Pub Date : 2023-01-02DOI: 10.1080/15567265.2023.2167532
M. Y. Raïâ, R. Masrour, M. Hamedoun, J. Kharbach, A. Rezzouk, A. Hourmatallah, N. Benzakour, K. Bouslykhane
ABSTRACT Both L21 and XA type phases ordering of Ti2FeGe compound were investigated based on density functional theory. The structural, magnetic, band structure, density of states, possibility of martensitic transformation, elastic, thermoelectric and optical properties were studied. From the calculated total energy, we noted that L21 type in ferromagnetic state is more stable phase using GGA+U approach. The computed elastic constants of considered compound show that L21 type is ductile, anisotropic and mechanically stable, while the XA phase ordering of Ti2FeGe is not mechanically stable. The (DOS) and band structure of L21 type structure of Ti2FeGe alloy show metallic character in both spin up and spin down directions, while the XA type structure exhibits half-metallic character. Based on quasi-harmonic Debye model applied in the Gibbs program, the lattice vibrational, the bulk modulus, the Debye temperature, the heat capacity, the entropy, the coefficient of thermal expansion and the Grüneisen parameter have also been estimated. The thermoelectric properties of two phases are examined and discussed through consideration of transport coefficients. The optical properties are systematically studied by computing the optical parameters. The obtained results will bring perspective for designing theoretical predictions and experimental studies intended to serve as a reference for future studies on optoelectronic and spintronic applications.
{"title":"Structural stability, electronic, magnetic, elastic, thermal, thermoelectric and optical properties of L21 and xa phases of Ti2fege heusler compound: GGA and GGA+U methods","authors":"M. Y. Raïâ, R. Masrour, M. Hamedoun, J. Kharbach, A. Rezzouk, A. Hourmatallah, N. Benzakour, K. Bouslykhane","doi":"10.1080/15567265.2023.2167532","DOIUrl":"https://doi.org/10.1080/15567265.2023.2167532","url":null,"abstract":"ABSTRACT Both L21 and XA type phases ordering of Ti2FeGe compound were investigated based on density functional theory. The structural, magnetic, band structure, density of states, possibility of martensitic transformation, elastic, thermoelectric and optical properties were studied. From the calculated total energy, we noted that L21 type in ferromagnetic state is more stable phase using GGA+U approach. The computed elastic constants of considered compound show that L21 type is ductile, anisotropic and mechanically stable, while the XA phase ordering of Ti2FeGe is not mechanically stable. The (DOS) and band structure of L21 type structure of Ti2FeGe alloy show metallic character in both spin up and spin down directions, while the XA type structure exhibits half-metallic character. Based on quasi-harmonic Debye model applied in the Gibbs program, the lattice vibrational, the bulk modulus, the Debye temperature, the heat capacity, the entropy, the coefficient of thermal expansion and the Grüneisen parameter have also been estimated. The thermoelectric properties of two phases are examined and discussed through consideration of transport coefficients. The optical properties are systematically studied by computing the optical parameters. The obtained results will bring perspective for designing theoretical predictions and experimental studies intended to serve as a reference for future studies on optoelectronic and spintronic applications.","PeriodicalId":49784,"journal":{"name":"Nanoscale and Microscale Thermophysical Engineering","volume":"27 1","pages":"1 - 24"},"PeriodicalIF":4.1,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44017533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-28DOI: 10.1080/15567265.2022.2151717
Hua-Dong Huang, Shi-quan Shan, Zhijun Zhou
ABSTRACT The black phosphorus (BP)/hexagonal boron nitride (hBN) Van der Waals heterostructure has great potential application in BP-based devices due to its higher stability than monolayer BP film. The near-field thermal radiation (NFTR) between two identical BP/hBN heterostructures with high electron density is studied to promote the application of BP-based devices. The BP/hBN heterostructures show a higher heat transfer coefficient (HTC) at a 10 nm gap distance compared to BP films with electron density n larger than 1 × 1013 cm−2, due to the coupling of surface plasmon polaritons (SPPs) and hyperbolic phonon polaritons (HPPs). Especially at n ≥ 3 × 1013 cm−2, the improvement is more than 100%. The SPPs and the HPPs couple into surface plasmon-phonon polaritons (SPPPs) out of the hyperbolic region and hyperbolic plasmon-phonon polaritons (HPPPs) inside. The SPPPs can achieve photon tunneling in the broader wavevector region than SPPs, making most of the contribution to heat transfer. The influences of the thickness of the hBN sheet and gap distance are also discussed. This scheme only effectively enhances NFTR for BP with high electron density at small nanogaps. After structural optimization, h = 2 nm is the optimal thickness for BP/hBN configuration with low electron density, such as n = 1 × 1013 cm−2. In contrast, large thickness h = 500 nm is optimal for BP with high electron density. At high electron density, a thick hBN sheet is prominent in enhancing the SPPPs in the frequencies below the type-I region and the HPPPs inside the type-II region. We further propose BP/hBN/BP heterostructures and find that HTC is further enhanced by 4.4% ~ 30.8% due to the more robust surface modes. Our work may contribute to developing BP-based near-field thermal devices and promote understanding the NFTR mechanism of BP/hBN heterostructure.
