Results 11 to 20 of about 1,223 (180)

Field synergy analysis of the heat transfer characteristics of cooling oil gallery in highly-intensified piston

Journal of Hebei University of Science and Technology, 2022
In order to study the oscillating heat transfer enhancement mechanism of the cooling oil gallery of highly-enhanced piston,the oscillatory flow and heat transfer process of engine-oil in the cooling oil gallery of piston were analyzed by the field ...
Hairong ZHU, Peiying PENG, Xiaomeng CHEN, Yahui WU, Jianhua WANG   +4 more
doaj   +1 more source

Study on the effect of inclination angle on two-phase oscillating flow and heat transfer characteristics of piston cooling galleries

Case Studies in Thermal Engineering, 2022
The uneven temperature distribution of piston is one of the main reasons for piston fatigue failure. Piston cooling gallery is an effective cooling method to achieve an acceptable piston temperature field.
Guangyi Xie, Jilin Lei, Xiwen Deng, Dewen Jia, Wei Deng, Xiangsen Jiang, Jun Wen   +6 more
doaj   +1 more source

A gallery of cool hypergiants — imaging their circumstellar environments [PDF]

Symposium - International Astronomical Union, 2003
High resolution imaging with HST-wfpc2 of seven of the most luminous evolved cool stars shows that the three OH/IR stars NML Cyg, VX Sgr and S Per have circumstellar nebulae while no ejecta was detected for the M-type supergiant μ Cep and the yellow hypergiants ρ Cas, HR 8752 and HR 5171a.
Michael T. Schuster, Roberta M. Humphreys, Nathan Smith, Kris Davidson, Robert D. Gehrz   +4 more
openaire   +1 more source

Effects of characteristic decomposed modes of the internal flow of a circular 90-degree bent nozzle on the behavior of the oil jet interface

Journal of Fluid Science and Technology, 2021
Methods of decreasing the CO2 emissions of the internal combustion engine have been suggested. For example, an engine can be designed with a high compression ratio and/or a downsizing turbocharger.
Mikimasa KAWAGUCHI, Ryoutaro NAKAYAMA, Lijuan MA, Keiya NISHIDA, Hideaki YOKOHATA, Masanobu KOUTOKU, Jun NISHIKAWA, Akira NAKASHIMA, Yoichi OGATA   +8 more
doaj   +1 more source

Experimental Study on the Effectiveness of Water Mist Extinguishing Systems for Protecting Paintings in Art Gallery Museums: Developing an Initial Methodological Model

Buildings, 2023
Determining the input parameters for the calibration of a water mist extinguishing system in a compartment is important for the evaluation of the performance of the design.
Davide Berardi, Marta Galuppi, Mara Lombardi   +2 more
doaj   +1 more source

Optimization of the Location of the Oil Cooling Gallery in the Diesel Engine Piston [PDF]

The Open Mechanical Engineering Journal, 2016
The oil cooling gallery is arranged at the top of the piston, which can effectively reduce the heat load of the piston. In this paper, finite element analysis and fatigue analysis by FE-safe are used to calculate the effects of the different positions of the oil cooling gallery to the temperature, stress field and the fatigue strength of the bowl rim ...
Lijun Deng, Yongqi Liu, Zhiming Wang, Shiying Liu, Jian Zhang   +4 more
openaire   +2 more sources

Stable yellow light emission from lead-free copper halides single crystals for visible light communication

Nano Materials Science, 2023
Yellow light-emitting diodes (LEDs) as soft light have attracted abundant attention in lithography room, museum and art gallery. However, the development of efficient yellow LEDs lags behind green and blue LEDs, and the available perovskites yellow LEDs ...
Baiqian Wang, Yuru Tang, Xin Yang, Wensi Cai, Ru Li, Wen Ma, Shuangyi Zhao, Chen Chen, Zhigang Zang   +8 more
doaj   +1 more source

Research and analysis of a thermal optimisation design method for aluminium alloy pistons in diesel engines

Case Studies in Thermal Engineering, 2023
To further improve the thermal state of the piston for better thermal design, a multi-objective optimisation algorithm was used in this paper to find the best combination of design variables.
Yang Liu, Jilin Lei, Xiwen Deng, Yi Liu, Dongjun Sun, Yuankan Zhang   +5 more
doaj   +1 more source

An Experimental Investigation of the Influence of Flow and Pipe Diameter on the Fire Extinguishing Efficiency of Nitrogen Injection in a Narrow Confined Underground Space

Fire, 2022
In this study, an underground pipe gallery was taken as the research subject to explore the influence of nitrogen injection flow rate and pipe diameter on the fire extinguishing efficiency in an underground narrow confined space.
Guowei Zhang, Dong Guo, Bin Li, Zhiwei Zhang, Diping Yuan   +4 more
doaj   +1 more source

Effect of flow in the circular 90-degree curved nozzles on ejecting oil jet behavior

Journal of Fluid Science and Technology, 2021
In general, technical methods for improving the thermal efficiency of an engine increase the heat load on peripheral components. Recently, a piston cooling gallery equipped with a flow path has been developed.
Mikimasa KAWAGUCHI, Goichi NITTA, Keita MIMURA, Keiya NISHIDA, Masanobu KOUTOKU, Ryo YAMAMOTO, Akira NAKASHIMA, Yoichi OGATA   +7 more
doaj   +1 more source