科研之友
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摘要
The melting characteristics of aluminium ( Al) scrap were studied in a pilot-scale revolving liquid metal tank ( RLMT) which sits in a resistance furnace. Commercially pure Al of about 39 kg was melted in the RLMT. Experiments were carried out in a stagnant and in a revolving Al bath at different liquid metal temperatures and speeds. Cylindrical Al 6061 alloy samples were used in this experimental work. Their melting time inside the Al bath was recorded with a specially designed electrical circuit. Upon immersion of a cold cylindrical sample into liquid Al, a shell solidifies around the specimen and subsequently melts back. The time during which the shell exists around the cylinder is called shell period. The free melting period commences when the shell period ends. The thermal contact resistance ( TCR) at the Al shell/cylinder interface affects how long the shell lasts. A methodology was developed to estimate this TCR. The convective heat flux from the Al bath to the cylindrical specimen influences the shell and free melting periods, and is a function of liquid Al temperature and speed. The Part I of this research work presents a baseline of Al melting measurements under single phase flow conditions, that will be compared against two phase flow conditions in Part II of this research.
- 出版日期2016