{"title":"Enhanced near-field thermal radiation between black phosphorus with high electron density by BP/hBN heterostructures","authors":"Hua-Dong Huang, Shi-quan Shan, Zhijun Zhou","doi":"10.1080/15567265.2022.2151717","DOIUrl":"https://doi.org/10.1080/15567265.2022.2151717","url":null,"abstract":"ABSTRACT The black phosphorus (BP)/hexagonal boron nitride (hBN) Van der Waals heterostructure has great potential application in BP-based devices due to its higher stability than monolayer BP film. The near-field thermal radiation (NFTR) between two identical BP/hBN heterostructures with high electron density is studied to promote the application of BP-based devices. The BP/hBN heterostructures show a higher heat transfer coefficient (HTC) at a 10 nm gap distance compared to BP films with electron density n larger than 1 × 1013 cm−2, due to the coupling of surface plasmon polaritons (SPPs) and hyperbolic phonon polaritons (HPPs). Especially at n ≥ 3 × 1013 cm−2, the improvement is more than 100%. The SPPs and the HPPs couple into surface plasmon-phonon polaritons (SPPPs) out of the hyperbolic region and hyperbolic plasmon-phonon polaritons (HPPPs) inside. The SPPPs can achieve photon tunneling in the broader wavevector region than SPPs, making most of the contribution to heat transfer. The influences of the thickness of the hBN sheet and gap distance are also discussed. This scheme only effectively enhances NFTR for BP with high electron density at small nanogaps. After structural optimization, h = 2 nm is the optimal thickness for BP/hBN configuration with low electron density, such as n = 1 × 1013 cm−2. In contrast, large thickness h = 500 nm is optimal for BP with high electron density. At high electron density, a thick hBN sheet is prominent in enhancing the SPPPs in the frequencies below the type-I region and the HPPPs inside the type-II region. We further propose BP/hBN/BP heterostructures and find that HTC is further enhanced by 4.4% ~ 30.8% due to the more robust surface modes. Our work may contribute to developing BP-based near-field thermal devices and promote understanding the NFTR mechanism of BP/hBN heterostructure.","PeriodicalId":49784,"journal":{"name":"Nanoscale and Microscale Thermophysical Engineering","volume":"27 1","pages":"42 - 54"},"PeriodicalIF":4.1,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48543821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-02DOI: 10.1080/15567265.2022.2146025
İbrahim Atmaca, Osman Samet Özdemir, A. Çağlar, Sezgi Koçak Soylu, M. Asiltürk
ABSTRACT This study investigates the impact of core-shell based nanofluids on the thermal performance of a solar water heating system by studying the changes in the useful heat gain and collector efficiency. This work would be the first to report the use of core-shell nanoparticles in solar water heating systems. The core-shell structure allows for dual improvements in thermal conductivity and better nanofluid stability, even without a surfactant. Therefore, three novel nanofluids were prepared by adding 2 wt% TiO2@SiO2, Fe3O4@SiO2, and ZnO@SiO2 core-shell nanoparticles to pure water to be used in the experiments. The experimental thermal performances of the nanofluids were individually compared with pure water by the simultaneous operation of two identical systems. The results showed that the nanofluids with Fe3O4@SiO2 and ZnO@SiO2 particles had better performance than the base fluid. In particular, 16.65% and 5.40% increase in the useful energy gain and a 17.12% and 7.39% increase in the collector efficiency were observed with Fe3O4@SiO2 and ZnO@SiO2 core-shell based nanofluids, respectively. It is possible to conclude that, with their improved performance, the Fe3O4@SiO2-based nanofluids have great potential to be used in solar hot water systems instead of water.
