Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
CONSTRUCTAL THEORY APPLIED TO CONSTRUCTION OF FINS ARRANGEMENT MOUNTED IN A MICROCHANNEL SUBJECTED TO LAMINAR FORCED CONVECTIVE FLOWS
Submission Author:
Elizaldo dos Santos , RS , Brazil
Co-Authors:
Rafael San Martin Moreira, Liércio Isoldi, jeferson Avila Souza, Elizaldo dos Santos
Presenter: Elizaldo dos Santos
doi://10.26678/ABCM.ENCIT2020.CIT20-0029
Abstract
Present numerical work investigates the construction of an arrangement of heated square fins mounted in a two-dimensional microchannel subjected to forced convective, incompressible and laminar cooled flows. The purpose is to maximize the heat transfer rate between the heated fins and fresh flow. Constructal Theory is employed for construction of the fins arrangement from an elemental configuration. The construction is based on a function that uses fluid dynamic and thermal fields for definition of each new elemental fin placement in the occupation area of the channel. For all simulated cases, forced convective flows with Bejan and Prandtl numbers of BeL = 3.6 and Pr = 0.71 are investigated. The solution of conservation equations of mass, momentum and energy is performed with a numerical code based on the Finite Volume Method (FVM). The mounting of fins varied in the range 1 ≤ N ≤ 15. For the present conditions, results indicated that an intermediate configuration with N = 4 led to the highest heat transfer rate between fins and cooled flow in the channel. For N ≥ 6, the fluid dynamic and thermal streams are strongly suppressed leading to high pressure drop and poor thermal exchange in the microchannels.
Keywords
Numerical simulation, Geometrical Investigation, Constructal Theory, microchannels, Heat Exchangers
DOWNLOAD PDF VIEW PRESENTATION
