Graduate Thesis Or Dissertation
 

Natural convection from a horizontal cylinder parallel to a heated vertical wall

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  • Heat transfer measurements have been made from a long (L/D = 15) horizontal cylinder in water parallel to a heated vertical wall. The cylinder and wall boundary conditions were isothermal, and they were maintained at equal temperatures. The investigation covered Rayleigh numbers based on cylinder diameter from 400,000 to 10,000,000. The cylinder height above the wall leading edge was set at height to diameter ratios, H/D, of 2.07, 7.44, and 15.50. The horizontal space between the cylinder and wall spanned the range 0.05 < S/D < 0.62. It was found that heat transfer was degraded as much as 46% for close spacings and enhanced as much as 15% at moderate spacings. The lowest position (H/D = 2.07) showed the greatest overall enhancement, while the highest position (H/D = 15.5) showed overall degradation.
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