We present a theory for the vertical propagation of chemical waves near the onset of convection.Fluid motion, coupled to a standard reaction-diffusion mechanism for chemical wave propagation, determines the speed and shape of the reaction front in a two-dimensional slab. Our model is compared with experiments in capillary tubes. For tilted and horizontal tubes, fluid motion is always present with a corresponding increase in front speed. PACS number(s): 47.20. Bp, 47.70.Fw, 82.20.Mj
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