相变储热装置强化换热数值仿真研究

Numerical Simulation Study on Enhanced Heat Transfer of Phase Change Material Heat Sink

摘要:

针对相变材料导热性能差的问题,采用ANSYS FLUENT软件对内置矩形肋片强化换热的石蜡类相变储热板进行了数值仿真。在储热板外形尺寸和热流密度一定的条件下,通过改变矩形肋片的数量、高度和厚度,得到了不同肋片参数下储热板的表面温度分布、温差分布及石蜡液相率分布。数值仿真结果表明:矩形肋片在强化相变材料换热的过程中起到了重要的作用,其参数会影响换热效果;在储热板尺寸一定时,增加肋片的数量、厚度和高度均能降低储热板表面温度、温差和石蜡液相率,但存在最佳值。研究结果可为相变材料储热装置的结构优化设计提供依据。

Abstract:

Aiming at the problem of low thermal conductivity of phase change material (PCM), a numerical simulation was carried out by using ANSYS FLUENT software, in which the thermal performance characteristics of paraffin-type PCM-based heat sink enhanced by plate fins were studied. The effects of different geometrical parameters including number, thickness and height of plate fins were analyzed under the same external dimensions and the same heat flux of the PCM-based heat sink. Different aspects such as the base temperature, the temperature difference as well as the melting rate of paraffin were considered. Numerical simulation results show that plate fins play a crucial role in the process of the enhancement of heat transfer of PCM, in which geometrical parameters of plate fins can affect thermal performance characteristics. The increasing of plate fin number, fin thickness and fin height can lead to a signification decrease in the base temperature, the temperature difference as well as the melting rate of paraffin under the same external dimensions of the PCM-based heat sink. However, there is optimal value for each geometricalparameter.Theachievementprovidesareferenceforthegeometricalparameters optimizationdesignofPCM-basedheatsink