Passive heat transfer enhancement of laminar mixed convection flow in a vertical dimpled tube

2021 ◽  
Vol 28 (11) ◽  
pp. 3477-3490
Author(s):  
M. Toofani Shahraki ◽  
A. Lavajoo ◽  
A. Behzadmehr
Keyword(s):  
Heat Transfer ◽  
Mixed Convection ◽  
Heat Transfer Enhancement ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Transfer Enhancement ◽  
Laminar Mixed Convection

Fully HOC Scheme for Mixed Convection Flow in a Lid-Driven Cavity Filled with a Nanofluid

2013 ◽  
Vol 5 (1) ◽  
pp. 55-77 ◽  
Author(s):  
Dingfang Li ◽  
Xiaofeng Wang ◽  
Hui Feng
Keyword(s):  
Heat Transfer ◽  
Finite Difference ◽  
Mixed Convection ◽  
Solution Procedure ◽  
Higher Order ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Square Enclosure ◽  
Compact Finite Difference Method ◽  
Laminar Mixed Convection

AbstractA fully higher-order compact (HOC) finite difference scheme on the 9-point two-dimensional (2D) stencil is formulated for solving the steady-state laminar mixed convection flow in a lid-driven inclined square enclosure filled with water-Al2O3 nanofluid. Two cases are considered depending on the direction of temperature gradient imposed (Case I, top and bottom; Case II, left and right). The developed equations are given in terms of the stream function-vorticity formulation and are non-dimensionalized and then solved numerically by a fourth-order accurate compact finite difference method. Unlike other compact solution procedure in literature for this physical configuration, the present method is fully compact and fully higher-order accurate. The fluid flow, heat transfer and heat transport characteristics were illustrated by streamlines, isotherms and averaged Nusselt number. Comparisons with previously published work are performed and found to be in excellent agreement. A parametric study is conducted and a set of graphical results is presented and discussed to elucidate that significant heat transfer enhancement can be obtained due to the presence of nanoparticles and that this is accentuated by inclination of the enclosure at moderate and large Richardson numbers.

scholarly journals A numerical study of mixed convection in a square cavity with a heat conducting square cylinder at different locations

1970 ◽  
Vol 39 (2) ◽  
pp. 78-85 ◽  
Author(s):  
Md Mustafizur Rahman ◽  
MA Alim ◽  
Sumon Saha ◽  
MK Chowdhury
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Mixed Convection ◽  
Numerical Study ◽  
Convection Flow ◽  
Heat Conducting ◽  
Mixed Convection Flow ◽  
Square Cylinder ◽  
Weighted Residuals ◽  
Laminar Mixed Convection

Numerical simulations are carried out for mixed convection flow in a vented cavity with a heat conducting horizontal square cylinder. A two-dimensional solution for steady laminar mixed convection flow is obtained by using the finite element scheme based on the Galerkin method of weighted residuals for different Richardson numbers varying over the range of 0.0 to 5.0. The study goes further to investigate the effect of the inner cylinder position on the fluid flow and heat transfer in the cavity. The location of the inner cylinder is changed horizontally and vertically along the centerline of the cavity. The effects of both Richardson numbers and cylinder locations on the streamlines, isotherms, average rate of heat transfer from the hot wall, the average temperature of the fluid inside the cavity and the temperature at the cylinder center inside the cavity are investigated. The results indicate that the flow field and temperature distributions inside the cavity are strongly dependent on the Richardson numbers and the position of the inner cylinder. Keywords: Finite element method, square cylinder, vented cavity, mixed convection. doi:10.3329/jme.v39i2.1850 Journal of Mechanical Engineering, Vol. ME39, No. 2, Dec. 2008 78-85

Sign in / Sign up

Export Citation Format

Share Document