二维非稳态导热模型的数值研究

Numerical Study of Two Dimensional Unsteady Heat Conduction Model

利用Comsol模拟软件,进行网格划分后,首先建立二维模型,设置边界条件之后,模拟得到该模型的温度场和空气速度场随时间的变化。对某地板采暖房间的导热情况进行数值模拟,模型边界条件设为:左壁面和天花板均为绝热,房间宽高L均为3m,底板厚度L1为0.2m,地面有一恒定热流,右外壁面温度为0℃,空气初始温度为5℃。分析结果表明:随着时间推移,房间右壁面附近的温度明显升高,地板附近温度升高的速度也较快,绝热的天花板和左壁面部分空气温度变化缓慢,其次,相较于绝热面,外壁面附近空气流动速度明显较快。

In this paper,the COMSOL simulation software is used,after meshing,the two-dimensional model is established first,and then the temperature field and air velocity field of the model change with time after setting the boundary conditions.The heat conduction of a floor heating room is numerically simulated.The boundary conditions of the model are set as follows:the left wall and ceiling are insulated,the width and height of the room are 3 M,the thickness of the floor L1 is 0.2 m,there is a constant heat flow on the ground,the temperature of the right outer wall is 0℃,and the initial air temperature is 5℃.The results show that:with the passage of time,the temperature near the right wall of the room increases significantly,and the temperature near the floor increases rapidly.The air temperature changes slowly in the insulation ceiling and left wall.Secondly,compared with the adiabatic surface,the air flow velocity near the outer wall is obviously faster.