{"title":"Thermal Performance Testing of a Solar Water Heating System Using Core-Shell Structured Nanofluids","authors":"İbrahim Atmaca, Osman Samet Özdemir, A. Çağlar, Sezgi Koçak Soylu, M. Asiltürk","doi":"10.1080/15567265.2022.2146025","DOIUrl":"https://doi.org/10.1080/15567265.2022.2146025","url":null,"abstract":"ABSTRACT This study investigates the impact of core-shell based nanofluids on the thermal performance of a solar water heating system by studying the changes in the useful heat gain and collector efficiency. This work would be the first to report the use of core-shell nanoparticles in solar water heating systems. The core-shell structure allows for dual improvements in thermal conductivity and better nanofluid stability, even without a surfactant. Therefore, three novel nanofluids were prepared by adding 2 wt% TiO2@SiO2, Fe3O4@SiO2, and ZnO@SiO2 core-shell nanoparticles to pure water to be used in the experiments. The experimental thermal performances of the nanofluids were individually compared with pure water by the simultaneous operation of two identical systems. The results showed that the nanofluids with Fe3O4@SiO2 and ZnO@SiO2 particles had better performance than the base fluid. In particular, 16.65% and 5.40% increase in the useful energy gain and a 17.12% and 7.39% increase in the collector efficiency were observed with Fe3O4@SiO2 and ZnO@SiO2 core-shell based nanofluids, respectively. It is possible to conclude that, with their improved performance, the Fe3O4@SiO2-based nanofluids have great potential to be used in solar hot water systems instead of water.","PeriodicalId":49784,"journal":{"name":"Nanoscale and Microscale Thermophysical Engineering","volume":"26 1","pages":"218 - 241"},"PeriodicalIF":4.1,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44648281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-02DOI: 10.1080/15567265.2022.2138803
Abdul Khaliq Mokhtar, N. Mohd Hidzir, F. Mohamed, I. Abdul Rahman, S. Mohd Fadzil, Afifah Mardhiah Mohamed Radzi, N. A. Mohd Radzali
ABSTRACT Radiotherapy is an established therapy in cancer treatments that uses energy deposition directly into tumor tissue. With the introduction of radiosensitizers, invasive surgical and chemotherapy techniques can be avoided. Radiosensitizers with a high-Z base such as gold nanoparticles (AuNPs) are promising candidates for catalyzing tumor injury and simultaneously enabling tracking to be done inside the organ via a computed tomography scan or other diagnostic imaging. It has been documented that AuNP possess biocompatibility characteristics as well as nontoxic properties depending on the size of the application and the applied coating. Radiosensitizers can increase tumor targeting, thus providing more specific destruction than conventional techniques while minimizing damage to surrounding healthy tissues. This review focuses on the special properties of AuNP in assisting radiotherapy as a radiosensitizing agent. Important parameters for AuNP’s optimization are listed to offer general guidelines for which the specifications of AuNP should be directed. In addition, the mechanism of AuNP radiosensitization in physical, chemical, and biological phases is discussed. A list of in vitro and in vivo testing and current clinical trials of AuNP are presented in sequence. Finally, the utilization of AuNP for diagnosing and combating the COVID-19 pandemic is discussed for future outbreak surveillance and intervention.
{"title":"Gold nanoparticles as radiosensitizer for radiotherapy and diagnosis of COVID-19: A review","authors":"Abdul Khaliq Mokhtar, N. Mohd Hidzir, F. Mohamed, I. Abdul Rahman, S. Mohd Fadzil, Afifah Mardhiah Mohamed Radzi, N. A. Mohd Radzali","doi":"10.1080/15567265.2022.2138803","DOIUrl":"https://doi.org/10.1080/15567265.2022.2138803","url":null,"abstract":"ABSTRACT Radiotherapy is an established therapy in cancer treatments that uses energy deposition directly into tumor tissue. With the introduction of radiosensitizers, invasive surgical and chemotherapy techniques can be avoided. Radiosensitizers with a high-Z base such as gold nanoparticles (AuNPs) are promising candidates for catalyzing tumor injury and simultaneously enabling tracking to be done inside the organ via a computed tomography scan or other diagnostic imaging. It has been documented that AuNP possess biocompatibility characteristics as well as nontoxic properties depending on the size of the application and the applied coating. Radiosensitizers can increase tumor targeting, thus providing more specific destruction than conventional techniques while minimizing damage to surrounding healthy tissues. This review focuses on the special properties of AuNP in assisting radiotherapy as a radiosensitizing agent. Important parameters for AuNP’s optimization are listed to offer general guidelines for which the specifications of AuNP should be directed. In addition, the mechanism of AuNP radiosensitization in physical, chemical, and biological phases is discussed. A list of in vitro and in vivo testing and current clinical trials of AuNP are presented in sequence. Finally, the utilization of AuNP for diagnosing and combating the COVID-19 pandemic is discussed for future outbreak surveillance and intervention.","PeriodicalId":49784,"journal":{"name":"Nanoscale and Microscale Thermophysical Engineering","volume":"26 1","pages":"161 - 187"},"PeriodicalIF":4.1,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44499184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-21DOI: 10.1080/15567265.2022.2122911
