Graduate Thesis Or Dissertation
 

Experimental investigation of natural convection from an array of uniformly heated horizontal cylinders to mercury

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  • An experimental investigation was conducted to better understand the heat transfer process with natural convection from an array of uniformly heated horizontal cylinders to mercury. Five assembly geometries were studied, these being the single horizontal cylinder, two cylinders with spacing ratios S/D = 2,3 and 4, (S represents the center-to-center spacing between cylinders of diameter, D ), and three cylinders with a single spacing ratio of S/D = 2. All cylinders were arranged in the same vertical plane. A scale analysis was employed to predict the relationship between the average Nusselt number and the Boussinesq number. In the case of the single cylinder good agreement was achieved between scale analysis and experimental results. The Nusselt number is a function of Boussinesq number only in the single cylinder case. These findings were extended to cases with two and three cylinders. Correlations of Nusselt number with different Boussinesq numbers, various ratios of spacing and diameters of cylinders have been established for these multiple cylinder cases.
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