Modelling Point and non Point Source of Nitrate with SWAT in the Jajrood River Watershed

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Jamshidi, Mahdi | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39453 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Tajrishy, Masoud
Abstract:
To investigate boiling heat transfer characteristics of nanofluids, transient quenching¬ experiments of a high temperature silver sphere in water-based nanofluids with Ag and TiO2 nanoparticles were performed. A silver sphere of 10 mm in diameter at the initial temperature of 700o C was quenched in the nanofluids at the temperature of 90o C. The results showed considerable reduction in the quenching ability of nanofluids compared to that of pure water. The presence of nanoparticles in water caused film boiling mode to vanish at lower temperatures depending on the mixture concentration. Computed heat transfer rates in nanofluids were lower than those in pure water. In the quenching experiments with an unwashed heated sphere, the film boiling mode did not appear and the hot sphere quenched more rapidly through nucleate boiling. In this case the sphere surface was covered by a thin layer of nanoparticles. It was evident that nanoparticles deposition on the sphere surface prevented vapor film from forming around it and resulted in quick quenching of the hot sphere
Keywords:
SWAT Software ; Watershed-Based Modeling ; Nitrate Transfer ; Jajrood Rivier ; Latian Dam

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