{"id":{"repo_id":"njit","oai_identifier":"oai:digitalcommons.njit.edu:theses-1487"},"canonical_url":"https://search.dev.ndltd.org/etd/njit/oai:digitalcommons.njit.edu:theses-1487","repository":{"repo_id":"njit","name":"NJIT","base_url":"https://digitalcommons.njit.edu/do/oai/"},"display":{"title":"Heat transfer model for the ignition of metal powder on a heated filament","abstract":"The thermal processes leading to ignition of metal powders in environments that experience rapid temperature changes are currently poorly understood. In this research, a methodology for studying and quantification of such processes is developed. In the experimental case study, the ignition temperature of Mg powder coated on the surface of an electrically heated filament is detected optically at different heating rates. To interpret the results, a heat transfer model has been developed for a multilayer powder coating on top of an electrically heated filament. The coating is modeled using a hexagonal close packed geometry and the heat transfer equations are derived for one dimensional heat flow. An Arrhenius type expression is used to describe the chemical reaction leading to ignition with the pre-exponent as an adjustable parameter. The contact resistance between each powder layer was derived using the bulk thermal properties of the powder. The thermal diffusivity of the powder was measured using the laser flash diffusivity technique for a powder sample freely loaded in a thin cylindrical cavity made in a heat insulator. The pre-exponent identified by matching the computations with the experimental data is 1 x 10^{10} kg/m^2s. For the Mg powder, it is concluded that the thermal processes leading to ignition, for a range of heating rates between 90 and 16,000 K/s, can be described by a single Arrhenius expression. In general, the developed methodology was validated can now be used for studying ignition of different reactive powders.","abstract_html":"The thermal processes leading to ignition of metal powders in environments that experience rapid temperature changes are currently poorly understood. In this research, a methodology for studying and quantification of such processes is developed. In the experimental case study, the ignition temperature of Mg powder coated on the surface of an electrically heated filament is detected optically at different heating rates. To interpret the results, a heat transfer model has been developed for a multilayer powder coating on top of an electrically heated filament. The coating is modeled using a hexagonal close packed geometry and the heat transfer equations are derived for one dimensional heat flow. An Arrhenius type expression is used to describe the chemical reaction leading to ignition with the pre-exponent as an adjustable parameter. The contact resistance between each powder layer was derived using the bulk thermal properties of the powder. The thermal diffusivity of the powder was measured using the laser flash diffusivity technique for a powder sample freely loaded in a thin cylindrical cavity made in a heat insulator. The pre-exponent identified by matching the computations with the experimental data is 1 x 10^{10} kg/m^2s. For the Mg powder, it is concluded that the thermal processes leading to ignition, for a range of heating rates between 90 and 16,000 K/s, can be described by a single Arrhenius expression. In general, the developed methodology was validated can now be used for studying ignition of different reactive powders.","abstract_has_math":false,"creators":["Ward, Trent Stanton"],"institution":null,"degree_name":"Master of Science in Mechanical Engineering - (M.S.)","degree_level":null,"degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Edward L. Dreyzin","Rajesh N. Dave","Mirko Schoenitz"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2005,"date_issued":"2005-01-01T08:00:00Z","date_published":"2005-01-01T08:00:00Z","updated_at":"2026-07-24T03:23:27Z","subjects":["Ignition","Metal powder","Mechanical Engineering"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.njit.edu/theses/488","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Edward L. Dreyzin","Rajesh N. Dave","Mirko Schoenitz"]},{"key":"dc:creator","label":"Author","values":["Ward, Trent Stanton"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science in Mechanical Engineering - (M.S.)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Ignition","Metal powder","Mechanical Engineering"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://digitalcommons.njit.edu/theses/488"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The thermal processes leading to ignition of metal powders in environments that experience rapid temperature changes are currently poorly understood. In this research, a methodology for studying and quantification of such processes is developed. In the experimental case study, the ignition temperature of Mg powder coated on the surface of an electrically heated filament is detected optically at different heating rates. To interpret the results, a heat transfer model has been developed for a multilayer powder coating on top of an electrically heated filament. The coating is modeled using a hexagonal close packed geometry and the heat transfer equations are derived for one dimensional heat flow. An Arrhenius type expression is used to describe the chemical reaction leading to ignition with the pre-exponent as an adjustable parameter. The contact resistance between each powder layer was derived using the bulk thermal properties of the powder. The thermal diffusivity of the powder was measured using the laser flash diffusivity technique for a powder sample freely loaded in a thin cylindrical cavity made in a heat insulator. The pre-exponent identified by matching the computations with the experimental data is 1 x 10^{10} kg/m^2s. For the Mg powder, it is concluded that the thermal processes leading to ignition, for a range of heating rates between 90 and 16,000 K/s, can be described by a single Arrhenius expression. In general, the developed methodology was validated can now be used for studying ignition of different reactive powders."]},{"key":"dc:title","label":"Title","values":["Heat transfer model for the ignition of metal powder on a heated filament"]}]}],"canonical_facts":{"dc:contributor":["Edward L. Dreyzin","Rajesh N. Dave","Mirko Schoenitz"],"dc:creator":["Ward, Trent Stanton"],"dc:description.abstract":["The thermal processes leading to ignition of metal powders in environments that experience rapid temperature changes are currently poorly understood. In this research, a methodology for studying and quantification of such processes is developed. In the experimental case study, the ignition temperature of Mg powder coated on the surface of an electrically heated filament is detected optically at different heating rates. To interpret the results, a heat transfer model has been developed for a multilayer powder coating on top of an electrically heated filament. The coating is modeled using a hexagonal close packed geometry and the heat transfer equations are derived for one dimensional heat flow. An Arrhenius type expression is used to describe the chemical reaction leading to ignition with the pre-exponent as an adjustable parameter. The contact resistance between each powder layer was derived using the bulk thermal properties of the powder. The thermal diffusivity of the powder was measured using the laser flash diffusivity technique for a powder sample freely loaded in a thin cylindrical cavity made in a heat insulator. The pre-exponent identified by matching the computations with the experimental data is 1 x 10^{10} kg/m^2s. For the Mg powder, it is concluded that the thermal processes leading to ignition, for a range of heating rates between 90 and 16,000 K/s, can be described by a single Arrhenius expression. In general, the developed methodology was validated can now be used for studying ignition of different reactive powders."],"dc:identifier":["https://digitalcommons.njit.edu/theses/488"],"dc:subject":["Ignition","Metal powder","Mechanical Engineering"],"dc:title":["Heat transfer model for the ignition of metal powder on a heated filament"],"dc:type":["Thesis"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_name":["Master of Science in Mechanical Engineering - (M.S.)"]},"updated_at":"2026-07-24T03:23:27Z"}