Mingming Lv, Zhigang Liu, Wen-fei Chi, Chao Ma, Lian Duan
ABSTRACT In this study, the flow behavior of deionized water through the staggered circular micro pin fin arrays with three longitudinal spacings (S L = 2D, 3D and 4D) is investigated using flow visualization technology of micro particle image velocimetry (micro-PIV) in the range of Re = 100–800. The streamline distribution and velocity field in the three micro pin fin arrays are obtained. Experimental results indicate that the longitudinal spacing has considerable effect on both the extension of the wake region and velocity field around pin fins. The small longitudinal spacing hinders the extension of the wake region behind the pin fin and delays the vortex shedding. The micro pin fin array with S L = 2D provides maximum velocity span and transverse velocity, indicating intense local fluid mixing. The flow and heat transfer characteristics in the microchannel with a single circular micro pin fin are also studied. By comparison, the feature of the wake region in the micro pin fin array with a large longitudinal spacing is similar to that in the flow past a single micro pin fin. Moreover, vortex shedding occurs in the micro pin fin array at higher Reynolds number. The correlation between velocity field and temperature field around the pin fin is investigated. The belt zone with enhanced heat transfer around the pin fin is consistent with the distribution of fluid with high velocities. Vortex shedding can obviously enhance the heat transfer downstream of the micro pin fin.
{"title":"Investigation on Flow Through Staggered Micro Pin Fin Arrays with Variable Longitudinal Spacings Using Micro-PIV","authors":"Mingming Lv, Zhigang Liu, Wen-fei Chi, Chao Ma, Lian Duan","doi":"10.1080/15567265.2022.2122911","DOIUrl":"https://doi.org/10.1080/15567265.2022.2122911","url":null,"abstract":"ABSTRACT In this study, the flow behavior of deionized water through the staggered circular micro pin fin arrays with three longitudinal spacings (S L = 2D, 3D and 4D) is investigated using flow visualization technology of micro particle image velocimetry (micro-PIV) in the range of Re = 100–800. The streamline distribution and velocity field in the three micro pin fin arrays are obtained. Experimental results indicate that the longitudinal spacing has considerable effect on both the extension of the wake region and velocity field around pin fins. The small longitudinal spacing hinders the extension of the wake region behind the pin fin and delays the vortex shedding. The micro pin fin array with S L = 2D provides maximum velocity span and transverse velocity, indicating intense local fluid mixing. The flow and heat transfer characteristics in the microchannel with a single circular micro pin fin are also studied. By comparison, the feature of the wake region in the micro pin fin array with a large longitudinal spacing is similar to that in the flow past a single micro pin fin. Moreover, vortex shedding occurs in the micro pin fin array at higher Reynolds number. The correlation between velocity field and temperature field around the pin fin is investigated. The belt zone with enhanced heat transfer around the pin fin is consistent with the distribution of fluid with high velocities. Vortex shedding can obviously enhance the heat transfer downstream of the micro pin fin.","PeriodicalId":49784,"journal":{"name":"Nanoscale and Microscale Thermophysical Engineering","volume":"26 1","pages":"198 - 217"},"PeriodicalIF":4.1,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43583344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-20DOI: 10.1080/15567265.2022.2125857
Junaid Khan, M. Jaafar
ABSTRACT The role of electronic devices in our lives is increasing rapidly, with more research focusing on miniaturization, creating more demand for thermal interface materials (TIM). Grease-based TIM presently available have good thermal conductivity values, but issues such as contamination, pump-out, and an additional curing step are observed. Fibrous textile substrates are soft and flexible, making them suitable for occupying the asperities between the heat sink and heat-producing devices. However, they are insulating in nature and can be made conductive using conductive fillers such as graphene oxide (GO). In this article, a networked through-plane thermally conductive TIM using the cutting waste of polyester and GO was fabricated. The methodology involved functionalizing the PET substrate and studying its interaction with GO. A networked GO/PET, (N-GOPET) hybrid TIM was fabricated from waste PET with good through-plane heat conduction performance, softness, and cuttability as a promising replacement for grease-based TIM.
