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The paper analyzes systems of heat and mass transfer, with heat exchangers of flat surfaces, rectangular, with two liquid thermal agents. The liquids are viscous, slow, and the flows are laminar, type Hagen Poiseuille or Bingham. It is studied, theoretical and applied, a heat exchanger "in plates" used as a cooler (radiator) or a recover system, main thermal agent circulating in a closed system with recirculation, assisted by thermo-siphoning. Keywords— flow, heat, laminar, resistance

HEAT EXCHANGER BETWEEN NEWTONIAN VISCOUS FLUIDS, WITH FLAT SURFACES, WITHOUT PHASE CHANGE, IN LAMINAR FLOW REGIME