King Abdulaziz University : Engineering Sciences. 2006. Vol. 17, no. 2, pp.119-130.
https://search.emarefa.net/detail/BIM-344270
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 128-129
Record ID
BIM-344270