An examination of the effects of compressibility, variable properties, and body forces on fully developed laminar flows has indicated several limitations on such streams.nIn the absence of a pressure gradient, but presence of a body force (e.g., gravity), an exact fully developed gas flow results. For a liquid this follows also for the case of a constant streamwise pressure gradient. These motions are exact in the sense of a Cruette flow. In the liquid case two solutions {not a new result) can occur for the same boundary conditions. An approximate analytic solution was found which agrees closely with machine calculations.
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