科研之友
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摘要
Thermal conductivity, thermal dispersion, and structural effects in resin transfer molding (RTM) process are studied numerically. The injection part of the RTM process is modeled as a transport of resin flow through a fibrous porous medium in a long rectangular channel. The fluid flow is modeled using the Darcy-Brinkman-Forchheimer model and the heat transfer process using the energy equation based on local thermal equilibrium assumption. Both isotropic and anisotropic heat transfer in porous media are investigated. The governing equations are solved numerically for the isotropic heat transfer case and analytically for the anisotropic case. The numerical results are fitted to the available experimental data with at most 3% discrepancy, and the effective thermal conductivity of the fibrous porous medium is estimated. Taking into account the quadratic dependency of dispersion conductivity on Peclet number, the Chang model is recommended for the prediction of stagnant thermal conductivity as well as a correlation for dispersion conductivity. Finally, the effects of structural parameters on temperature distribution and velocity profiles are investigated.
- 出版日期2010
