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Journal of Thermal Science and Technology
Scopus
ISSN 1880-5566 · The Japan Society of Mechanical Engineers · 699 artikel di indeks
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Artikel Jurnal
Unsteady premixed flame behavior in tapered circular tubes with weak swirling flow
Lean premixed combustors have a narrow stable combustion range compared with diffusion combustors and have flashback. Due to production constraints, the combustor does not usually have a uniform cross-sectional shape. It is important to analyze the propagation behaviors of the lean premixed flame…
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Artikel Jurnal
Investigation on temperature distribution in cold region tunnels during the excavation and optimization for insulating layers
Extra-long highway tunnels in cold regions experience frost heave disasters near the entrances, consequently, the designation of insulation layers is crucial in guaranteeing stability and safety. Temperature distribution functions as a pivotal indicator in assessing the onset of frost heave, which…
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Artikel Jurnal
Development of a four-component reduced mechanism for the replacement of heavy fuel oil: n-hexadecane, n-tetradecane, toluene, 1-methylnaphthalene
Heavy fuel oil (HFO) is the primary fuel used in marine transport. However, the development of a chemical reaction mechanism of HFO combustion in marine engines is relatively slow. To address the limitations of existing mechanisms, enhance simulation capability, and promote the optimization of…
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Artikel Jurnal
Flame propagation and auto-ignition of n-C7H16 / air premixture in high temperature / pressure closed vessel
In this study, the auto-ignition and flame propagation under high temperature and pressure conditions are experimentally investigated. n-C7H16/air mixture is ignited by electric spark at the center of a constant volume vessel of 20-mm inner diameter and 80-mm long under various conditions of…
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Artikel Jurnal
Flameholding characteristics and flame behaviors of a scramjet model combustor with two-stage fuel injection for low flight Mach numbers
In this study, two types of fuel injection methods were applied to a scramjet model combustor equipped with a dual-cavity flameholder and a burned-gas injection to achieve operation at a low flight speed corresponding to a flight Mach number of approximately 3. The first method was single-stage…
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Artikel Jurnal
Formation of a fire whirl behind an L-shaped wall
Crosswind-induced fire whirl generation and development are investigated in this study, with particular emphasis on the effects of crosswind velocity, wind direction, and fuel mass loss rate on flame height and heat release behavior. Time-resolved flame heights and fire-whirl unsteadiness were…
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Artikel Jurnal
Direct numerical simulation of heat transfer between moist air and a human body wearing an air-conditioned vest
Wearable cooling vest with electric fans has become increasingly popular given the rising risk of heat stress in outdoor environments. The fluidic motion of moist air driven by two cooling fans and the heat transfer in both human tissue and moist air were analyzed by using direct numerical…
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Artikel Jurnal
Flame spreading mechanisms over the methane hydrate surface
This study investigates the flame spreading mechanisms on the surface of methane hydrate using numerical simulations with the Fire Dynamics Simulator and Smokeview (FDS-SMV). Methane hydrate, a promising alternative for natural gas transportation, can pose a fire hazard during marine transport…
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Artikel Jurnal
Development of wearable thermal MEMS sensor for sweat-rate measurement
Sweat monitoring is gaining increasing attention as a key component of next-generation health technologies. In this study, we developed a compact and flexible wearable sensor based on microelectromechanical systems (MEMS) technology for real-time sweat rate measurement. The sensor detects thermal…
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Artikel Jurnal
Relaxation enhancement from intra- to intermolecular vibrations in water continuously excited by wavelength-selective infrared radiation
The relaxation from intra- to intermolecular vibrations of water is compared in the cases of the infrared heating that emits the radiation to the infrared absorption band of water with a wavelength-selective emitter and the conductive heating with a heater. The wavelength-selective emitters have a…
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Artikel Jurnal
A deep learning-based approach for 3-D thermal imaging with a single moving camera
We introduce a deep-learning framework that turns a single moving camera into a reliable 3-D sensor for thermal imaging. Portable or drone-mounted inspections increasingly demand lightweight depth acquisition, and passive light field imaging is attractive because it dispenses with active hardware…
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Artikel Jurnal
Temperature and pressure dependencies of diffusion coefficient of carbon dioxide in ionic liquids
In this study, the diffusion coefficients of carbon dioxide (CO2) in ionic liquids were experimentally measured using the phase-shifting interferometer. The temperature dependence of the diffusion coefficient from 298 K to 323 K and the pressure dependence in the range of 0.2 MPa-CO2 to 1.0 MPa-CO2…
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Artikel Jurnal
Convective effects on head-on quenching of premixed flames in a stagnation flow
Head-on quenching (HOQ) is one of the canonical configurations of flame-wall interaction (FWI), where a premixed flame propagates at a normal angle to the wall and quenches. However, few studies have investigated the effect of convective flow on the HOQ process, which is relevant to the turbulent…
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Artikel Jurnal
Direct numerical simulation of turbulent premixed methane-ammonia-air jet flames
Methane-ammonia blended combustion has emerged as a promising strategy to reduce carbon emissions while maximizing the utilization of existing fossil-fuel-based burners, serving as a viable intermediate step towards carbon neutrality. In order to effectively implement methane-ammonia combustion…
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Artikel Jurnal
Frost growth and 3D reconstruction on silver iodide (AgI) dot-patterned surface under desublimation conditions
This study investigates the frost growth behaviors on a silver iodide (AgI) dot-patterned surface under desublimation conditions. The surface was fabricated using a two-step process combining UV lithography and UV nanoimprinting, resulting in a flat substrate with AgI dots embedded in a UV-curable…
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Artikel Jurnal
Detection of difference of fuel composition and combustion process in a spark ignition engine using anomaly score based on principal component analysis of ion current signal
Use of alternative fuels, such as e-fuel , will be more common in automobile industries. However, diversity in fuel composition influences combustion characteristics of an engine, requiring highly-robust control for stable and high-efficient operation. For that purpose, real-time monitoring of…
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Artikel Jurnal
Study on the lean limit and thermal efficiency of an SI engine equipped with newly developed in-cylinder flow-control adapter
Lean combustion technology has been one of the promising approaches for developing next-generation engines with high thermal efficiency and low environmental impact. However, the practical lean limit of such engines is typically constrained by combustion stability. To address this issue, the…
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Artikel Jurnal
Instantaneous energy transfer of water: a comparison between ab initio and classical molecular dynamics
Water is fundamental to a range of natural phenomena and is equally crucial in various engineering applications that demand efficient energy utilization, such as energy conversion with chemical reactions. However, the microscopic mechanisms of energy transfer in water remain unclear. This study…
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Artikel Jurnal
Numerical investigation of the Soret effect on burning velocity of lean hydrogen flame
2D numerical simulations of a wrinkled lean hydrogen (H2)-air premixed flame are performed with and without considering the Soret effect to investigate the Soret effect on flame propagation. The equivalence ratio and temperature of unburnt premixed gas are 0.5 and 300 K, respectively, and ambient…