國立虎尾科技大學 |

Chemi-ionization and Nanoparticle Charging in Oxy-fuel flames.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Chemi-ionization and Nanoparticle Charging in Oxy-fuel flames./
作者:	Shah, Parth V.
面頁冊數:	1 online resource (146 pages)
附註:	Source: Dissertation Abstracts International, Volume: 76-11(E), Section: B.
Contained By:	Dissertation Abstracts International76-11B(E).
標題:	Aerospace engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9781321866742

Chemi-ionization and Nanoparticle Charging in Oxy-fuel flames.
Shah, Parth V.

Chemi-ionization and Nanoparticle Charging in Oxy-fuel flames. - 1 online resource (146 pages)

Source: Dissertation Abstracts International, Volume: 76-11(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

Charged species are formed in all combustion processes. Even though they are present in small amounts they offer wider range of applications including flame control and nanoparticle formation like soot. Hence, understanding the chemistry of charged species and their interaction with particles is of critical importance.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781321866742Subjects--Topical Terms:

686400
Aerospace engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Chemi-ionization and Nanoparticle Charging in Oxy-fuel flames.
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245 1 0 $a Chemi-ionization and Nanoparticle Charging in Oxy-fuel flames.
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300 $a 1 online resource (146 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 76-11(E), Section: B.
500 $a Adviser: Alexei Saveliev.
502 $a Thesis (Ph.D.) $c North Carolina State University $d 2015.
504 $a Includes bibliographical references
520 $a Charged species are formed in all combustion processes. Even though they are present in small amounts they offer wider range of applications including flame control and nanoparticle formation like soot. Hence, understanding the chemistry of charged species and their interaction with particles is of critical importance.
520 $a In the present study, charged species formed in a laminar counterflow diffusion flame of methane and oxygen enriched air are studied experimentally and numerically. An experimental method of measuring electron and total positive ion concentration is used. Electric current is measured as a function of the applied voltage, and volt-ampere characteristics are obtained at different points between the two nozzles of the counterflow burner at positive and negative potentials for different oxygen concentrations and different strain rates. The Langmuir probe theory is used to evaluate the spatial ion and electron concentrations from the volt-ampere curves. Mole fractions and concentrations of major individual charged species are predicted using a one-dimensional counterflow diffusion flame model. A 63 step chemi-ionization mechanism in addition to a 208 step methane-air combustion mechanism is used to model the chemical kinetics of the flame at different oxygen concentrations and strain rates. The effect of thermoionization of the neutral species is also analyzed.
520 $a With no external electric field nanoparticle charging is mainly governed by diffusion of charge carriers that are produced by chemi-ionization that electrostatically interact with particles. Another mechanism involves thermal ionization at high temperatures. A numerical model that describes the charging mechanism of a spherical nanoparticle in a methane-air counterflow laminar diffusion flame in oxy-fuel conditions is developed. The detailed kinetic model considers the production of ions and electrons in a methane-air flame due to chemi-ionization, thermal ionization and charging due to diffusion. The model is analyzed to study the effects of temperature, total nanoparticle concentration and chemi-ionization on nanoparticle charging and on ion and electron concentrations. The nanoparticle charging model is also extended to agglomerates by making changes to the model for the primary particles. The effect of charging for linear chain aggregates with fractal dimension of 1.0 is compared to that for fractal agglomerates with fractal dimension of 1.6. The nanoparticle model is validated by comparison with previous experimental results.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Aerospace engineering. $3 686400
650 4 $a Mechanical engineering. $3 557493
650 4 $a Chemical engineering. $3 555952
655 7 $a Electronic books. $2 local $3 554714
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690 $a 0542
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a North Carolina State University. $3 845424
773 0 $t Dissertation Abstracts International $g 76-11B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3710691 $z click for full text (PQDT)