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首页> 外文期刊>RSC Advances >Numerical investigation of the interaction between homogeneous and heterogeneous reactions of fuel-lean hydrogen-air mixtures over platinum in planar micro-channels
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Numerical investigation of the interaction between homogeneous and heterogeneous reactions of fuel-lean hydrogen-air mixtures over platinum in planar micro-channels

机译：平面微通道中贫燃料的氢气-空气混合物在铂上的均相和非均相反应之间相互作用的数值研究

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摘要

The interaction between homogeneous and heterogeneous reactions of a fuel-lean hydrogen-air mixture over platinum in a catalytic planar micro-channel was investigated numerically to assess the relative importance and respective contributions of homogeneous and heterogeneous reactions for different channel gap distances, inlet mass fluxes and equivalence ratios. Simulations were carried out with a two-dimensional computation that included detailed chemical kinetic mechanisms for the hetero-/homogeneous reaction. The results indicated that channel size can significantly affect the homogeneous reaction because of the effective radical and heat losses to the wall, despite the fact that the heterogeneous reaction remains basically unchanged. The catalytic wall helps in sustaining the homogeneous reaction in smaller channels by decreasing heat losses to the wall as a result of the exothermic heterogeneous reaction, while it also inhibits the homogeneous reaction because of wall radical quenching caused by typically higher absorption of OH radicals on the wall. Product species contribute even further to inhibiting homogeneous reaction because of the stronger diffusive mass flux in the smaller channel. In the present work, the main parameter effects on the interaction between homogeneous and heterogeneous reactions are explored. The limiting values of these parameters beyond which the homogeneous reaction becomes negligible as compared with the heterogeneous reaction are identified.
机译：数值研究了平面平面催化微通道中贫燃料的氢气-空气混合物在铂上的均相和非均相反应之间的相互作用，以评估相对重要性和均质和非均相反应对不同通道间隙距离，入口质量通量的贡献和当量比。使用二维计算进行了模拟，其中包括用于异质/均相反应的详细化学动力学机理。结果表明，尽管非均相反应基本上保持不变，但由于壁的有效自由基损失和热损失，通道尺寸会显着影响均相反应。催化壁通过减少由于放热非均相反应而导致的壁热损失，从而有助于在较小的通道中维持均相反应，同时由于壁自由基淬灭通常由较高的OH自由基吸收而导致壁自由基淬灭，因此它还抑制了均相反应。壁。由于在较小的通道中较强的扩散质量流量，产物种类甚至进一步抑制了均匀反应。在目前的工作中，主要参数对均相反应和非均相反应之间的相互作用有影响。确定了这些参数的极限值，超过该极限值，与非均相反应相比，均相反应变得可以忽略。

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