Modelagem do aquecimento de fluidos com escoamento em tubos
AUTOR(ES)
Elvis Ronald Lopez Mercado
DATA DE PUBLICAÇÃO
2000
RESUMO
This study considers the modeling of laminar and turbulent flows with conjugated transference of heat in tubes of cylindrical section. Instead of using the convetional finite element or finite volume methods, this formulation applies a different technique discretizing the flow in the radial direction using a 4th order finite differences method. Using this technique, a system composed of several ordinary differential equations for the temperature and another composed of linear algebraic equations for the velocities are obtained. The equations are integrated in the axial direction using a 4th order Runge Kutta method. The values of viscosity, density, heat capacity and thermal conductivity are dependent on the temperature, which makes the model suitable for the calculation of high temperature gradients, as in the case of refinery fired heaters. The turbulence is taken into account using the "mixing lenght of Prandtl" as a zero order turbulence model. Since the pressure gradient is calculated in each point, the total pressure drop is obtained by integration through out the tube. A very interesting feature of this formulation is that for the study of laminar flow the method is non-iterative, which makes it more desirable and faster than conventional methods
ASSUNTO(S)
escoamento turbulento simulação (computadores) fluxo laminar tubos - dinamica dos fluidos calor - transmissão diferenças finitas
ACESSO AO ARTIGO
http://libdigi.unicamp.br/document/?code=vtls000197788Documentos Relacionados
- Modelagem em rede 3D do escoamento de fluidos particulados em meios porosos
- Escoamento em tubos de suspenções com comportamento não-newtoniano
- Análise do escoamento de convecção natural em tubos verticais concêntricos com propriedades variáveis
- Características dinâmicas do escoamento turbulento em bancos de tubos inclinados
- Modelagem do escoamento monofásico em bomba centrífuga submersa operando com fluidos viscosos