ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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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
2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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
New laws offer nuclear industry incentives for existing power plant uprates
This year, the U.S. nuclear industry received a much-needed economic boost that could help preserve operating nuclear power plants and incentivize upgrades that extend their lifespan and power output.
Signed into law in 2022, the Inflation Reduction Act offers production tax credits (PTCs) for existing nuclear power plants and either PTCs or investment tax credits (ITCs) for new carbon-free generation. These credits could make power uprates—increasing the maximum power level at which a commercial plant may operate—a much more appealing option for utilities.
Tomomi Uchiyama
Nuclear Science and Engineering | Volume 133 | Number 1 | September 1999 | Pages 92-105
Technical Note | doi.org/10.13182/NSE99-A2075
Articles are hosted by Taylor and Francis Online.
Air-water two-phase flows around a rectangular cylinder located in vertical upward flows are analyzed by an incompressible two-fluid model using the two-dimensional upstream finite element method proposed earlier. The Reynolds number, based on the cross-stream width of the cylinder and the free-stream velocity of the liquid phase, is 2.0 x 104, and the volumetric fraction of the gas phase upstream of the cylinder g0 ranges from 0 to 0.075. Three kinds of cylinders with the thickness-to-width ratios D/B of 0.5, 1, and 1.5 are employed. The calculated flows exhibit unsteady behavior with the von Kármán vortices shedding from the cylinder into the wake at every g0 value. The volumetric fraction of the gas phase is higher in the wake and achieves maximum value at the center of the vortices, where the pressure reaches its minimum value. The flow field and the vortex-shedding frequency are greatly affected not only by the g0 value but also by the D/B ratio.