H. Maruyama, Akihiro Ochiai, Mitsuho Nakakura, Selvan Bellan, Cho Hyun-seok, K. Matsubara
{"title":"Conjugate radiation-convection-conduction simulation of cubic lattice solar receiver with high porosity for high-temperature heat absorption","authors":"H. Maruyama, Akihiro Ochiai, Mitsuho Nakakura, Selvan Bellan, Cho Hyun-seok, K. Matsubara","doi":"10.1299/jtst.22-00057","DOIUrl":"https://doi.org/10.1299/jtst.22-00057","url":null,"abstract":"","PeriodicalId":17405,"journal":{"name":"Journal of Thermal Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66345099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Genta Tsurumaki, Selvan Bellan, K. Matsubara, T. Kodama, Mitsuho Nakakura, Nobuyui Gokon, Hyun-Seok Cho, K. Mani, Sakthivel Shanmugasundaram
{"title":"Fluidization behavior of redox metal oxide and spinel particles to develop high-energy-density thermal energy storage system for concentrated solar power applications","authors":"Genta Tsurumaki, Selvan Bellan, K. Matsubara, T. Kodama, Mitsuho Nakakura, Nobuyui Gokon, Hyun-Seok Cho, K. Mani, Sakthivel Shanmugasundaram","doi":"10.1299/jtst.22-00061","DOIUrl":"https://doi.org/10.1299/jtst.22-00061","url":null,"abstract":"","PeriodicalId":17405,"journal":{"name":"Journal of Thermal Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66345236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Higashi, K. Fukutani, T. Kawaguchi, I. Satoh, T. Saito
{"title":"Effect of shear-thinning behavior on fluid temperature distribution mixed by single rotor","authors":"K. Higashi, K. Fukutani, T. Kawaguchi, I. Satoh, T. Saito","doi":"10.1299/jtst.22-00122","DOIUrl":"https://doi.org/10.1299/jtst.22-00122","url":null,"abstract":"","PeriodicalId":17405,"journal":{"name":"Journal of Thermal Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66345265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An experiment study was conducted on the operational characteristics of the JEST-type loop thermosyphon when an initial liquid level of a working fluid was lowered. This thermosyphon was invented in 2012 by one of the authors with a jet explosion stream technology (JEST) for cooling high-heat-generation and high-heat-flux CPUs. The present experiment aims at lowering the height of the thermosyphon for rack-level thermal management in a datacenter. Hydrofluoroether (HFE)-7000 was used as the working fluid. In experiment, an evaporator section of the thermosyphon was heated with a heating block while a condenser section was water-cooled using a thermostatic bath. Temporal changes in temperatures of the thermosyphon were obtained with thermocouples. Moreover, the circulation flow rate of the working fluid in the thermosyphon was obtained with a simple measurement method. The initial liquid level of the working fluid was changed as 166, 268, 368 mm while the height of the thermosyphon was 1200 mm. Experimental results are shown regarding the effect of the initial liquid level on the circulation flow rates of the vapor and liquid phases of the working fluid as well as the heat transfer coefficient at the evaporator section. An additional experiment was also conducted when the height of the thermosyphon was lowered from 1200 mm to 480 mm. It was confirmed that the thermal performance of the thermosyphon decreased when the initial liquid level was lowered; however, the thermal performance was recovered by lowering the height of the thermosyphon. Therefore, the JEST-type loop thermosyphon can be applied to the rack-level thermal management in a datacenter. was conducted to investigate the heat transfer characteristics of the JEST-type loop thermosyphon. It was shown that the maximum heat transfer rate of the JEST-type loop thermosyphon was 901 W under the condition that the temperature of the evaporator section was less than 90 C. This maximum value of the heat transfer rate corresponds to 127 W/cm 2 at the heated surface of the evaporator section. It was also shown that the heat transfer coefficient at the evaporator section was in the range from 17500 to 46500 W/(m 2 K), implying that the cooling performance of the JEST-type loop thermosyphon is significantly higher than that of conventional thermosyphons, heat pipes and liquid cooling systems. Moreover, in the previous paper by Suzuki et al. (2017), the effect of a heat source size on the operational characteristics and cooling performance of the JEST-type loop thermosyphon was described. Recently, the demand for thermal management in a datacenter is increasing to save the energy used for cooling (Cheng et al., 2021; Ding et al., 2021; Ling et al., 2021). By lowering the height of the JEST-type loop thermosyphon, this thermosyphon could be applied to rack-level thermal management in a datacenter. Effectiveness of this application would be expected because the cooling performance of the JEST-type l
