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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Imprimer: 1093-3611
ISSN En ligne: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v8.i3.20
pages 339-351

CORRECTION FOR CALCULATION OF PARTICLE HEAT TRANSFER IN THERMAL PLASMAS

Sergey V. Dresvin
Laboratory of Electrotechnological and Plasma Installation of Polytechnic Institute -SPb State Polytechnical University, 29 Polytechnicheskaya Str., 195251 Saint-Petersburg, Russia
Jacques Amouroux
Laboratoire de Genie des Precedes Plasmas Universite P. et M. Curie, ENSCP 11 rue P. et M. Curie 75005 Paris France
S. G. Zverev
St. Petersburg State Polytechnic University, 29 Politekhnicheskaya Str., St. Petersburg, 195251, Russia
D. Ivanov
St. Petersburg State Polytechnic University, 29 Politekhnicheskaya Str., St. Petersburg, 195251, Russia

RÉSUMÉ

One of the most widespread areas of plasma technology is a treatment of fine-dispersed materials in plasma jets. Complexity of an experimental research of system "plasma flow - particles" has caused the creation of the mathematical models describing movement, heat transfer and physical and chemical transformations of dispersed materials in plasma. Researches of heat transfer in high-temperature flows are of significant interest as heat transfer from plasma to particles of powder is the determining factor.
A number of studies of particle heat transfer in thermal plasmas give the following expression for Nusselt number: Nu=2+A·Re0.5·Pr0.33, where A is constant. However, this expression overestimates Nu in comparison with experimental data. In this connection authors offer the criterial expression for calculation of particle heat transfer in plasma taking into account the correction for conductive term: Nu=2·(Vs/Vp)+A·Re0.5·Pr0.33. Introduction of correction namely Vs/Vp obviously explains mechanism of influence of heat transfer conductive component on particle conductive-convective heat transfer in thermal plasma and result in sufficiently good agreement of calculations with numerous experimental data.