(1. 湖南大學(xué) 汽車(chē)車(chē)身先進(jìn)設(shè)計(jì)與制造國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410082；
2. 湖南大學(xué) 機(jī)械與運(yùn)載工程學(xué)院，長(zhǎng)沙 410082；
3. 湖南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410082)
摘 要: 在改進(jìn)Hamasaiid模型的基礎(chǔ)上提出了新的金屬型鑄造界面換熱系數(shù)峰值hmax預(yù)測(cè)模型，該模型引入表面張力參數(shù)，定量研究其對(duì)界面換熱的影響。采用A356鋁合金金屬型重力鑄造實(shí)驗(yàn)對(duì)模型進(jìn)行驗(yàn)證。結(jié)果表明：反求計(jì)算的hmax約為5944 W/(m2？K)，采用Hamasaiid模型計(jì)算的hmax約為7987 W/(m2？K)，誤差約為34%；新模型未考慮表面張力時(shí)計(jì)算的hmax約為6228 W/(m2？K)，誤差約為5%，考慮表面張力時(shí)計(jì)算的hmax約為5992 W/(m2？K)，誤差約為1%。新模型計(jì)算精度有較大提升，計(jì)算結(jié)果與反求結(jié)果具有很好的一致性，表面張力對(duì)計(jì)算精度有一定影響。
關(guān)鍵字: 界面換熱系數(shù)；金屬型重力鑄造；表面粗糙度參數(shù)；表面張力；接觸熱阻；反熱傳導(dǎo)法
（1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University,
Changsha 410082, China;
2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China;
3. College of Material Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:The new predictive model of metal casting interfacial heat transfer coefficient peak value (hmax) was proposed by improving Hamasaiid’s model. The surface tension was introduced into the model, its impact on the interfacial heat transfer was quantitatively studied. A356 aluminum alloy gravity die casting experiments were performed in order to validate the model. The results show that the hmax value calculated by the inverse heat conduction method is about 5944 W/(m2？K), the result of Hamasaiid’s model is about 7987 W/(m2？K), and the error is about 34%. The hmax value calculated by the new model is about 6228 W/(m2？K), and the error is about 5%, but if the surface tension is considered, the result is about 5992 W/(m2？K), and the error is about 1%. The calculation accuracy of the new model was greatly improved, the calculation results are in good agreement with the inverse results. The surface tension has a certain impact on the calculation accuracy.
Key words: interfacial heat transfer coefficient; metal mold gravity die casting; surface roughness parameters; surface tension; thermal contact resistance; inverse heat conduction method
