TY - JOUR
T1 - Numerical investigation of transient natural convection in a horizontal channel heated from the upper wall
AU - Andreozzi, Assunta
AU - Jaluria, Yogesh
AU - Manca, Oronzio
N1 - Funding Information:
Received 18 November 2005; accepted 13 October 2006. This research is funded by the Ministero dell’Istruzione, dell’Università e dell Ricera under a 2005
PY - 2007/1
Y1 - 2007/1
N2 - In this investigation a transient numerical analysis for laminar natural convection in air between two horizontal parallel plates, with the upper plate heated at uniform heat flux and the lower one adiabatic, is carried out by means of the finite-volume method. The model is assumed to be two-dimensional. The Navier-Stokes equations together with the continuity and energy equations are solved by a numerical scheme based on SIMPLE in an H-shaped domain. Results are presented in terms of air velocity and temperature profiles. Wall temperatures and the temporal behavior of several significant variables, such as the penetration length, are reported for different Rayleigh numbers and aspect ratio values. Correlations among penetration length, dimensionless time, Rayleigh number, and aspect ratio are evaluated for 102Ra104 and L/b=5, 10, and 20. At steady state regime, correlations for average Nusselt numbers and maximum dimensionless wall temperature in terms of Rayleigh number and aspect ratio are given for 102Ra104 and 5L/b20.
AB - In this investigation a transient numerical analysis for laminar natural convection in air between two horizontal parallel plates, with the upper plate heated at uniform heat flux and the lower one adiabatic, is carried out by means of the finite-volume method. The model is assumed to be two-dimensional. The Navier-Stokes equations together with the continuity and energy equations are solved by a numerical scheme based on SIMPLE in an H-shaped domain. Results are presented in terms of air velocity and temperature profiles. Wall temperatures and the temporal behavior of several significant variables, such as the penetration length, are reported for different Rayleigh numbers and aspect ratio values. Correlations among penetration length, dimensionless time, Rayleigh number, and aspect ratio are evaluated for 102Ra104 and L/b=5, 10, and 20. At steady state regime, correlations for average Nusselt numbers and maximum dimensionless wall temperature in terms of Rayleigh number and aspect ratio are given for 102Ra104 and 5L/b20.
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U2 - 10.1080/10407780601112720
DO - 10.1080/10407780601112720
M3 - Article
AN - SCOPUS:34247138881
SN - 1040-7782
VL - 51
SP - 815
EP - 842
JO - Numerical Heat Transfer; Part A: Applications
JF - Numerical Heat Transfer; Part A: Applications
IS - 9
ER -