The differing physical properties of some heat transfer agents result in different conditions for steam generation [5], causing the convective heat transfer relations for boiling in porous media to differ from those for smooth heat transfer surfaces. Considering convective heat transfer during the growth of a vapor bubble in combination with the results reported in [5] according to the procedures described in [6] permit us to derive the convective heat transfer law we seek in general form: Figures 2 and 3 show the agreement of various experimental results with this relation, and also permit us to evaluate the arbitrary constant in equation (3). Thus, for water, acetone, ethanol, and freons 11 and 113, providing the convective heat transfer law has the form a~qj. For ammonia, this constant equals and the convective heat transfer law has the form a~q\
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