EFFECTIVENESS OF METALLIZED-GRAPHITE HEAT EXCHANGER | ||
| International Conference on Aerospace Sciences and Aviation Technology | ||
| Article 16, Volume 2, A.S.A.T. CONFERENCE 21-23 April 1987 , CAIRO, April 1987, Pages 269-280 PDF (2.5 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/asat.1987.26001 | ||
| Authors | ||
| S. M. EL_Dighidy1; M. A. Rabah2 | ||
| 1Associate Prof. Mech. Eng. Dept. Faculty of Engineering , Zagazig University , Zagazig , Egypt. | ||
| 2Associate Prof. Central Metallurgical Research and Develo-pment Institute , El Tebbin , Cairo Egypt. | ||
| Abstract | ||
| Oleum (98% concentrated is diluted with water for the production of superphosphate fertilizers. Cooling of the diluted acid is carried out in a heat exchanger made of gra-phite. Experimental models of heat exchangers simulating an industrial one were prepared from metallized graphite by imp-regnating synthetic graphite blocks with molten lead , copper and polytetraflouroethylene (PTFE). The effectiveness of these samples were investigated. Results obtained show that in a cross-flow heat exchanger , the effectiveness increases with the increase in the heat transfer surface area , the density of the graphite material and the flow velocity of the coolant. The properties of the imp-regnants such as the specific gravity , thermal conductivity mass up-take and chemical stability determine the feasibility of the impregnant. | ||
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