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distance distance of these two, conduction to the wall is more important, since convective heat removal dominates along the axis the greater the temperature gradient between the centre axis and the wall, the greater the rate of conduction

Fig. 18.2. Conductive heat transfer within aerated static beds. Note that conduction normal to the direction of air flow can be promoted by the presence of water jackets. It is important in thin beds but in wide beds its contribution to overall heat removal may be small. The graph on the upper right shows how conduction occurs down a temperature gradient. For the case where the temperature gradient is uniform, dT/dx = AT/Ax

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