论文部分内容阅读
固-液相变过程具有等温或近似等温、相变潜热较大和相变前后材料体积变化较小的特点.相变材料与热（冷）表面接触,发生融化（凝固）,可明显强化表面换热.以一维相变平板在第一类边界条件下的导热为例,从有内热源的稳态导热与固-液相变传热的相似性出发,揭示了固-液相变强化传热的物理机制,提出了分别以稳态和瞬态传热速率为参照的相变传热表面换热强化度的概念,并推导出相应解析表达式,讨论了相变过程中影响强化换热的因素及其影响效果.
Solid-liquid phase change has the characteristics of isothermal or nearly isothermal, large latent heat of phase transition and small volume change of material before and after phase change.The phase change material contacts with hot (cold) surface and melts (solidifies) The thermal conductivity of a one-dimensional phase-change plate under the first boundary conditions is taken as an example. Based on the similarity between the steady-state heat transfer with internal heat source and the solid-liquid phase transition heat transfer, The physical mechanism of heat transfer is put forward. The concept of heat transfer enhancement of phase transition heat transfer surface is put forward, which is respectively referred to as steady state and transient heat transfer rate. Corresponding analytical expressions are deduced and the effects of heat transfer enhancement Factors and their effects.