RT Journal Article
T1 Global stability analysis of the natural convection between two horizontal concentric cylinders
A1 Serrano-Aguilera, Juan José
A1 Blanco-Rodríguez, Francisco José
A1 Parras-Anguita, Luis
K1 Calor -- Convección
K1 Energía térmica solar
AB In this investigation, the 2D flow between two horizontally positioned concentric cylinders (gravity per-pendicular to the axis of the cylinders), where the inner cylinder is kept at constant temperature Ti higherthan the outer border temperature To, is analyzed. Buoyancy forces initiate the movement of the fluid andthe generated flow is studied in a fixed geometry for values of Prandtl numbers (Pr) between 0.01 and 1,and Rayleigh numbers (Ra) between 102 and 5 · 106 . To solve the problem, a Chebyshev-Fourier spectralcode is developed in polar coordinates (r, θ ) respectively, and a complete map of steady-state solutionsis obtained where regions with multiple solutions are identified. Later, a global stability study of the ob-tained stationary solutions is carried out, providing a transition curve to unstable areas as a function ofthe control parameters of the problem (Pr, Ra). Finally, to check the stability results, temporal evolutionsimulations are accomplished for several cases where dual solutions are presented, finding intermediatealmost stationary solutions, and demonstrating that there exist typically single oscillating plume or dou-ble oscillating plume solutions (depending on the parameter space), where some of them have higherheat transfer coefficients, which may be interesting alternatives to improve heat exchange systems bymeans of passive control techniques.
PB Elsevier
YR 2021
FD 2021-06
LK https://hdl.handle.net/10630/23950
UL https://hdl.handle.net/10630/23950
LA eng
NO Serrano Aguilera, Juan José ; Blanco-Rodriguez, F.J. ; Parras-Anguita, Luis. Global stability analysis of the natural convection between two horizontal concentric cylinders. International Journal of Heat and Mass Transfer Volume 172, June 2021, 121151. https://doi.org/10.1016/j.ijheatmasstransfer.2021.121151
NO Funding for open access charge: Universidad de Málaga / CBUA. First author J.J. Serrano-Aguilera acknowledges the support provided by Ministerio de Ciencia, Innovación y Universidades (Spain) by means of the postdoc position: Ref No. FJCI-2017-32403 (Juan de la Cierva-Formación Postdoc Grant), as well as to Junta de Andalucía for the funding for the HERTERSOL project (UMA18-FEDERJA-195). Francisco J. Blanco-Rodríguez also acknowledgesfunding received from the Spanish Government program Juan de la Cierva-Incoporación through grant IJCI-2016-30126. Most of the numerical simulations have been carried out in Picasso, a RES node located in the Bio-Innovation Building of the University of Málaga (UMA) at the Technological Park of Andalusia (PTA).
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 26 ene 2026