Qing Nian Chan

Effect of ammonia injection pressure and injector nozzle holes on flash-boiling free sprays

Dongchan Kim, Seung Woo Lee, Qing Nian Chan, Sanghoon Kook

Ammonia sprays undergo significant flash boiling due to its high vapour pressure. Towards effective mixture making critical for ammonia combustion in engines, a fundamental understanding of flash-boiling ammonia sprays is required to which optical diagnostic research could provide useful information. The present …

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Parametric Investigation of Methanol Spray Combustion Under Direct-Injection Conditions

Kirtan Aryal, Guanxiong Zhai, Ruiyuan Cao, Yijun Lin et autres

This study presents a systematic mapping of methanol spray autoignition, lift-off, and flame development across an engine-relevant range of ambient temperatures (1000–1200 K), injection pressures (70–130 MPa), and O2 concentrations (21–15 vol.%), using a single fixed injector and optical configuration. In addition, …

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Biomass-based multifunctional materials enabling smart and environmentally compatible fire warning sensors

Yu Lei, Lulu Xu, Xueyi Zhao, Yu Zhang et autres

Abstract The frequent occurrence of fire disasters has posed a serious threat to the environment, human life and economic systems, thereby driving the development of fire safety strategies. In recent years, significant progress has been achieved in smart fire warning systems, which …

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Techno-Economic Assessment of Integrated Upstream–Downstream Energy Systems for Decarbonized Mining Haulage

Jiayi Li, Guanxiong Zhai, Cheng Wang, Paul R. Medwell et autres

This study presents a techno-economic assessment of integrated upstream–downstream energy systems for open pit mining haulage using hydrogen-diesel dual fuel trucks and battery electric trucks over the period 2025–2050. Both pathways are modeled to deliver an equivalent payload for a representative large …

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Pilot Injection Timing and Dwell-Time Variation Effect on Hydrogen Split Injection

Timothy Letran, Patrick Rorimpandey, Yijun Lin, Guanxiong Zhai et autres

This study evaluated split hydrogen injection with pilot ignition, employing two separate injectors for hydrogen and pilot fuel in a fixed converging configuration. Fuels were injected into a quiescent charge within an optically accessible chamber. Experimental conditions were maintained at an 870 …

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The Influence of Split Injection Ratio on Efficiency and NO x Emissions in a Pilot Diesel-Ignited Hydrogen Direct Injection Engine

Yifan Zhao, Qing Nian Chan, Sanghoon Kook

This study investigates the impact of the hydrogen split injection ratio on the combustion of pilot diesel-ignited hydrogen direct-injection engines, which is expected to affect hydrogen-air mixture conditions and thus flame propagation and diffusion flame developments. Experiments were conducted on a 1-litre …

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Morphological and ReaxFF study on active site in zeolite structure for polypropylene upcycling towards high gas yield production

Chang Tian, Anthony Chun Yin Yuen, Ivan Miguel De Cachinho Cordeiro, Qian Chen et autres

Zeolites offer tunable acidity and porous frameworks, making them an ideal candidate for the plastic upcycling process. However, the efficiency of currently used zeolites has yet to satisfy needs in terms of industrial-scale applications. In-depth understanding is required to realise the catalytic …

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Large-eddy simulation of hydrogen ignition and NOx formation in diesel-pilot dual-fuel combustion

Mark Treacy, Federico Moratto, Ahmad Hadadpour, Patrick Rorimpandey et autres

This study examines the dynamics of diesel/hydrogen dual-fuel combustion in a constant-volume vessel under compression ignition engine conditions, where a small pilot n-heptane (a surrogate of diesel) injection precedes a long-duration hydrogen main injection containing 93.6% of the energy share. We investigate …

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Flame-retardant liquid metal in cellulose/MXene fire warning sensors

Yu Lei, Lulu Xu, Yuan Xien Lee, Yan Zhang et autres

Developing fast, durable, and multifunctional fire-warning sensors remains challenging, as existing materials struggle to combine rapid response, cyclic stability, and robust mechanical and flame-retardant performance. Here, we fabricated Cellulose/MXene-PDA@LM (CMPL) films via sequential layer-by-layer assembly of MXene/cellulose (CM) gel and PDA@LM layers. …

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Morphological and ReaxFF Study on Active Site in Zeolite Structure for Polypropylene Upcycling Towards High Gas Yield Production

Tian Chang, Anthony Chun Yin Yuen, Ivan Miguel De Cachinho Cordeiro, Qian Chen et autres

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A Particle-Resolved CFD Model for Direct Resistive Heating Packed Bed with Coupled Mechanics–Electro–Thermal Effect

Haoyun Zhai, Cheng Wang, Ivan Miguel De Cachinho Cordeiro, Bingzhen Wu et autres

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Application of hydrogen single and split injection strategies in a direct-injection pilot-diesel ignition engine

Yifan Zhao, Qing Nian Chan, Sanghoon Kook

• 95% hydrogen energy achieved in a 1 L/cylinder diesel engine. • Hydrogen injection timing switches combustion mode related to mixture formation. • Advancing second hydrogen injection timing improves power output and efficiency. • Late hydrogen second injection timing effectively reduces NO …

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