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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Influence of viscosity and impingement speed on intense hydrodynamic assist in curtain coating
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Influence of viscosity and impingement speed on intense hydrodynamic assist in curtain coating

机译：粘度和冲击速度对幕涂过程中强烈的水动力助剂的影响

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The onset of air entrainment for curtain coating onto a pre-wetted substrate was studied experimentally in similar parameter regimes to commercial coating [Re = rho Q/mu = O(1), We = rho Q u (c) /sigma = O(10), Ca = mu U/sigma = O(1)]. As with coating onto dry substrates, a large flow-rate dependence was observed; termed hydrodynamic assist. The influence of the impingement speed and viscosity are shown to be critical and three qualitatively different regimes of assist are identified. The interaction of the impinging curtain with the pre-existing film also led to a significant hysteretic effect throughout the flow rate-substrate speed parameter space.
机译：在与商业涂料相似的参数范围内，通过实验研究了幕帘涂料在预润湿的基材上夹带空气的开始[Re = rho Q / mu = O（1），We = rho Q u（c）/ sigma = O（ 10），Ca =μU / sigma = O（1）]。与在干燥的基材上进行涂层一样，观察到很大的流速依赖性。称为流体动力辅助。撞击速度和粘度的影响被证明是至关重要的，并且确定了三种定性上不同的辅助方案。撞击帘与预先存在的薄膜的相互作用还导致在整个流速-基底速度参数空间中产生明显的滞后效应。

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