Graduate Thesis Or Dissertation
 

Nucleate boiling in a vertical annular duct

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  • Nucleate boiling of water in a vertical annulus was studied. The test section was entirely of stainless steel construction and was formed by a length of stainless steel tubing with a stainless steel heater rod centered in it. Two test sections with length to diameter ratios of 18 and 33 were used. The purpose of this study was to determine the effect of the Reynolds number upon nucleate boiling. This was accomplished by varying the power to the test section heater from 100 - 1000 W for ten different values of the Reynolds number. The Reynolds number was varied from 32650 to 83800 for a length to diameter ratio of 18 and from 10160 to 46710 for a length to diameter ratio of 33. Log - log plots of the heat flux versus the heater wall superheat were constructed. The data which were in the nucleate boiling regime were fit to a commonly used exponential relationship. This equation relates the heat flux to the wall superheat raised to a power n. The value of n was observed to vary from 3.08 to 1.57 for a length to diameter ratio of 18 and 4.00 to 3.09 for a length to diameter ratio of 33. Finally, the experimental data were compared to two correlations, that of Chen and Gungor - Winterton. Both correlations were found to predict higher values for the heat flux than were experimentally obtained.
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