Abstract
Numerical modeling of the heat transfer and molecular mixing in an electrical furnace designed for the spectroscopic study of hydrogen/alkali-metal-vapor mixtures is described. The gases enter the furnace through three concentric tubes, the inner two of which contain the test gases while the outer contains a guard gas to protect the windows. The inner tubes terminate prior to the measurement section to allow the gases to mix. Heating is accomplished through contact with the wall of the outer tube. An implicit time-marching procedure including a preconditioning method is used to compute the coupled gas flows. The results show that optimum flow speeds occur at a Reynolds number of order ten. Higher speeds do not allow adequate heating or mixing and can become unsteady, while lower speeds allow considerable back diffusion in the concentric tubes.
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