TY - JOUR
ID - 3562
TI - NUMERICAL STUDY OF MIXED CONVECTION IN THE ANNULUS BETWEEN ECCENTRIC ROTATING CYLINDERS
JO - Scientia Iranica
JA - SCI
LA - en
SN - 1026-3098
AU - Abedini, A.
AU - B. Rahimi, A.
AU - Kianifar, A.
AD -
AD - Faculty of Engineering, Ferdowsi Univ. of Mashhad, P.O. Box No. 91775-1111, Mashhad, Iran
AD - Faculty of Engineering, Ferdowsi Univ. of Mashhad, P.O. Box No.91775-1111, Mashhad, Iran
Y1 - 2014
PY - 2014
VL - 21
IS - 4
SP - 1403
EP - 1414
KW - mixed convection
KW - Bipolar- coordinate system
KW - annulus
KW - constant angular velocity
DO -
N2 - Mixed convection of air with Prandtl number of 0.7 in eccentric horizontal annuli with isothermal wall conditions was numerically investigated. The inner cylinder is at a higher temperature and the inner and outer cylinders rotate either clockwise or counter-clockwise at a constant angular velocity. The effects of parameters such as the eccentricity of the axes, the Rayleigh number and rotation direction were studied. The two-dimensional Navier-Stokes and energy equations were numerically solved in an orthogonal grid by employing a finite-volume method based on the SIMPLE algorithm. This orthogonality was achieved by employing a cylindrical bipolar coordinate system. Use of this coordinate system has the privileges of orthogonal coordinate and simplicity of computing different fluxes involved. Mean and local heat transfer results were obtained. The physics of the flow and the heat transfer is revealed by the streamlines and the isotherms obtained from the numerical solutions. Flow and heat transfer are influenced by the orientation and eccentricity of the inner cylinder. The present numerical results are in good agreement with the results of others for pure natural convection.
UR - http://scientiairanica.sharif.edu/article_3562.html
L1 - http://scientiairanica.sharif.edu/article_3562_d00eb31c6f78fd1cc75f4a164ed1c053.pdf
ER -