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Effect of IVIass Transfer on the Performance of Selective Catalytic Reduction (SCR) SystemsThis paper presents a computational investigation of the effect of mass transfer on the performance of selective catalytic reduction (SCR) catalysts, which are employed to reduce NO^ emissions from diesel engines. The paper employs a single-channel based, onedimensiotial, isothermal model. The heterogeneous suiface chemistry is modeled by considering standard and fa.st SCR mechanisms, and the mass transfer rate is described by using a one-dimensional flltn model and dimensionless Sherwood (Sh) number. The paper investigates the effect of Sh numbers on the catalyst conversicm performance at various temperatures and space velocities. The re.iults show that the effect of the Sh number on the SCR catalyst performance is temperature dependent and is more pronounced at high space velocities. In general, higher Sh numbers lead to increased conversion efßciencie.s, [DOlIn this correlation, the dependence of Sh on the parameter (Re dIL) is more pronounced than that suggested by Hawthorns [12]. Journal of Engineering for Gas Turbines and Power

An automatic transmission shift method is presented, in which the torque transfer phase is controlled in closed loop. This is made possible by real-time estimation of the torque transmitted by the off-going and on-coming clutches participating in the shift. Each clutch torque is determined based on measured or estimated input and output shaft torques and accelerations. To illustrate an application of the method, traditional friction elements are used to emulate one-way-clutch function during a power-on upshift.

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