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ALUMINUM AS A HIGH-TEMPERATURE HEAT-TRANSFER AGENT,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The work considers increasing power plant economy and reducing heat-exchanger size through the use of aluminum as the heat-transfer agent. The physical characteristics of aluminum are given and discussed. The advantages of impurities of certain metals in aluminum, the reactions of aluminum at high temperatures 720-1200 C, and the disadvantages of high chemical activity, are discussed and compared with the thermophysical properties of the alkali metals. The use of graphite as the structural material to be in contact with liquid aluminum is proposed for direct thermal-to-electric energy conversion and in atomic reactors. An experimental installation developed at the G. M. Krzhizhanovskiy Power Engineering Institute is described and evaluated. The thermophysical characteristics of A1 and using graphites as the structural material permit considering aluminum a prospective heat-transfer agent for application in solving a number of problems. The difficulties in the way of practical use of aluminum as a heat-transfer agent can be successfully surmounted. Heat exchange during motion of liquid aluminum in pipes can be calculated by equations that are correct for calculation of heat exchange of other liquid-metal heat-transfer agents. Author
APPROVED FOR PUBLIC RELEASE