Search Results 1-20 of 2029

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Analysis and control of vapor bubble growth inside solid-state nanopores

PAUL Soumyadeep , HSU Wei-Lun , MAGNINI Mirco , MASON Lachlan R. , ITO Yusuke , HO Ya-Lun , MATAR Omar K. , DAIGUJI Hirofumi

… To resolve the accompanying thermal issues, two-phase microchannel heat exchangers using have emerged as one of the promising solutions for cooling purposes. … However, the direct boiling in microchannels and rapid bubble growth give rise to highly unstable heat flux on the channel walls. … This unique characteristic renders nanopores suitable as a nanobubble emitter for microchannel heat exchangers, paving the way for the next generation microelectronic cooling applications. …

Journal of Thermal Science and Technology 16(1), JTST0007-JTST0007, 2021

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2

High Reliability Packaging Technology of Direct Water Double Side Cooled Power Module [in Japanese]

Nakatsu Kinya , Tokuyama Takeshi , Higuma Masato , Sagawa Toshifumi , Mukuno Hideki

… The increasing demand for electric cars, which is part of the rapid progress toward a decarbonized society, has created the need for a reduction in the size and weight of high-output drive systems. … In this report, in order to realize a power module structure that can be immersed in cooling water, the authors report on a bonding mounting technology that reliably attaches both sides of a power semiconductor to an aluminum CAN-shaped metal case. …

Journal of The Japan Institute of Electronics Packaging 24(1), 107-114, 2021

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3

Rapid Evaluation of Hydrogen Embrittlement Resistance for Spot-Welds of High Tensile Strength Steel Sheet by Slow Rate Tensile Shear Test under Hydrogen Charging Conditions [in Japanese]

Kitahara Gaku , Matsuoka Hideaki , Asada Takashi

… Rapid evaluation of the hydrogen embrittlement (HE) resistance for the spot-welds of AHSS sheets is required, since it is worried that the HE resistance of the nugget will deteriorate compared to the base metal due to the difference in microstructure caused by rapid cooling and solidification during spot welding. …

Journal of the Japan Institute of Metals and Materials, 2021

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4

Anomalous strengthening by supersaturated solid solutions of selectively laser melted Al–Si-based alloys

Takata Naoki , Liu Mulin , Kodaira Hirohisa , Suzuki Asuka , Kobashi Makoto

… The microstructural features were formed due to rapid solidification at an extremely high cooling rate in the SLM process, which provides important insights into controlling the strength of Al–Si-based alloys fabricated by SLM.ファイル公開日: 2022/05/01 …

Additive Manufacturing (33), 101152, 2020-05

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Effect of Thermal History on Hot Workability of Fe–Cr Multiphase Steel during Hot Working

Sasaki Shunsuke , Katsumura Tatsuro , Ota Hiroki

… To clarify the effect of the cooling rate immediately before hot working on hot workability, a hot tensile test was carried out with two extremely different cooling rates (0.3°C/s, 10.0°C/s) from the heating temperature of 1250°C. …

MATERIALS TRANSACTIONS, 2020

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Coating of Non-Agglomerated Nickel Nanoparticles with an Organic Solid in a Gas Phase Reactor to Prevent Oxidation

OKADA Yoshiki , TANAKA Masaya , KINOSHITA Takuya

… The non-aggregated Ni nanoparticles produced using a rapid cooling system based on a Laval nozzle in a gas phase reactor were coated with trimethylglycine. …

Earozoru Kenkyu 35(4), 279-284, 2020

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Mechanisms of Phase and Microstructure Formation during the Cooling of "Fe2O3"–CaO–SiO2–Al2O3 Melts in Air and Implications for Iron Ore Sintering

Nicol Stuart , Cheng Siyu , Jak Evgueni , Hayes Peter Charles

… in air to determine the mechanisms of phase and microstructure formation during the cooling.Selected bulk compositions, containing approximately 2 wt% Al2O3 …

ISIJ International 60(12), 2659-2668, 2020

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8

Evaluation of Photosynthetic Responses to Heat Stress in Cucumber Leaf Treated by Dipping into Heating Water Under Illuminated Condition [in Japanese]

NADA Kazuyoshi , MUKOH Satoshi , HIRATSUKA Shin

… Here, we report a rapid and reliable heat stress treatment using temperature-controlled water baths under illuminated conditions. …

Shokubutsu Kankyo Kogaku 32(4), 214-220, 2020

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9

Thermo-Electrochemical convention Integrated into Forced Convention Cooling [in Japanese]

MURAKAMI Yoichi , IKEDA Yutaka

… In our present civilization, forced convection cooling is used in wide-ranging situations from cooling of microprocessors to that of heat engines. … Active cooling is essential in such situations to avoid thermal failure (for microprocessors) and maximize fuel-to-work conversion efficiencies (heat engines). … However, such active cooling causes rapid destruction of the exergy of thermal energy transferred from the heat source. …

Thermal Science and Engineering 28(3), 15-28, 2020

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10

Reduction of Elongation Anisotropy in Cold-Rolled and Annealed Al–7% Si Alloy Strips Fabricated by Vertical-Type High-Speed Twin-Roll Casting

Harada Yohei , Shinohara Hiroki , Goda Tomoo , Kumai Shinji

… Vertical-type high-speed twin-roll casting is a candidate method to realize up-grade recycling of aluminum, in which cast alloy is used to produce wrought alloy products due to its rapid solidification. … Tandem vertical-type high-speed twin-roll casting was used to fabricate a thick strip while maintaining the rapid cooling rate. …

MATERIALS TRANSACTIONS 61(9), 1862-1867, 2020

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11

Evaluation of Deterioration Damage for Liquid Oxygen/Hydrogen Combustion Chamber of Copper Alloy by Replica Method for Oxide Film

