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Remembering Charles E. Till
Charles E. Till
Charles E. Till, an ANS member since 1963 and Fellow since 1987, passed away on March 22 at the age of 89. He earned bachelor’s and master’s degrees from the University of Saskatchewan and a Ph.D. in nuclear engineering from Imperial College, University of London. Till initially worked for the Civilian Atomic Power Department of the Canadian General Electric Company, where he was the physicist in charge of the startup of the first prototype CANDU reactor in Canada.
Till joined Argonne National Laboratory in 1963 in the Applied Physics Division, where he worked as an experimentalist in the Fast Critical Experiments program. He then moved to additional positions of increasing responsibility, becoming division director in 1973. Under his leadership, the Applied Physics Division established itself as one of the elite reactor physics organizations in the world. Both the experimental (critical experiments and nuclear data measurements) and nuclear analysis methods work were internationally recognized. Till led Argonne’s participation in the International Nuclear Fuel Cycle Evaluation (INFCE), and he was the lead U.S. delegate to INFCE Working Group 5, Fast Breeders.
Salman Alzahrani (Missouri S&T/KACST), Shoaib Usman (Missouri S&T)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 1189-1201
Twisted-tape is one of the most important members of passive heat transfer augmentation techniques for forced convection in many applications. In this paper, a numerical investigation of the heat transfer, pressure drop and secondary flow under the normal operating conditions of the NuScale SMR reactor for sub-channel with and without twisted tape geometry are performed. 3D models for twisted tapes on 2 x 2 rod bundle inside spacer grid fitted was developed. Subsequently, a twisted tapes on 2 x 2 along the entire sub-channel, that spacer grid and the gap between spaces were evaluated through the comparison with no twist tapes and with several twist ratios (p/d = 4.2, 1.7 and 0.85). The results have revealed a strong effect of twist ratios on pressure drop and secondary flow (SF) increases with decreasing twist ratio. Moreover, the Nusselt number (Nu) is increased with Reynolds number (Re) and there is a significant improvement in the Nusselt number when a twisted tape is inserted into the entire sub-channel under the same Reynolds number. For p/d=0.85, heat transfer (Nu) enhancement of 25% and 101% was observed for twisted tapes inside spacer grid and the entire sub-channel respectively. Results showed that the pressure drop with twisted tapes inside spacer grid and the entire sub-channel are influenced by variation of twisted ratio. The highest pressure drop is achieved for the twist ratio of p/d =0.85 which is the lowest twist ratio in this study. Pressure drop showed an almost linear dependence on the twist ratios. Likewise, the secondary flow is observed to be much more pronounced when the entire channel length contained the twisted tape. Interestingly, SF seems to be peaking at the exit point of the spacer grid where the twisted tape ends. SF seems along the entire sub-channel when the entire length contained the tape. The highest SF is achieved for the twisted ratio (p/d =0.85) which is the lowest twist ratio in this study by about SF=.0.16.