ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Explore membership for yourself or for your organization.
Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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!
Latest Magazine Issues
Jul 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
August 2025
Nuclear Technology
Fusion Science and Technology
Latest News
ANS joins others in seeking to discuss SNF/HLW impasse
The American Nuclear Society joined seven other organizations to send a letter to Energy Secretary Christopher Wright on July 8, asking to meet with him to discuss “the restoration of a highly functioning program to meet DOE’s legal responsibility to manage and dispose of the nation’s commercial and legacy defense spent nuclear fuel (SNF) and high-level radioactive waste (HLW).”
Nailiang Zhuang (Univ of Michigan/Harbin Eng Univ), Kui Zhang (Univ of Michigan/Xi’an Jiao Tong Univ), Annalisa Manera, Victor Petrov (Univ of Michigan)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 250-262
Helical coil steam generators feature excellent heat transfer performance, compactness and mature manufacturing technology. In most designs, the two-phase mixture flows on the shell side of the heat exchanger, however in the steam generator design adopted in advance reactors such as the NUSCALE reactor design, the two-phase flow mixture flows in the helical coils of the heat exchanger. To improve the computational models used to predict the performance of such steam generators, it is necessary to characterize the behavior of two-phase flows in helical coils. In the present paper, detailed measurements of the void fraction distribution of an air-water two-phase flow in a glass transparent helical coil were conducted. At this aim, an X-ray radiography and high-speed videography system were used. The high-resolution measurements were also used to identify and classify flow regimes. A total of 15 runs is presented in this paper, classified into 6 flow regimes, namely: bubbly flow, plug flow, stratified wavy flow, slug flow, semi annular flow and annular flow.