Library

2562 match your search

A general approach for the design of cylindrical and prismatic spirally-wound lithium-ion cells that accounts for arbitrary tabbing and coating patterns is presented. Examples are presented for design of high-power and high-energy 18650 size cells. For highenergy cells the current collector design is not critical while for high-power cells the tabbing design is significant especially when thermal effects are considered.
Theslamming of breaking waves on the legs of large volumeoffshore platforms has received increased attention over recent years. Toinvestigate this problem, MARINTEK's Wave Impact Loads JIP has, inone of its sub-tasks, focused towards an idealised model testsetup of a rectangular cylinder in breaking waves. The modelconsists of a vertical column with a fragment of ahorizontal deck attached. The model is fixed at a distanceL ahead of the wave maker. Physical scale model testexperiments of the block in regular waves and in wavegroups have been carried out in Phase 1 of theJIP (2008). The...
Ithas been well-known that many industrial applications that use centrifugalcompressors have continuously demanded for more and more efficient machinesin the past decade or so. However, the current markettrend indicates that there is a strong demand among theend users for reduced delivery times of these efficient compressors.This, in turn, requires that the aerodynamic design of highlyefficient centrifugal stages be completed within shorter time frames. Inorder to meet these challenges, it is mandatory to involvemodern computational analysis tools such as Computational Fluid Dynamics (CFD)as...
Duringoffshore heavy lift or pipelay operations the station keeping capabilitiesof a DP-vessel have an important influence on operability limitsof these operations. Heerema Marine Contractors has two DP3-class semi-submersiblecrane vessels for these operations; the Thialf and Balder. Anassessment of the thrust efficiency of the DP thrusters ofthese vessels has been made by comparing CFD computations withdedicated model tests. A numerical study using CFD is performedto assess thruster-hull interaction on a semi-submersible vessel. The CFDresults are validated with a series of model tests,...
Accurate assessment of current loads on offshore vessels is required to determine operability of heavy lift and pipe lay operations. Whereas in the past only semi-empirical methods or model tests were suitable to obtain these data, CFD has recently become available as engineering tool to assess current loads on offshore structures. CFD has the potential to assess current loads more flexible in a numerical manner. Although the application of CFD has proven its value in assessment of ships resistance and VIV calculations, CFD is still not yet a fully proven method to calculate the current loads...
Most models of lithium-ion batteries follow the one-dimensional analysis approach. The major drawback of this is that the porosity and liquid-phase salt transport and solid-phase electronic conductivity are not explicitly resolved and the diffusion of lithium into and out of solid is modeled using representative spherical particles assuming perfect symmetry. These modeling assumptions limit the achievable accuracy; refinement of spatial computational grid and time steps cannot overcome the modeling error introduced by the above assumptions. Researchers at Battery Design LLC and CD-adapco set...

Pages