Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
LAMINAR COFLOWING JETS FLAMES INSIDE TUBES WITH IRREGULAR WALLS
Submission Author:
Ricardo Soares , RJ
Co-Authors:
Rafael Leitão, Ricardo Soares, Albino Leiroz
Presenter: Ricardo Soares
doi://10.26678/ABCM.ENCIT2020.CIT20-0253
Abstract
Irregular surfaces are often present in a wide variety of heat transfer applications where equipment compactness is sought. The presence of irregularities or rough elements also disturbs the flow field near the solid surfaces changing the heat transfer rate. In the present study, axisymmetric confined reactive flows within cylindrical tubes with wall irregularities are analyzed. The reactive flow is described by the classical Shvab-Zeldovich formulation for unitary Lewis number. The mathematical model is based on mass, momentum, and mixture fraction conservation equations and considers the Burke-Schumann reaction mechanism and ideal gas behavior. Temperature dependence of the thermophysical properties is considered in the model. The Finite Volume Method is employed to discretize the governing equations, with a collocated grid arrangement. The SIMPLEC algorithm is employed to address the pressure-velocity coupling. A parametric study is conducted to evaluate the effects on the recirculation zones and the flame shape of the position and the size of the irregularities, of buoyancy and of the Reynolds number of the fluid flow. The shape and high of the flame are strongly affected by the changes in the wall irregularities as well as the recirculation zones besides the Reynolds number modifications drive changes in the flame behavior.
Keywords
Irregular Surface, Diffusion Flame, Flame Sheet Model, Finite Volume Method.
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