Numerical Modelling of Coupled Heat and Mass Transfer in Porous Materials: Application to Cinder Block Bricks

In this work, we present numerical modelling of coupled heat and mass transfer within porous materials. Our study focuses on cinder block bricks generally used in building construction. The material is assumed to be placed in air. Moisture content and temperature have been chosen as the main transfer drivers and the equations governing these transfer drivers are based on the Luikov model. These equations are solved by an implicit finite difference scheme. A Fortran code associated with the Thomas algorithm was used to solve the equations. The results show that heat and mass transfer depend on the temperature of the air in contact with the material. As this air temperature rises, the temperature within the material increases, and more rapidly at the material surface. Also, thermal conductivity plays a very important role in the thermal conduction of building materials and influences heat and mass transfer in these materials. Materials with higher thermal conductivity diffuse more heat.

胶合木梁中温度与湿度应力研究

采用有限元模拟的方法,应用Luikov传热传质模型,对层板胶合木梁中因环境变化而产生的横纹湿热应力进行了计算分析。结果显示,在环境条件以天为周期变化的情况下,对梁的影响主要集中在梁的表面附近,尤以湿度应力更为显著。因温度变化而产生的横纹温度应力相对较小,在一定条件下可以忽略其影响,而湿度应力则已达到可能使构件表面开裂的应力水平,因此在设计中应对其给予足够的重视。