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Numerical Analysis of Coupled Heat and Mass Transfer Phenomena in Concrete at Elevated Temperatures

机译：高温下混凝土传热传质耦合的数值分析

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Based on well-established physical laws, a one-dimensional model that describes coupled heat and mass transfer phenomena in heated concrete has been developed. The mathematical model is based on the fully implicit finite difference scheme. The control volume approach was employed in the formulation of the finite difference equations. The primary variables considered in the analysis are temperature, vapor density, and pore pressure of the gaseous mixture. Several phenomena have been taken into account, such as evaporation, condensation, and dehydration processes. Temperature-, pressure-, and moisture content-dependent properties of both gaseous and solid phases were also considered. Numerical case studies that deal with extremely rapid heating of concrete are validated against experimental results with good agreement in spatial and temporal trends for temperature and pressure. Outputs from the numerical model demonstrated the influence of the coupling relationship between heat and mass transfer phenomena on temperature, vapor, and pressure distributions. Furthermore, it was noted that the temperature distribution trends are significantly affected by the vapor migration phenomenon; such an effect becomes more pronounced when moving deeper toward the concrete core.
机译：基于公认的物理定律，已开发了描述加热混凝土中传热和传质耦合现象的一维模型。数学模型基于完全隐式有限差分方案。有限差分方程的制定采用了控制体积法。分析中考虑的主要变量是气体混合物的温度，蒸气密度和孔隙压力。已经考虑了几种现象，例如蒸发，冷凝和脱水过程。还考虑了气相和固相的温度，压力和水分含量依赖性。根据实验结果验证了处理混凝土极快加热的数值案例研究，并且在温度和压力的时空趋势方面吻合良好。数值模型的输出证明了传热和传质现象之间的耦合关系对温度，蒸汽和压力分布的影响。此外，还注意到温度分布趋势受到蒸汽迁移现象的显着影响。当向混凝土芯深处移动时，这种效果会更加明显。

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