A numerical study on unsteady natural convection of air with variable viscosity over an isothermal vertical cylinder

被引：13

作者：

Rani, Hari Ponnamma ^{[3
]}

Kim, Chang Nyung ^{[1
,2
]}

机构：

[1] Kyung Hee Univ, Dept Mech Engn, Coll Adv Technol, Seoul, South Korea

[2] Ind Liaison Res Inst, Kyung Hee, South Korea

[3] Natl Inst Technol, Dept Math & Humanities, Warangal, Andhra Pradesh, India

来源：

KOREAN JOURNAL OF CHEMICAL ENGINEERING | 2010年 / 27卷 / 03期

关键词：

Transient; Natural Convection; Vertical Cylinder; Variable Viscosity; Finite Difference Method; BOUNDARY-LAYER-FLOW; HEAT-TRANSFER; TEMPERATURE; SURFACE; FLUID;

D O I：

10.1007/s11814-010-0211-x

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The present study deals with the boundary layer flow and heat transfer of unsteady laminar free convection flow past a semi-infinite isothermal vertical cylinder immersed in air. The fluid viscosity is assumed to vary with the temperature. An implicit finite-difference method has been employed to solve the governing non-dimensional boundary layer equations. A parametric study is performed to illustrate the influence of variable viscosity on the velocity and temperature profiles. The numerical results reveal that the viscosity has significant influences on the transient velocity and temperature profiles, average skin-friction coefficient and the average heat transfer rate. The results indicate that as the viscosity parameter increases, the temperature and the skin-friction coefficient increase, while the velocity near the wall and the Nusselt number decrease.

引用

页码：759 / 765

页数：7

共 22 条

[1] Radiation effect on convective heat transfer in an electrically conducting fluid at a stretching surface with variable viscosity and uniform free stream [J].

Abo-Eldahab, EM ;

El Gendy, MS .

PHYSICA SCRIPTA, 2000, 62 (04) :321-325

[2]

Carnahan B, 1969, Applied numerical methods

[3]

Cengel Yunus A., 2014, Fluid Mechanics: fundamentals and applications, V3rd

[4] TRANSIENT NATURAL CONVECTION FROM THIN VERTICAL CYLINDERS [J].

DRING, RP ;

GEBHART, B .

JOURNAL OF HEAT TRANSFER, 1966, 88 (02) :246-&

[5] The effect of temperature-dependent viscosity on heat transfer over a continuous moving surface [J].

Elbashbeshy, EMA ;

Bazid, MAA .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2000, 33 (21) :2716-2721

[6]

FUJII T, 1970, INT J HEAT MASS TRAN, V13, P607, DOI 10.1016/0017-9310(70)90155-9

[7] Transient natural convection along vertical cylinder with heat and mass transfer [J].

Ganesan, P ;

Rani, HP .

HEAT AND MASS TRANSFER, 1998, 33 (5-6) :449-455

[8] THE EFFECTS OF SIGNIFICANT VISCOSITY VARIATION ON CONVECTIVE HEAT-TRANSPORT IN WATER-SATURATED POROUS-MEDIA [J].

GARY, J ;

KASSOY, DR ;

TADJERAN, H ;

ZEBIB, A .

JOURNAL OF FLUID MECHANICS, 1982, 117 (APR) :233-249

[9]

Hossain A, 2001, INT J THERM SCI, V40, P366

[10]

Incropera FP., 2007, FUNDAMENTALS HEAT MA

← 1 2 3 →