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ELECTROSTATIC EFFECTS OF CHARGED STEAM JETS

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ELECTROSTATIC EFFECTS OF CHARGED STEAM JETS ( electrostatic-effects-charged-steam-jets )

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Journal of Electrostatics, 23 (1989) 69-78 Elsevier Science Publishers B.V.. Amsterdam - Printed in The Netherlands ELECTROSTATICEFFECTS OF CHARGEDSTEAMJETS J. FINKE Department AA, Technical University of Magdeburg, PSF 124, Magdeburg, 3010, GOR SUMMARY The electrostatic a charged jet that distribution of the the electrical field strength in the vicinity of the jet. As a consequence of drop evaporation a discharging drift current is generated. Resulting electrostatic ignition hazards and adequate safety measures are examined in more detail in connection with the charged state of a jet. INTROOUCTION The free jet expansion of steam during operational processes and the accidental release of steam from plants is a frequent process in chemical and other industries. For a long time it has been known that wet steam expansion is partially connected with a high electrostatic charging, a fact to be considered in zones with flammable atmospheres and which causes technological interference (ref. 1). Results of Napier (ref. Z), Seifert et al. (ref. 3) and Jones et al. (ref. 4) show that some expansion processes of wet steam yield 69 charging of wet steam during an expansion process yields interacts with the environment. The generation and volume charge density in the stationary state determines a real ignition hazard if no safety measures are considered. cannot be transfered to other expansion processes with other useful conclusions can be drawn with reference to the charge discharges. The processes within the free jet and in its vicinity claim there- fore especial interest since the charge transfer and the field influence directly cause the generation of ignition sources and other interference. The charged particles dispersed in a gaseous media (air and steam) are an electrogasdynamic system that essentially consists of water ions and charged water droplets. When the impulse of the two-phase jet decreases and the drops evaporate near the jet contour depending on the air humidity, the charges flow to earth. Using some of the properties of a turbulent free jet, e.g. the velocity distribution and the characteristic jet geometry it is possible to These results parameters, so no accumulations and conclude in a half-empirical strength distribution. A difficult to reach since electric field, as in the case of the known OCHV corona problem. The essential processes in the electrogasdynamic two-phase system are not only relevant for way useful results regarding the charge and field satisfying theoretical solution to this problem is a strong coupling exists between charge movement and 0304-3886/89/$03.50 0 1989 Elsevier Science Publishers B.V.

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