Results 11 to 20 of about 1,101,968 (217)

Optomechanical cooling and self-stabilization of a waveguide coupled to a whispering-gallery-mode resonator [PDF]

Photonics Research, 2020
Laser cooling of mechanical degrees of freedom is one of the most significant achievements in the field of optomechanics. Here, we report, for the first time to the best of our knowledge, efficient passive optomechanical cooling of the motion of a freestanding waveguide coupled to a whispering-gallery-mode (WGM) resonator. The waveguide is an 8 mm long
Riccardo Pennetta, Shangran Xie, Richard Zeltner, Jonas Hammer, Philip St. J. Russell   +4 more
semanticscholar   +6 more sources

Comparison of the effects on heat transfer through oil oscillation in a steel piston cooling gallery: Friction welding versus laser welding

Case Studies in Thermal Engineering
Piston cooling gallery plays a critical role in managing the temperature of the piston and its performance. This paper aims to study the effect of oscillatory heat transfer within the cooling galleries, focusing on two distinct types: flanged (friction ...
Min Li, Yao hui Yin, Ya hui Liu, Hui yong Du, Xin Wang, Zeng hui Yin   +5 more
doaj   +3 more sources

Numerical Analysis of the Effect of Piston Cooling Gallery Design on Heat Transfer in an Internal Combustion Engine

International Journal of Engineering Research and Advanced Technology, 2019
Internal combustion engines are important machines that make human life easier. Internal combustion engines are developing day by day and higher power density engines are produced. Besides, strict standards of emission and fuel economy are forcing automotive manufacturers to produce environment-friendly engines.
Refik Cevirme, Ovun Isin
semanticscholar   +6 more sources

Analysis of temperature field and thermo-mechanical coupling of oscillating cooling piston [PDF]

Journal of Hebei University of Science and Technology, 2023
In order to analyze the cooling effect of the internal cooling oil gallery on the piston, the temperature field and stress-strain distribution law of the oscillating cooling piston under thermal load, mechanical load and thermo-mechanical coupling were ...
Xiaomeng CHEN, Peiying PENG, Hairong ZHU, Jianhua WANG   +3 more
doaj   +2 more sources

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   +3 more sources

Numerical and experimental investigation on the effect of the two-phase flow pattern on heat transfer of piston cooling gallery

Mechanics & Industry, 2019
To study factors affecting the formation and conversion of two-phase flow pattern as well as the heat transfer of piston cooling gallery, a transient visual target test bench was set up to research the oscillatory flow characteristics in the cooling ...
L. Deng, Jian Zhang, Guannan Hao, Liu Jing   +3 more
semanticscholar   +2 more sources

Thermal Characteristics Investigation of the Internal Combustion Engine Cooling-Combustion System Using Thermal Boundary Dynamic Coupling Method and Experimental Verification

Energies, 2018
The engine cooling system must be able to match up with the stable operating conditions so as to guarantee the engine performance. On the working cycle level, however, the dynamic thermo-state of engines has not been considered in the cooling strategy ...
Junhong Zhang, Zhexuan Xu, Jiewei Lin, Zefeng Lin, Jingchao Wang, Tianshu Xu   +5 more
doaj   +2 more sources

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