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Groeneveld, Dionysius C.,Tavoularis, Stavros,Raogudla, Prassada,Yang, Sun-Kyu,Leung, Laurence K.H. Korean Nuclear Society 2008 Nuclear Engineering and Technology Vol.40 No.2
The present paper describes the preliminary compilation, assessment and examination of the supercritical heat transfer(SCHT) database. The availability and reliability of the SCHT data are discussed. Similarities in thermodynamic supercritical properties and SCHT behaviour of water, $CO_{2}$ and R-134a have been examined and some tentative conclusions are made. Finally, the future experimental and analytical program at the University of Ottawa is described.
Overview of methods to increase dryout power in CANDU fuel bundles
Groeneveld, D.C.,Leung, L.K.H.,Park, J.H. Elsevier 2015 Nuclear engineering and design Vol.287 No.-
<P><B>Abstract</B></P> <P>In CANDU reactors some degradation in the CCP (critical channel power, or power corresponding to the first occurrence of CHF in any fuel channel) will occur with time because of ageing effects such as pressure-tube diametral creep, increase in reactor inlet-header temperature, increased hydraulic resistance of feeders. To compensate for the ageing effects, various options for recovering the loss in CCP are described in this paper. They include: (i) increasing the bundle heated perimeter, (ii) optimizing the bundle configuration, (iii) optimizing core flow and flux distribution, (iv) reducing the bundle hydraulic resistance, (v) use of CHF-enhancing bundle appendages, (vi) more precise experimentation, and (vii) redefining CHF. The increase in CHF power has been quantified based on experiments on full-scale bundles and subchannel code predictions. The application of several of these CHF enhancement principles has been used in the development of the 43-rod CANFLEX bundle.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Small changes in bundle geometry can have noticeable effects on the bundle CHF. </LI> <LI> Rod spacing devices can results in increases of over 200% in CHF. </LI> <LI> CHF enhancement decays exponentially downstream from spacers. </LI> <LI> CHF-enhancing bundle appendages also increase the post-CHF heat transfer. </LI> </UL> </P>
Cuc, Ngo Thi Kim,Simianer, Henner,Groeneveld, Linn Fenna,Weigend, Steffen Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.2
In this study, mitochondrial DNA (mtDNA) sequence polymorphism was used to assess genetic diversity of nine Vietnamese local chicken breeds. In addition, two Chinese breeds kept in Vietnam were included in the analysis for comparison. A 455-bp fragment of the mtDNA D-loop region was sequenced in 222 chickens of these 11 breeds. As reference, a skeleton was constructed based on chicken mtDNA sequences taken from the Genbank. Haplotypes of the nine Vietnamese local and two Chinese breeds were aligned together with these sequences. The Vietnamese and Chinese breeds showed a high degree of variability. In total, 37 haplotypes were identified in the chicken breeds studied forming eight clades. Thereby, the majority of individuals of the two Chinese breeds grouped together in one clade which is assumed to have its roots in the Indian subcontinent. Although the Vietnamese chicken breeds were distributed across all eight clades, most of them clustered in three main clades. These results suggest that the Vietnamese domestic chickens have originated from multiple maternal lineages, presumably from Yunnan and adjacent areas in China, South and Southwest China and/or surrounding regions (i.e. Vietnam, Burma, Thailand, and India).
Gallagher, S.J.,Reuning, L.,Himmler, T.,Henderiks, J.,De Vleeschouwer, D.,Groeneveld, J.,Rastegar Lari, A.,Fulthorpe, C.S.,Bogus, K.,Renema, W.,McGregor, H.V.,Kominz, M.A.,Auer, G.,Baranwal, S.,Casta& Elsevier 2018 Quaternary science reviews Vol.200 No.-
<P><B>Abstract</B></P> <P>Marine ooids are iconic indicators of shallow seawater carbonate saturation state, and their formation has traditionally been ascribed to physicochemical processes. The Indo-Pacific stands out as a region devoid of oolites, particularly during the Quaternary: the “ooid enigma”. Here we present results from recent coring by the International Ocean Discovery Program (IODP Expedition 356) off west Australia that shows that ooid horizons are common in Pleistocene strata up to 730,000 years old. Extensive “ooid factories” were created due to the presence of long-lived tidally influenced flat–topped tropical platforms suitable for intermittent ooid accretion over hundreds to thousands of years during highstands and times of lower sea level. This work suggests marine ooids may actually be more common in Indo-Pacific than previously reported. Past global ocean alkalinity was elevated during Pleistocene glacial periods and continental climate was generally more arid in the Indo-Pacific region compared to interglacials and the Holocene. Therefore, increased aridity associated with higher alkalinity conditions during the glacials facilitated ooid precipitation on adjacent tropical carbonate platforms particularly offshore from arid Australia. This confluence of factors suggests that more “ooid factories” may be encountered by further coring Indo-Pacific regions with Pleistocene flat long-lived carbonate shelves. However, Indo-Pacific Quaternary ooid occurrences outside Australia are rare, suggesting that the Northwest Shelf may be a unique archive of this non-skeletal precipitate. Further investigations into the petrography and geochemistry of pre-Holocene ooid occurrences will provide insights into their origin and the relative role of biotic, physicochemical and other factors in their formation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Oolites are rare in the Indo-Pacific, particularly during the Quaternary: the “ooid enigma”. </LI> <LI> IODP Expedition 356 off west Australia cored common ooid horizons in strata up to 730,000 years old. </LI> <LI> Extensive “ooid factories” were deposited on tidally influenced flat–topped tropical platforms. </LI> <LI> Oolites were deposited during low and high sea levels in generally arid conditions. </LI> <LI> More “ooid factories” may be found by coring regions with flat long-lived carbonate shelves. </LI> </UL> </P>