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Three-dimensional flow structures of straight rough-bed channels with different aspect ratios
Published in Wim Uijttewaal, Mário J. Franca, Daniel Valero, Victor Chavarrias, Clàudia Ylla Arbós, Ralph Schielen, Alessandra Crosato, River Flow 2020, 2020
Table 1. Channel and hydraulic conditions, where Q = discharge; R = hydraulic radius; h = channel depth; b = channel width; b/h = aspect ratio; r = height of roughness element; h/r = relative depth on roughness height; ūmax = maximum value of the mean streamwise velocity; Umean = bulk velocity; U*(R) = friction velocity; Re = Reynolds number on the hydraulic radius and the bulk velocity; Fr = Froude number on the hydraulic radius and the bulk velocity; |svmax|= maximum size of the mean secondary flow velocity.
Numerical Simulations of Flow-Induced Deflections in MITR LEU Fuel Plate Due to Channel Size Disparity
Published in Nuclear Technology, 2023
Guanyi Wang, Cezary Bojanowski, Akshay Dave, David Jaluvka, Lin-Wen Hu, Erik Wilson
where Vc =critical velocity beyond which the plate could collapseE =Young’s modulus of the plate materiala =plate thicknessh =channel gap thicknessρ =coolant densityb =channel widthυ =Poisson’s ratio of the plate material.
Isotopic effects of the N(2D) + H2 → NH + H reaction: a quantum time-dependent wave packet investigation
Published in Molecular Physics, 2020
N(2D) + D2 reaction’s values are in general agreement with the experimental data at the collision energy below 0.15 eV. The deviations from the experiment at the threshold may indicate that the PES reported by Li et al. [17] underestimate the barrier height. When the collision energy is above 0.15 eV, large discrepancies are observed between theoretical and experimental data. The experiment is based on the detection of D atom form, as suggested by Liu [10], N(2D) + D2 reaction is dominated at the collision energy below 4 kcal/mol (0.17 eV), whereas, OH + D2 reaction also generates D atom at the collision energy above 4 kcal/mol. This can explain why the theoretical values lower than the experimental data at collision energy above 0.15 eV. Thus, to achieve enhanced comparability, further theoretical and experimental studies are required. N(2D) + HD reaction’s ICSs of the two channels increase monotonically with the collision energy and ICSs of ND + H channel are larger than those of NH + D channel in the examined collision energy range.
The quantum and quasi-classical dynamics calculations of the Au++HD → AuH+/AuD++D/H reaction
Published in Molecular Physics, 2021
The reaction probabilities of the Au+ + HD reaction at several selected J values are displayed in Figure 4(a) (AuH+ + D channel) and Figure 4(b) (AuD+ + H channel), respectively. It is very clear that the threshold increases with the increasing J values due to the emerging of centrifugal barrier . Furthermore, we can also find that AuD+ + H channel has relatively large threshold than that of AuH+ + D channel for a fixed J value. It is because that AuD+ + H channel has a small reduced mass than that of AuH+ + D channel. In addition, more partial waves are needed to get convergent results at high collision energies.