ADRIAAN ICLINKENBEPPG iV. V. De Batuafsche Petroleum Maatschappij (Royal D u t c h Shell Group), The Hague, HoEEamdT h e exact solutions of the equations describing t.i*mnsient heat and mass transfer phenomena in packed solids under given conditions can he approximated for all practical purposes by error functions. These may be read from a nomograph.
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