THE ENERGY-CONVERSION AT THE FLOW OF FLUI DS

In streaming open-circuit systems, such as reactors or pipelines, and agitated closed-circuit systems, such as mixer-settlers or motor-drive n combustion chambers, the work or work output (the operating sequence ) is an important partial problem. Formulations, such as ''the work tr ansported into the individual system is converted irreversibly into th ermal energy'' are used (1). If the processes taking place are separat ed consequently in favour of the balance equations (2) in accumulators , transport and conversion processes, it will be possible to different iate the above statement more precisely: Then the first process, which exceeds with the flow system boundary, is the transport of mechanical (kinetic and/or pressure-volume) energy E(pV) by the force of pressur e F-p = A(p) p. The second process is the work transport, which is cau sed vertically to the flow, by the frictional force F-tau = A(tau) tau , which in general integrally considered does not occur. These work tr ansports are not interrelated with the entropy transport (or irreversi ble entropy conversion (production)) as is the case with heat transpor t. Only the third energy conversion process in volume, which transform s kinetic energy into thermal energy, creates entropy production. The essay explains these interrelations.