{"title":"Operational characteristics of a JEST-type loop thermosyphon with HFE working fluid (Effect of initial liquid level)","authors":"Yasushi Koito, T. Maki, Ayaka Suzuki, Kaoru Sato","doi":"10.1299/jtst.22-00077","DOIUrl":"https://doi.org/10.1299/jtst.22-00077","url":null,"abstract":"An experiment study was conducted on the operational characteristics of the JEST-type loop thermosyphon when an initial liquid level of a working fluid was lowered. This thermosyphon was invented in 2012 by one of the authors with a jet explosion stream technology (JEST) for cooling high-heat-generation and high-heat-flux CPUs. The present experiment aims at lowering the height of the thermosyphon for rack-level thermal management in a datacenter. Hydrofluoroether (HFE)-7000 was used as the working fluid. In experiment, an evaporator section of the thermosyphon was heated with a heating block while a condenser section was water-cooled using a thermostatic bath. Temporal changes in temperatures of the thermosyphon were obtained with thermocouples. Moreover, the circulation flow rate of the working fluid in the thermosyphon was obtained with a simple measurement method. The initial liquid level of the working fluid was changed as 166, 268, 368 mm while the height of the thermosyphon was 1200 mm. Experimental results are shown regarding the effect of the initial liquid level on the circulation flow rates of the vapor and liquid phases of the working fluid as well as the heat transfer coefficient at the evaporator section. An additional experiment was also conducted when the height of the thermosyphon was lowered from 1200 mm to 480 mm. It was confirmed that the thermal performance of the thermosyphon decreased when the initial liquid level was lowered; however, the thermal performance was recovered by lowering the height of the thermosyphon. Therefore, the JEST-type loop thermosyphon can be applied to the rack-level thermal management in a datacenter. was conducted to investigate the heat transfer characteristics of the JEST-type loop thermosyphon. It was shown that the maximum heat transfer rate of the JEST-type loop thermosyphon was 901 W under the condition that the temperature of the evaporator section was less than 90 C. This maximum value of the heat transfer rate corresponds to 127 W/cm 2 at the heated surface of the evaporator section. It was also shown that the heat transfer coefficient at the evaporator section was in the range from 17500 to 46500 W/(m 2 K), implying that the cooling performance of the JEST-type loop thermosyphon is significantly higher than that of conventional thermosyphons, heat pipes and liquid cooling systems. Moreover, in the previous paper by Suzuki et al. (2017), the effect of a heat source size on the operational characteristics and cooling performance of the JEST-type loop thermosyphon was described. Recently, the demand for thermal management in a datacenter is increasing to save the energy used for cooling (Cheng et al., 2021; Ding et al., 2021; Ling et al., 2021). By lowering the height of the JEST-type loop thermosyphon, this thermosyphon could be applied to rack-level thermal management in a datacenter. Effectiveness of this application would be expected because the cooling performance of the JEST-type l","PeriodicalId":17405,"journal":{"name":"Journal of Thermal Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66345406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design and experimental study of a steam ejector refrigeration system","authors":"Fei Wang, Leihao Wang, X. Pan, Yanan Yang","doi":"10.1299/jtst.22-00287","DOIUrl":"https://doi.org/10.1299/jtst.22-00287","url":null,"abstract":"","PeriodicalId":17405,"journal":{"name":"Journal of Thermal Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66346104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Yamamoto, Kohei Sakaguchi, Wataru Kimura, Wataru Sawada, T. Moriyama
{"title":"Correlation of OH fluorescence and OH chemiluminescence with burning velocity of methane-hydrogen premixed flames","authors":"K. Yamamoto, Kohei Sakaguchi, Wataru Kimura, Wataru Sawada, T. Moriyama","doi":"10.1299/jtst.22-00032","DOIUrl":"https://doi.org/10.1299/jtst.22-00032","url":null,"abstract":"","PeriodicalId":17405,"journal":{"name":"Journal of Thermal Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66344876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Refractive index and mole fraction field of the vapor evaporated from ethanol-water mixture droplet","authors":"P. Jonglearttrakull, K. Fushinobu, M. Kadonaga","doi":"10.1299/jtst.22-00284","DOIUrl":"https://doi.org/10.1299/jtst.22-00284","url":null,"abstract":"","PeriodicalId":17405,"journal":{"name":"Journal of Thermal Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66346356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Heat transfer enhancement by feedback blowing and suction based on vortical structure in turbulent channel flow at low Reynolds number","authors":"Ryota Aoki, H. Mamori, Takeshige Miyazaki","doi":"10.1299/jtst.22-00007","DOIUrl":"https://doi.org/10.1299/jtst.22-00007","url":null,"abstract":"","PeriodicalId":17405,"journal":{"name":"Journal of Thermal Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66344720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hiroto Shibuya, N. Nagumo, Kio Kumagai, A. Sakurai
{"title":"Fundamental study on thermoradiative energy conversion for space applications","authors":"Hiroto Shibuya, N. Nagumo, Kio Kumagai, A. Sakurai","doi":"10.1299/jtst.22-00051","DOIUrl":"https://doi.org/10.1299/jtst.22-00051","url":null,"abstract":"","PeriodicalId":17405,"journal":{"name":"Journal of Thermal Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66344938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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