Abstract
Current results in the study of laminar flame front structure are being obtained by gas sampling with fine quartz probes. Exclusive of questions of quenching, catalysis, aerodynamic disturbance etc., this technique has raised problems of the significance to be attached to samples withdrawn from regions of large concentration gradients. In the present paper a theoretical study is described in which the situation is approximated by a point sink located in a two-dimensional flow field containing a concentration gradient of a binary mixture. The appropriate diffusion equation is solved by the relaxation technique. The results indicate that the sample entering the sink has a composition which differs only very slightly from that existing at the same point in the unperturbed (no sink) case. A simple experiment is also reported which provides some support for this result, as well as proving conclusively that a probe does not withdraw a sample measuring the total flux (due to diffusion and convection) of each species through a cross section.
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