In our discussion of dispersion, we mentioned it can also be applied for the heat transfer case. Comparing mass vs. thermal diffusivities, for what fluids might thermal dispersion be important? Is there an analogous thermal dispersion coefficient you can derive and what value might it take for engine oil at \(280 \mathrm{~K}\) flowing in a \(1 \mathrm{~mm}\) tube at a velocity of \(10 \mathrm{~cm} / \mathrm{s}\) ?