【摘要】 为系统性研究倾角对相变储能器传热速率的影响,对定壁温边界下重力作用PCM熔化机理进行深入分析。基于热量输入方向与重力方向的夹角γ定义通用坐标,建立可视化实验与数学模型,对熔化时间、液化率、固液界面演化等进行研究。结果表明:随着夹角γ增大,熔化时间先大幅减小后轻微增加;当夹角γ为0°时,PCM熔化过程为纯导热且时间最长;当夹角γ为120°时,PCM熔化时间最短,相对纯导热工况,熔化时间缩短了89.52%;当夹角γ为90°时,熔化时间缩短了84.44%,同时也较易实现,可将其作为工程应用时的判断基准。更多还原

【Abstract】 To systematically investigate the influence of the inclination angle on the heat transfer rate of the latent heat storage unit,the mechanism of gravity affecting the melting under the constant wall temperature boundary was analyzed. A general coordinate was defined firstly based on the angle γ between the heat source input direction and gravity direction,and then the visual experiment device and mathematical model were established to study the melting time,liquid fraction,and the evolution of the solid-liquid interface. The results indicate that the melting time first greatly decreases and then slightly increases as the included angle γ increases. When the included angle γ is 0°,the heat transfer during melting is heat conduction,and the corresponding melting time is the longest. When the included angle γ is 120°,the melting time is reduced by 89. 52% relative to the pure heat conduction condition and is the shortest. When the angle γ is 90°,the melting time is reduced by 84. 44%,which can be used as a benchmark for engineering applications due to its ease of implementation.更多还原