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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Fusion Science and Technology
Latest News
Remembering ANS member Gil Brown
Brown
The nuclear community is mourning the loss of Gilbert Brown, who passed away on July 11 at the age of 77 following a battle with cancer.
Brown, an American Nuclear Society Fellow and an ANS member for nearly 50 years, joined the faculty at Lowell Technological Institute—now the University of Massachusetts–Lowell—in 1973 and remained there for the rest of his career. He eventually became director of the UMass Lowell nuclear engineering program. After his retirement, he remained an emeritus professor at the university.
Sukesh Aghara, chair of the Nuclear Engineering Department Heads Organization, noted in an email to NEDHO members and others that “Gil was a relentless advocate for nuclear energy and a deeply respected member of our professional community. He was also a kind and generous friend—and one of the reasons I ended up at UMass Lowell. He served the university with great dedication. . . . Within NEDHO, Gil was a steady presence and served for many years as our treasurer. His contributions to nuclear engineering education and to this community will be dearly missed.”
Xiangyu Zhang, Zifeng Hou, Jie Mao, Wenqian Xu
Fusion Science and Technology | Volume 81 | Number 6 | August 2025 | Pages 604-621
Regular Research Article | doi.org/10.1080/15361055.2025.2470058
Articles are hosted by Taylor and Francis Online.
The instability of magnetohydrodynamic (MHD) duct flow is crucial in related industrial applications. The laminar flow in rectangular ducts at different Hartmann numbers (Ha = 100 to 1200) and wall conductance ratios (C = 0.001 to 5), as well as for two types of nonuniform conducting walls, has been numerically simulated and the instability trend analyzed using the energy gradient theory. The results show that the stability of Hunt’s case II at the core zone increases, the most unstable region appears near the parallel layer, and the stability near the parallel layer gradually weakens as the Ha increases at a constant Reynolds number and wall conductance ratio.
Similarly, the most unstable belt gradually transfers from the Hartmann layer to near the parallel layers as the wall conductance ratio increases at constant Reynolds number and Ha. The trend of the K value demonstrates an initial decrease followed by an increase, indicating that an increase in the wall conductance ratio initially enhances stability before leading to instability.
In the simulation of two types of nonuniform conducting ducts, it was found that the most unstable region in the duct occurred near the Hartmann layer attached to the insulating wall surface, with the Kmax value significantly higher than those of the insulating and uniform conducting ducts. This indicates that the flow in the nonuniform conducting ducts is the most unstable at the same Reynolds number and Ha. This study provides a reference for understanding the internal flow characteristics and stability of MHD flow in conducting ducts.
