Free convection from a constant heat flux elliptic tube

被引：28

作者：

Elsayed, AO ^{[1
]}

Ibrahim, EZ ^{[1
]}

Elsayed, SA ^{[1
]}

机构：

[1] Zagazig Univ, Fac Engn, Dept Power Mech Engn, Zagazig, Egypt

来源：

ENERGY CONVERSION AND MANAGEMENT | 2003年 / 44卷 / 15期

关键词：

free convection; constant heat flux elliptic tube; convection of air around tube; effect of elliptic tube orientation;

D O I：

10.1016/S0196-8904(03)00002-5

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

An experimental investigation is presented on free convection of air around the outer surface of a constant heat flux elliptic tube. The local and average Nusselt number distribution is reported for different. values of Rayleigh number and different tube inclination angles. The test Rayleigh number, based on input heat flux, ranges from 1.1 x 10(7) to 8 x 10(7). Average Nusselt numbers are evaluated and correlated with Rayleigh number for the elliptic tube with vertical major axis. Comparison between the convection characteristics of isothermal and constant heat flux elliptic tubes has been presented. Also, the effect of elliptic tube orientation on the average Nusselt number is shown. It is found that a higher value of average Nusselt number is achieved when the major axis of the tube is vertical. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：2445 / 2453

页数：9

共 10 条

[1] FREE-CONVECTION FROM AN ELLIPTIC CYLINDER WITH MAJOR AXIS VERTICAL [J].

BADR, HM ;

SHAMSHER, K .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1993, 36 (14) :3593-3602

[2] Laminar natural convection from an elliptic tube with different orientations [J].

Badr, HM .

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 1997, 119 (04) :709-718

[3]

Bejan A., 1995, Convection Heat Transfer, V2nd

[4]

Chen YM, 1996, J CHIN INST CHEM ENG, V27, P353

[5] CORRELATING EQUATIONS FOR LAMINAR AND TURBULENT FREE CONVECTION FROM A HORIZONTAL CYLINDER [J].

CHURCHILL, SW ;

CHU, HHS .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1975, 18 (09) :1049-1053

[6] CALCULATION OF LAMINAR-FILM CONDENSATION IN ON INCLINED ELLIPTIC TUBES [J].

FIEG, GP ;

ROETZEL, W .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1994, 37 (04) :619-624

[7] NUMERICAL-SOLUTION TO THE NAVIER-STOKES EQUATIONS FOR LAMINAR NATURAL-CONVECTION ABOUT A HORIZONTAL ISOTHERMAL CIRCULAR-CYLINDER [J].

KUEHN, TH ;

GOLDSTEIN, RJ .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1980, 23 (07) :971-980

[8] Free and forced convection laminar film condensation on horizontal elliptical tubes [J].

Memory, SB ;

Adams, VH ;

Marto, PJ .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1997, 40 (14) :3395-3406

[9] LOCAL NONSIMILAR SOLUTIONS FOR NATURAL-CONVECTION ON A VERTICAL CYCLINDER [J].

MINKOWYCZ, WJ ;

SPARROW, EM .

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 1974, 96 (02) :178-183

[10] On the thermal interaction between an isothermal cylinder and its isothermal enclosure for cylinder Rayleigh numbers of order 104 [J].

Newport, DT ;

Dalton, TM ;

Davies, MRD ;

Whelan, M ;

Forno, C .

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 2001, 123 (06) :1052-1061

← 1 →