Abstract
This chapter discusses jet-flow in a heavy fluid and effect of surface tension. If all flows involving free surfaces were considered simply to be studies in the theory of jet-flow, then the theory of waves in a heavy fluid would be counted as a part of this theory. However, the theory of waves of a heavy fluid is usually regarded as a self-contained branch of hydro-mechanics, and it is natural to include in the theory of jet-flow only those flows of a heavy fluid in which waves on the free surface are absent. Moreover, only problems for which boundary conditions cannot be fully linearized are significant for the methods of the theory. For a heavy fluid, the continuity equation and boundary conditions will be the same as for a weightless one. Works have appeared in which approximate methods of solving problems involving a heavy fluid are given. Perhaps the main advantage of these methods over the exact ones lies in the fact that problems of practical interest can be successfully solved.
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