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.
Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
Fusion Science and Technology
Latest News
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Philippe J. Vernier, Philippe Solignac
Nuclear Technology | Volume 77 | Number 1 | April 1987 | Pages 82-91
Technical Paper | Heat Transfer and Fluid Flow | doi.org/10.13182/NT87-A33954
Articles are hosted by Taylor and Francis Online.
Our work was restricted to elementary models of condensation, coupling a laminar water film with an air-steam mixture boundary layer, under steady-state conditions, for some simple physical situations. We tested two categories of models. The models in the first category are merely the set of balance equations for which Sparrow’s numerical solutions have been replaced by Rose’s closed-form solutions. The models in the second category make use of correlations of mass transfer obtained by the Chilton-Colburn analogy and assumed closure laws concerning heat transfer across the film. The closed form of the solutions enabled us to propose numerical algorithms without integration, which we programmed in BASIC language. The differences we found between the results of the experiment and those of the models are systematic and positive, the calculated values being 50% less than the experimental results, on average. Comparing the abilities of the models, the situation of laminar-forced convection along a flat plate, whether the mixture is superheated or not, is the only situation where the model, using boundary layer theory, gives exact results. For the situation of turbulent free convection along a vertical wall, e.g., the containment wall of a pressurized water reactor system, the model, using the Chilton-Colburn analogy, gives only approximate results.