冰箱蒸发器化霜试验研究及数值模拟OA

To quantitatively elucidate the influence of frost-layer physical properties on heat transfer and phase-change characteristics during defrosting of refrigerator evaporators,the research group constructed a combined experimental observation and numerical simulation approach to investigate experimental studies and systematic numerical simulation analyses on the melting behavior under different frost thickness and density conditions.In the experiments,frost layers with various physical properties were generated by controlling frosting conditions,and the melting process and temperature responses during defrosting were measured.In the numerical simulation,a frost-melting model was established based on the enthalpy-porosity method,and transient calculations were performed for the defrosting process,which were used to analyze the effects of frost parameter variations on melting dynamics.The results show that when the initial frost thickness increase from 1.000 mm to 3.000 mm,the complete melting time prolongs from 74 s to 108 s,representing an increase of approximately 45%.When the frost density increases from 150 kg/m3 to 450 kg/m3,the melting time extends from 93 s to 176 s,corresponding to an increase of 89%,indicating that frost density variations have a significantly stronger impact on the latent heat load during defrosting than frost-layer thickness variations.Quantitative relationships between frost physical properties,melting duration,and heating rate are established,providing a reference for defrosting strategy optimization and energy-efficient operation of evaporators.