Open AccessComparison between one-dimensional uncoupled and convection-conduction conjugated approaches in finned surface heat transfer
Author(s) -
Cláudia Regina de Andrade,
Edson Luiz Zaparoli
Publication year - 2000
Publication title -
revista brasileira de ciências mecânicas
Language(s) - English
Resource type - Journals
ISSN - 0100-7386
DOI - 10.1590/s0100-73862000000400007
Subject(s) - thermal conduction , mechanics , heat transfer , work (physics) , thermodynamics , heat transfer coefficient , heat exchanger , convection , fin , convective heat transfer , materials science , forced convection , tube (container) , surface (topology) , concentric , momentum (technical analysis) , physics , mathematics , geometry , composite material , finance , economics
This work studies the forced convection problem in internal flow between concentric annular ducts, with radial fins at the internal tube surface. The finned surface heat transfer is analyzed by two different approaches. In the first one, it is assumed one-dimensional heat conduction along the internal tube wall and fins, with the convection heat transfer coefficient being a known parameter, determined by an uncoupled solution. In the other way, named conjugated approach, the mathematical model (continuity, momentum, energy and K-epsilon equations) applied to tube annuli problem was numerically solved using finite element technique in a coupled formulation. At first time, a comparison was made between results obtained for the conjugated problem and experimental data, showing good agreement. Then, the temperature profiles under these two approaches were compared to each other to analyze the validity of the one-dimensional classical formulation that has been utilized in the heat exchanger design