Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Determination of the Heat Transfer Rate and Friction Coefficient in Cross-Flow Forced Convection
Submission Author:
Leonardo Cavalheiro Martinez , PR
Co-Authors:
Fernanda Perazzolo Disconzi, JOSÉ VIRIATO COELHO VARGAS, Leonardo Cavalheiro Martinez
Presenter: Fernanda Perazzolo Disconzi
doi://10.26678/ABCM.COBEM2017.COB17-1194
Abstract
This study presents the determination of the heat transfer rate and friction coefficient in the two-dimensional cross-flow around circular tubes of a heat exchanger. For this, the governing equations and the boundary conditions of the mathematical model, based on the formulation of the Finite Element Method (FEM) for heat transfer, it had been solved through the FEAP (Finite Element Analysis Program) program. In this way, it was possible to obtain the numerical results of heat transfer rate per unit length of the tubes and the average friction coefficient of the flow. It was assumed laminar, incompressible and steady-state flow of the air between the tubes. The air properties were maintained constant during simulation based on the film temperature. For the computational domain was used structured mesh with two-dimensional and quadrilateral elements. The obtained numerical solution behavior was as expected. The numerical result of the heat transfer rate per unit length and the average friction coefficient, respectively, were 293.64 Wm-1 and 0.1045, agreeing with the result obtained through of an empirical correlation, presenting a deviation of 11.2%. Thus, it can be stated that FEAP is a suitable computational tool for the simulation of cross-flows that involves the convective heat transfer around tubes.
Keywords
Finite Element Method, Heat Transfer Rate, cross-flow, friction coefficient
