Zobrazeno 1 - 10
of 134
pro vyhledávání: '"Akihiro Hayakawa"'
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-10 (2023)
Abstract To understand the generation process of airborne droplets during exhalation, this study investigates the mechanism of bimodal characteristics of the size distribution of droplets generated in a condensed spray flow. The phase change process
Externí odkaz:
https://doaj.org/article/6e9b14081c43499ba7096b76fec134e1
Autor:
Kapuruge Don Kunkuma Amila Somarathne, Hirofumi Yamashita, Sophie Colson, Kohei Oku, Keito Honda, Ekenechukwu Chijioke Okafor, Akihiro Hayakawa, Taku Kudo, Hideaki Kobayashi
Publikováno v:
Applications in Energy and Combustion Science, Vol 16, Iss , Pp 100215- (2023)
This study is a numerical investigation of the potentials of liquid ammonia (LNH3) spray combustion in a gas turbine-like combustor at moderately high pressure. The energy costs for the vaporization of LNH3 and the compression of the fuel vapor in th
Externí odkaz:
https://doaj.org/article/78e08951344c4517aa98fb180875d190
Autor:
Yasuhiro HIGUCHI, Yoshio NUNOME, Satoshi TAKADA, Ryoma YOSHIKAWA, Taku KUDO, Akihiro HAYAKAWA, Hideaki KOBAYASHI
Publikováno v:
Journal of Thermal Science and Technology, Vol 17, Iss 3, Pp 22-00216-22-00216 (2022)
Combustion measurements using laser diagnostics are vital for experimentally revealing both qualitative and quantitative flame characteristics. This paper focuses on the application of the quantitative OH laser-induced fluorescence (OH-LIF) method fo
Externí odkaz:
https://doaj.org/article/fbf3c68440014b0ab3dd3bdc8140fdbf
Autor:
Marina Kovaleva, Akihiro Hayakawa, Sophie Colson, Ekenechukwu C. Okafor, Taku Kudo, Agustin Valera-Medina, Hideaki Kobayashi
Publikováno v:
Fuel Communications, Vol 11, Iss , Pp 100066- (2022)
Externí odkaz:
https://doaj.org/article/611822f2b8ec4cf9b2f8e0be6cc8d4f9
Autor:
Ali Alnasif, Syed Mashruk, Masao Hayashi, Joanna Jójka, Hao Shi, Akihiro Hayakawa, Agustin Valera-Medina
Publikováno v:
Energies, Vol 16, Iss 9, p 3847 (2023)
Ammonia (NH3) has been receiving the attention of researchers as an alternative promising green fuel to replace fossil sources for energy production. However, the high NOx emissions are one of the drawbacks and restrictions of using NH3 on a broad sc
Externí odkaz:
https://doaj.org/article/012f8a67cb504772a9da4663ff606f0b
Autor:
Marina Kovaleva, Akihiro Hayakawa, Sophie Colson, Ekenechukwu C. Okafor, Taku Kudo, Agustin Valera-Medina, Hideaki Kobayashi
Publikováno v:
Fuel Communications, Vol 10, Iss , Pp 100054- (2022)
The adoption of ammonia/hydrocarbon fuel blends can be viewed as an intermediate step towards a hydrogen economy, hence the characterization of methane/ammonia flame product gas trends is essential for designing combustors for a broader range of low-
Externí odkaz:
https://doaj.org/article/8ecf82d203514937ae3d01254253e7d7
Autor:
Syed Mashruk, Marina Kovaleva, Cheng Tung Chong, Akihiro Hayakawa, Ekenechukwu Okafor, Agustin Valera-Medina
Publikováno v:
Chemical Engineering Transactions, Vol 89 (2021)
Alternative fuels are under scrutiny for mitigating carbon dioxide emissions. One of these alternatives is ammonia, which can be produced from waste sources, renewable energy and even nuclear power with potentially zero carbon emissions over most of
Externí odkaz:
https://doaj.org/article/5ca74f4c05f04c29a4e37fc31c7a9d7d
Autor:
Ekenechukwu C. Okafor, Osamu Kurata, Hirofumi Yamashita, Takahiro Inoue, Taku Tsujimura, Norihiko Iki, Akihiro Hayakawa, Shintaro Ito, Masahiro Uchida, Hideaki Kobayashi
Publikováno v:
Applications in Energy and Combustion Science, Vol 7, Iss , Pp 100038- (2021)
The development of liquid ammonia spray combustion technology is expected to reduce the cost and size of gas turbines otherwise fueled with gaseous ammonia. However, successful studies on this topic are scarce due to the difficulty in flame stabiliza
Externí odkaz:
https://doaj.org/article/892dc7a8a3f441f4ad0703d3c2617aca
Autor:
Shun KOBAYASHI, Mitsunobu FUJITA, Takao MORI, Junji SUGIMOTO, Akihiro HAYAKAWA, Shuho YAMADA, Masato INOUE
Publikováno v:
Nihon Kikai Gakkai ronbunshu, Vol 86, Iss 891, Pp 20-00163-20-00163 (2020)
Automobile repair options include three types: new, rebuilt, and reused parts. Both rebuilt and reused parts are manufactured from used parts, so environmental impact and cost are lower than new parts. However, rebuilt parts need more manufacturing p
Externí odkaz:
https://doaj.org/article/77204b7a055547c98c7614c03384db84
Publikováno v:
Mechanical Engineering Journal, Vol 7, Iss 2, Pp 19-00193-19-00193 (2020)
The characterization of the product gas of flames is important not only in the design of combustors but also to provide a fundamental understanding of the phenomenon of combustion. To prevent the disturbance of the flow field during gas sampling, the
Externí odkaz:
https://doaj.org/article/13ca6249b912471db70f1535251d03dd