Staff View: Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment

Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment

The conventional multi-scale modelling approach that predicts carbon nanotube (CNT) growth region in heterogeneous flame environment is computationally exhaustive. Thus, the present study is the first attempt to develop a zero-dimensional model based on existing multi-scale model where mixture fract...

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Main Authors:	Zainal, Muhammad Thalhah, Hamzah, Norikhwan, Abdul Wahid, Mazlan, Kamaruzaman, Natrah, Chong, Cheng Tung, Ani, Mohd. Hanafi, Amzin, Shokri, Das, Tarit, Mohd. Yasin, Mohd. Fairus
Format:	Article
Published:	Springer 2023
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/105759/ http://dx.doi.org/10.1007/s42823-023-00579-z
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spelling	my.utm.1057592024-05-15T07:11:35Z http://eprints.utm.my/105759/ Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment Zainal, Muhammad Thalhah Hamzah, Norikhwan Abdul Wahid, Mazlan Kamaruzaman, Natrah Chong, Cheng Tung Ani, Mohd. Hanafi Amzin, Shokri Das, Tarit Mohd. Yasin, Mohd. Fairus TJ Mechanical engineering and machinery The conventional multi-scale modelling approach that predicts carbon nanotube (CNT) growth region in heterogeneous flame environment is computationally exhaustive. Thus, the present study is the first attempt to develop a zero-dimensional model based on existing multi-scale model where mixture fraction z and the stoichiometric mixture fraction zst are employed to correlate burner operating conditions and CNT growth region for diffusion flames. Baseline flame models for inverse and normal diffusion flames are first established with satisfactory validation of the flame temperature and growth region prediction at various operating conditions. Prior to developing the correlation, investigation on the effects of zst on CNT growth region is carried out for 17 flame conditions with zst of 0.05 to 0.31. The developed correlation indicates linear (zlb =1.54 zst +0.11) and quadratic (zhb = zst (7-13 zst)) models for the zlb and zhb corresponding to the low and high boundaries of mixture fraction, respectively, where both parameters dictate the range of CNT growth rate (GR) in the mixture fraction space. Based on the developed correlations, the CNT growth in mixture fraction space is optimum in the flame with medium-range zst conditions between 0.15 and 0.25. The stronger relationship between growth-region mixture-fraction (GRMF) and zst at the near field region close to the flame sheet compared to that of the far field region away from the flame sheet is due to the higher temperature gradient at the former region compared to that of the latter region. The developed models also reveal three distinct regions that are early expansion, optimum, and reduction of GRMF at varying zst. Springer 2023 Article PeerReviewed Zainal, Muhammad Thalhah and Hamzah, Norikhwan and Abdul Wahid, Mazlan and Kamaruzaman, Natrah and Chong, Cheng Tung and Ani, Mohd. Hanafi and Amzin, Shokri and Das, Tarit and Mohd. Yasin, Mohd. Fairus (2023) Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment. Carbon Letters, 33 (7). pp. 2199-2210. ISSN 1976-4251 http://dx.doi.org/10.1007/s42823-023-00579-z DOI : 10.1007/s42823-023-00579-z
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Zainal, Muhammad Thalhah Hamzah, Norikhwan Abdul Wahid, Mazlan Kamaruzaman, Natrah Chong, Cheng Tung Ani, Mohd. Hanafi Amzin, Shokri Das, Tarit Mohd. Yasin, Mohd. Fairus Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment
description	The conventional multi-scale modelling approach that predicts carbon nanotube (CNT) growth region in heterogeneous flame environment is computationally exhaustive. Thus, the present study is the first attempt to develop a zero-dimensional model based on existing multi-scale model where mixture fraction z and the stoichiometric mixture fraction zst are employed to correlate burner operating conditions and CNT growth region for diffusion flames. Baseline flame models for inverse and normal diffusion flames are first established with satisfactory validation of the flame temperature and growth region prediction at various operating conditions. Prior to developing the correlation, investigation on the effects of zst on CNT growth region is carried out for 17 flame conditions with zst of 0.05 to 0.31. The developed correlation indicates linear (zlb =1.54 zst +0.11) and quadratic (zhb = zst (7-13 zst)) models for the zlb and zhb corresponding to the low and high boundaries of mixture fraction, respectively, where both parameters dictate the range of CNT growth rate (GR) in the mixture fraction space. Based on the developed correlations, the CNT growth in mixture fraction space is optimum in the flame with medium-range zst conditions between 0.15 and 0.25. The stronger relationship between growth-region mixture-fraction (GRMF) and zst at the near field region close to the flame sheet compared to that of the far field region away from the flame sheet is due to the higher temperature gradient at the former region compared to that of the latter region. The developed models also reveal three distinct regions that are early expansion, optimum, and reduction of GRMF at varying zst.
format	Article
author	Zainal, Muhammad Thalhah Hamzah, Norikhwan Abdul Wahid, Mazlan Kamaruzaman, Natrah Chong, Cheng Tung Ani, Mohd. Hanafi Amzin, Shokri Das, Tarit Mohd. Yasin, Mohd. Fairus
author_facet	Zainal, Muhammad Thalhah Hamzah, Norikhwan Abdul Wahid, Mazlan Kamaruzaman, Natrah Chong, Cheng Tung Ani, Mohd. Hanafi Amzin, Shokri Das, Tarit Mohd. Yasin, Mohd. Fairus
author_sort	Zainal, Muhammad Thalhah
title	Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment
title_short	Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment
title_full	Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment
title_fullStr	Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment
title_full_unstemmed	Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment
title_sort	zero-dimensional model for the prediction of carbon nanotube (cnt) growth region in heterogeneous methane-flame environment
publisher	Springer
publishDate	2023
url	http://eprints.utm.my/105759/ http://dx.doi.org/10.1007/s42823-023-00579-z
_version_	1800082659346481152
score	13.211869

Zero-dimensional model for the prediction of carbon nanotube (CNT) growth region in heterogeneous methane-flame environment

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