Determine the thermal \(\delta_{\mathrm{T}}\) and mass \(\delta_{\mathrm{M}}\) boundary layer thicknesses for Example \(18-5\) at \(\mathrm{T}_{\text {avg }}=69.2^{\circ} \mathrm{C}\).

Example 18-5

Example 18-4

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Continue Example 18-4 for crystallization of naphthalene. Example 18-5 will probably be a good review of your heat transfer knowledge. For this example, we start with tc= 0.018 m thick and want to find the time to go to tc = 0.022 m thick. Operate with TC = 60C, and (Tmelt - Tc) = 10C. AT is large because the crystal layer is relatively thick. Assume the crystals are pure, XC,imp = XC,phenol = 0. Use average conditions at tc = 0.020 m.