Commodo, Mario (2008) Diagnostic for the characterization of nanometric structures in high temperature reactive systems. [Tesi di dottorato] (Unpublished)

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Item Type: Tesi di dottorato
Language: English
Title: Diagnostic for the characterization of nanometric structures in high temperature reactive systems
Creators:
CreatorsEmail
Commodo, MarioUNSPECIFIED
Date: 2008
Date Type: Publication
Number of Pages: 122
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria chimica
PHD name: Ingegneria chimica
PHD cycle: 20
PHD Coordinator:
nameemail
Maffettone, Pier LucaUNSPECIFIED
Tutor:
nameemail
D'Alessio, AntonioUNSPECIFIED
Date: 2008
Number of Pages: 122
Uncontrolled Keywords: Nanoparticolato; Diagnostiche ottiche
MIUR S.S.D.: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/25 - Impianti chimici
Date Deposited: 21 May 2008
Last Modified: 30 Apr 2014 19:27
URI: http://www.fedoa.unina.it/id/eprint/1850

Abstract

It is now well know that the fraction of particulate mater in the ambient air defined as ultrafine particles can be considered the most critical for adverse human health effects because of their chemical composition and the ability of these particles to penetrate deeply into the respiratory tract. Moreover combustion has been recognised as the major source of harmful fine and ultrafine particles. The aim of the present thesis work is to investigate carbonaceous nanoparticles formation by combustion processes. An experimental procedure based on the use of the fifth harmonic of a Nd:YAG laser at 213 nm as exiting source and on an accurate signals acquisition has been realized. In-situ spectral optical measurements based on a combination of: Laser Induced Fluorescence (LIF), Laser Induced Incandescence (LII), Light Extinction (Kext) and Laser Light Scattering (Qvv) techniques have allowed to follow particles formation and their evolution directly in combustion environments with high spatial and temporal resolution. Laminar premixed and laminar and turbulent diffusion flames have been investigated burning ethylene, methane and benzene as fuels. Optical results are then compared with Particle Size Distribution Function (PSDF) obtained by Scanning Mobility Particles Sizer (SMPS) measurements in same flame conditions. An experimental investigation of the particulate emissions from commercial burners for home appliances fueled with natural gas has been also included. The experimental evidences, in according to literature in laminar premixed conditions, allow to conclude that two classes of nanoparticles are formed in flame:Nanoparticles of Organic Carbon (NOC) with sizes smaller than three nanometers and “primary” soot particles with sizes larger than ten nanometers that lead to the formation of soot aggregates. Moreover, the thesis work shows that these combustion-generated nanoparticles strongly depend on the type of fuel, type of combustion system and eventual exhaust treatment systems.

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