Shiwa Mitsuharu , Hayakawa Masao , Hashimoto Tomoyuki , Takegoshi Masao , Sato Eiichi

… Non-destructive damage evaluation of rocket engine combustion chambers was carried out using a replica method that employs a rapid-setting silicone rubber molding agent. … The surface roughness of the light and dark lines parallel to the cooling channels and cracked oxide film was evaluated by laser scanning microscopy. …

MATERIALS TRANSACTIONS 61(9), 1889-1893, 2020

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12

The effect of different cooling procedures on mechanical properties of denture base materials measured by instrumented indentation testing

Polychronakis Nick , Dimitriadi Maria , Ioannidis Alexis , Papadopoulos Triantafyllos

… different cooling procedures on the mechanical properties of five heat-cured polymethyl methacrylate (PMMA) denture materials.Methods: 250 specimens were made equally from Meliodent (ME), Paladon 65 (PA), Probase Hot (PB), Stellon QC-20 (QC) and Vertex Rapid Simplified (VE) implementing five different cooling procedures (n = 10/procedure): A) removal from water bath, bench-cooling (10 min) and cooling under …

Journal of Prosthodontic Research 64(3), 326-331, 2020

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13

Development of a Fast Heat-transport System Utilizing PCM and Heat Pipes [in Japanese]

Ono Naoki

… From those experiments, it was understood that PCM played an important role for receiving rapid and large heat source in the initial period, and that heat pipes and heat sink devices became well activated after the initial period. … The PCM with lower melting temperature was better in cooling the LiB cell. …

Tetsu-to-Hagane 106(8), 564-570, 2020

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14

Phase transformation and heat conduction interaction analysis and sensitivity analysis to temperature in quenching process of steel considering variability in its chemical composition [in Japanese]

FURUKAWA Tatsuya , TAKANO Naoki , SUGIMOTO Tsuyoshi , KIJIMA Shuya , TAMURA Shigeyuki

… As one of the approaches to problem of variability in the thermal deformation of steel products after rapid cooling in the quenching process, a new computational method to evaluate the sensitivity to temperature concerning chemical composition of steel is described in this paper. …

Transactions of the JSME (in Japanese) 86(887), 20-00096-20-00096, 2020

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15

Melt Permeability Changes during Solidification of Aluminum Alloys and Application to Feeding Simulation for Die Castings

Iwata Yasushi , Dong Shuxin , Sugiyama Yoshio , Yaokawa Jun

… Therefore, it is desirable to better understand the feeding behaviors of molten metal under high pressure and rapid cooling conditions in the die casting process. …

MATERIALS TRANSACTIONS 61(7), 1381-1386, 2020

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16

Study on loss-of-cooling and loss-of-coolant accidents in spent fuel pool (confirmation of fuel temperature calculation function with oxidation reaction in the SAMPSON code)

SUZUKI Hiroaki , MORITA Yoshihiro , NAITOH Masanori , NEMOTO Yoshiyuki , KAJI Yoshiyuki

… Experiments done by Sandia National Laboratory using simulated fuel assemblies equivalent to those of an actual BWR plant were analyzed by the modified SAMPSON code to confirm the function of fuel temperature calculation in the event of loss of fuel cooling in the SFP. … The rapid fuel rod temperature rise due to the Zr air oxidation reaction could be reasonably evaluated by the SAMPSON analysis for the radial propagation experiment. …

Mechanical Engineering Journal 7(3), 19-00450-19-00450, 2020

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17

Influence of Molding Conditions on Mechanical Properties in High Cycle Molding of GF/PA 66 Composites Using Commingled Yarn Fabric as an Intermediate Material [in Japanese]

Saito Taiga , Ohtani Akio , Nakai Asami

… The rapid heating and cooling method was used for molding c-FRTP with the intermediate material. …

Seikei-Kakou 32(5), 183-189, 2020

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18

Development of In-situ Orientation Mapping and Microstructure Observation System for Ferrite/Austenite and Martensitic Transformations in Steel

Taniyama Akira , Amino Takafumi , Hata Kengo , Miki Junpei

… The system has the heating capacity over 1000°C and rapid cooling ability of the cooling rate faster than 100°C/s. …

ISIJ International 60(4), 714-720, 2020

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19

A Study for High Efficiency of Diesel Engine in the High Load Operation (Fourth Report):- Effects of Nozzle Hole Shape on Combustion Process and Thermal Efficiency - [in Japanese]

Fujikawa Shoya , Arai Naoyuki , Iwamoto Seiya , Nishiura Kohsuke , Matsumura Eriko , Senda Jiro

… Previous study showed that promoting evaporation with the mixed fuel was able to realize early evaporation and compact spray, which contributed to cooling loss reduction and thermal efficiency improvement. … The effects of this nozzle on thermal efficiency and combustion process were examined by using diesel engine, and its combustion mechanism was revealed by using RCEM (Rapid Compression and Expansion Machine). …

Transactions of Society of Automotive Engineers of Japan 51(3), 404-409, 2020

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20

Damage evolution of TBC by rapid thermal cycling test based on a laser irradiation [in Japanese]

HAYASHI Yusuke , SUZUKI Kento , ARAI Masayuki , ITO Kiyohiro , HIGUCHI Tsuyoshi , SUIDZU Tatsuo

… In this study, the rapid thermal cycling device based on a laser irradiation was developed. … It was then investigated how those damages progress in TC subjected to rapid thermal cyclic loading based on the cross-sectional observation and the monitoring of acoustic emission (AE). … The monitoring of AE revealed that these cracks are initiated in cooling periods and vertical cracks are also formed in TC at early stage of thermal cycles. …

Transactions of the JSME (in Japanese) 86(883), 19-00426-19-00426, 2020

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