Zagazig University Digital Repository
Home
Thesis & Publications
All Contents
Publications
Thesis
Graduation Projects
Research Area
Research Area Reports
Search by Research Area
Universities Thesis
ACADEMIC Links
ACADEMIC RESEARCH
Zagazig University Authors
Africa Research Statistics
Google Scholar
Research Gate
Researcher ID
CrossRef
Experimental investigation of natural convection inside horizontal elliptic tube with different angles of attack
Faculty
Engineering
Year:
2006
Type of Publication:
Article
Pages:
35-45
Authors:
Ibrahim, E, Moawed, M, Emara, M, Elshazly, K
DOI:
10.1016/j.enconman.2005.03.019
Journal:
ENERGY CONVERSION AND MANAGEMENT PERGAMON-ELSEVIER SCIENCE LTD
Volume:
47
Research Area:
Thermodynamics; Energy \& Fuels; Mechanics; Physics
ISSN
ISI:000232410900003
Keywords :
natural convection, constant heat flux, horizontal elliptic tube, angle of attack
Abstract:
Natural convection from the inside surface of a horizontal elliptic tube of axis ratio (major to minor axis) 2:1 with a uniformly heated surface was investigated experimentally. The effect of angle of attack on the heat transfer rate was studied. The angle of attack (alpha) was varied from 0 (when the major axis was horizontal) to 90 (when the major axis was vertical) with steps of 15. The experiments covered a range of Rayleigh number Ra from 1.45 x 10(6) to 1.78 x 10(7). The local and average heat transfer coefficients and Nusselt number were estimated for different angles of attack at different Rayleigh numbers. The results obtained showed that the effect of angle of attack on the heat transfer coefficient is significant. The temperature distributions increase with the increase of axial distance from both ends of the tube until a maximum value at the middle of the tube. Also, the local Nu increases with the increase of a at the same axial distance. The average Nu(m), increases with the increase of alpha at the same Ra. The results obtained were correlated by dimensionless groups and with the available data of the horizontal elliptic tube. (c) 2005 Elsevier Ltd. All rights reserved.
Online
PDF
جامعة المنصورة
جامعة الاسكندرية
جامعة القاهرة
جامعة سوهاج
جامعة الفيوم
جامعة بنها
جامعة دمياط
جامعة بورسعيد
جامعة حلوان
جامعة السويس
شراقوة
جامعة المنيا
جامعة دمنهور
جامعة المنوفية
جامعة أسوان
جامعة جنوب الوادى
جامعة قناة السويس
جامعة عين شمس
جامعة أسيوط
جامعة كفر الشيخ
جامعة السادات
جامعة طنطا
جامعة بنى سويف