The great number of moving parts, the sliding friction, the reversal of direction at rapid intervals, and the mechanical shock involved all contribute to severe wear.

大量运动部件、滑动摩擦、极短时间内运动方向的变化以及机械冲击等都使摩损加剧。

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The order of slip boundary condition shows an apparent influence on the friction coefficient but only a slight influence on the Nusselt number if compressibility is ignored.

在不考虑可压缩性因素时，滑移边界条件的阶数对阻力系数的影响较大，对换热系数的影响不是十分明显。

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In high Reynolds number range of 10,000 ~ 90,000, the flow friction factor, local and average convection heat transfer coefficients were determined.

在10,000 ~ 90,000的高雷诺数范围内，测量了流动摩擦系数、局部和平均对流换热系数。

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The base 3.5-liter V6 engine receives a number of friction-reducing enhancements for 2012 and generates a lively 280 horsepower and 254 pound-feet of torque.

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But smoother increases in marginal tax rates, as under current law, create less economic friction, and fewer deadweight losses, then those with a number of peaks and valleys.

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