Experimental Validation of Heat Transfer Simulations for a Vertical Heated Rod Array within a Square-Cross-Section, Helium-Filled Isothermal Enclosure

[+] Author and Article Information
Dilesh Maharjan

University of Nevada Reno, 1664 North Virginia St MS 312, Reno, NV 89557

Mustafa Hadj-Nacer

University of Nevada Reno, 1664 North Virginia St MS 312, Reno, NV 89557

Narayana Rao Chalasani

Johns Manville, 10100 W Ute Ave., Littleton, CO80127

Miles Greiner

University of Nevada Reno, 1664 North Virginia St MS 312, Reno, NV 89557

1Corresponding author.

ASME doi:10.1115/1.4037493 History: Received November 29, 2016; Revised May 18, 2017


Measurements of heat transfer Computational fluid dynamics simulations from of an 8x8 array of vertical heater rods to the walls of within a square cross-section, helium-filled pressure vessel enclosure are performed for a range of enclosure temperatures, helium pressures and rod heat generation rates. This configuration is relevant to a used nuclear fuel assembly within a dry storage canister. The measurements are used to assess the accuracy of computational fluid dynamics/radiation the simulations, the temperature results are compared to measurements made in the same configuration. The simulations employ use the measured enclosure temperatures as boundary conditions, so they essentially calculate and predict the temperature difference between the rods and enclosure. These temperature differences are as large as 72°C for some experiments. The measured temperature of rods near the periphery of the array are sensitive highly dependent on to small, uncontrolled variations in their location. As a result, those temperatures are not as useful for validating the simulations as measurements from rods nearer the array center. The simulated rod temperatures exhibit random differences from the measurements that are as large as 5.7°C, but the systematic (average) error is 1°C or less. The random differences between the simulated and measured maximum array temperature is 2.1°C, which is less than 3% of the maximum rod-to-wall temperature difference.

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