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Evaluation of metal / mould interfacial heat transfer during solidification of aluminium-4.5% copper alloy castings cast in CO2-sand moulds
| Content Provider | Semantic Scholar |
|---|---|
| Author | Kulkarni, Suneelkumar N. Radhakrishna, Kollipara |
| Copyright Year | 2005 |
| Abstract | In this study, two methods were employed to measure the heat transfer coefficient h at the metal –mould interface during casting. The first method measured the size of the gap formed between the metal and mould during the casting process and estimated the value of h based on the gap size. The second method measured the temperature at certain locations of the metal and mould, and derived h at the gap by using a reverse method. A procedure is also developed to use temperature measurement data in order to obtain h as a function of casting temperature near the interference. This data is very useful for the mathematical modelling of solidification for casting. In the present study, the casting material is an Al–4.5% Cu alloy and the mould material is CO2 sand. The results of measurements show that h is not constant, but varies with time and temperature during casting. With the measurement of gap size, h is very large in the beginning and keeps dropping afterwards. As the gap is fully developed, h approaches a constant value between 130 and 40 W/(m·°C). By the inverse method, along with temperature measurement, the value of h increases in the beginning stage, reaches a peak value of approximately 710 W/(m·°C), and then drops rapidly approximately to the solidification temperature, and rises again until the end of solidification. After that, h keeps dropping until the end of casting. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.materialsscience.pwr.wroc.pl/bi/vol23no3/articles/ms_2005_009.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
