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승화 지배적 착상 현상을 모사할 수 있는 착상 해석 모델
이재환(Jaehwan Lee),정해준(Haijun Jeong),김강율(Gangyul Kim),이관수(Kwan-Soo Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
When the frost layer grows under the extra-low cooling surface temperature, the phase change appears as a desublimation rather than freezing after condensation. However, the previous frosting models were established under the conditions favorable for freezing after condensation. The purpose of this study is to propose the frosting model based on the commercial software (Ansys fluent). The proposed model can predicts the growth behavior of frost layer under the conditions favorable for desublimation. In the numerical model, new mass transfer rate which can consider the water penetration into the frost layer was developed. The model was validated by experimental results at a cooling surface temperature of -40°C or less, where desublimation occurs predominantly. The frosting model predicts the growth of frost thickness and density within the maximum error of 15%. Furthermore, the frost layer growth was visualized using the frosting model.