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Division Spotlight
Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Latest News
Four million nuclear jobs by 2050: Who will do them?
Industry leaders from around the globe met this month to discuss the talent development that will be necessary for the long-term success of the nuclear industry.
The International Conference on Nuclear Knowledge Management and Human Resources Development, hosted by the International Atomic Energy Agency, was held in Vienna earlier this month. Discussed there was the agency’s forecast for nuclear capacity to more than double—or hopefully triple—by 2050 and the requirement of more than four million professionals to support the industry.
Shao-Rong Wu, Klaus Rehme
Nuclear Technology | Volume 89 | Number 1 | January 1990 | Pages 103-115
Technical Paper | Heat Transfer and Fluid Flow | doi.org/10.13182/NT90-A34362
Articles are hosted by Taylor and Francis Online.
Measurements of the mean velocity, wall shear stresses, and turbulent Reynolds stresses were performed in wall subchannels of two rod bundles. The rod bundle of four parallel rods was arranged symmetrically in a rectangular channel. The pitch-to-diameter ratio was 1.148, and the wall-to-diameter ratios were 1.045 and 1.074, respectively. The Reynolds numbers in these investigations were 6.11 × 104 and 7.07 × 104, respectively. The experimental results demonstrate once more that the structure of turbulence in rod bundles differs greatly from the structure in circular tubes. Especially in the narrow gaps between the rods and channel walls, there are increased levels of turbulence intensities in both the axial and azimuthal directions and, hence, of the kinetic energy of turbulence, caused by a strong turbulent momentum transport through the gaps. In comparison with the previous investigations in these geometries, however, arranged asymmetrically in the rectangular channels, the momentum transport between the subchannels across the gap between the rods is negligible. The comparison between the experimental wall shear stress distributions and those computed by the VELASCO code shows strong deviations, especially in the gap regions between the rods and channel walls. More sophisticated analytical tools than presently available are required to predict turbulent flow through rod bundles with sufficient accuracy.