{"title":"Through Plane Networked Graphene Oxide/Polyester Hybrid Thermal Interface Material for Heat Management Applications","authors":"Junaid Khan, M. Jaafar","doi":"10.1080/15567265.2022.2125857","DOIUrl":"https://doi.org/10.1080/15567265.2022.2125857","url":null,"abstract":"ABSTRACT The role of electronic devices in our lives is increasing rapidly, with more research focusing on miniaturization, creating more demand for thermal interface materials (TIM). Grease-based TIM presently available have good thermal conductivity values, but issues such as contamination, pump-out, and an additional curing step are observed. Fibrous textile substrates are soft and flexible, making them suitable for occupying the asperities between the heat sink and heat-producing devices. However, they are insulating in nature and can be made conductive using conductive fillers such as graphene oxide (GO). In this article, a networked through-plane thermally conductive TIM using the cutting waste of polyester and GO was fabricated. The methodology involved functionalizing the PET substrate and studying its interaction with GO. A networked GO/PET, (N-GOPET) hybrid TIM was fabricated from waste PET with good through-plane heat conduction performance, softness, and cuttability as a promising replacement for grease-based TIM.","PeriodicalId":49784,"journal":{"name":"Nanoscale and Microscale Thermophysical Engineering","volume":"26 1","pages":"188 - 197"},"PeriodicalIF":4.1,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46642185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/15567265.2022.2093297
Hao Wu, C. Li, Jie Li
ABSTRACT In order to improve the heat transfer performance of the microchannel heat exchanger, a composite heat transfer enhancement method was proposed. Viscoelastic fluid was used as working fluid in pulsating flow condition, and rib plates were added to the microchannel to bring extra disturbance to the flow. The Oldroyd-B constitutive model of the viscoelastic fluid was used in the numerical simulation, and the flow field, temperature field, Nusselt number (Nu), and pressure drop were analyzed when the average Reynolds number (Re) is 10. Both Strouhal number (St) and amplitude are important factors affecting heat transfer, but they have an insignificant influence on pressure drop at low Reynolds number. The St = 0.125 and amplitude A = 0.8 are better parameters. The increase of Weissenberg number (Wi) will cause the vortex to split into several subsidiary vortexes during its development, which will also develop to various positions in the channel, thus further enhancing the heat transfer. When the Wi is in the range of 1 ~ 5, the performance evaluation criteria rises at a relatively fast rate, from 1 to 1.404.
{"title":"Heat transfer enhancement by pulsating flow of a viscoelastic fluid in a microchannel with a rib plate","authors":"Hao Wu, C. Li, Jie Li","doi":"10.1080/15567265.2022.2093297","DOIUrl":"https://doi.org/10.1080/15567265.2022.2093297","url":null,"abstract":"ABSTRACT In order to improve the heat transfer performance of the microchannel heat exchanger, a composite heat transfer enhancement method was proposed. Viscoelastic fluid was used as working fluid in pulsating flow condition, and rib plates were added to the microchannel to bring extra disturbance to the flow. The Oldroyd-B constitutive model of the viscoelastic fluid was used in the numerical simulation, and the flow field, temperature field, Nusselt number (Nu), and pressure drop were analyzed when the average Reynolds number (Re) is 10. Both Strouhal number (St) and amplitude are important factors affecting heat transfer, but they have an insignificant influence on pressure drop at low Reynolds number. The St = 0.125 and amplitude A = 0.8 are better parameters. The increase of Weissenberg number (Wi) will cause the vortex to split into several subsidiary vortexes during its development, which will also develop to various positions in the channel, thus further enhancing the heat transfer. When the Wi is in the range of 1 ~ 5, the performance evaluation criteria rises at a relatively fast rate, from 1 to 1.404.","PeriodicalId":49784,"journal":{"name":"Nanoscale and Microscale Thermophysical Engineering","volume":"26 1","pages":"112 - 128"},"PeriodicalIF":4.1,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44296982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/15567265.2022.2108949
H. Alimoradi, Erfan Eskandari, Mahdi Pourbagian, M. Shams
ABSTRACT Utilizing an Euler-mixture three-dimensional numerical simulation for Al2O3/water nanofluid subcooled flow boiling in a mini channel, we study the effects of pressure, heat flux, nanoparticle concentration, surface roughness, and subcooled temperature on heat transfer quantities (average and local heat transfer coefficient, average and local vapor volume fraction, and average and local wall temperature) and bubble dynamics quantities (bubble departure diameter, bubble detachment frequency, bubble detachment waiting time, and nucleation site density). The numerical results demonstrate that the nanoparticles particularly impact the bubble dynamics significantly by increasing wettability and decreasing contact angle. In order to reduce the computational burden of such an expensive multiphase flow simulation, we also present a machine learning approach based on artificial neural networks (ANN). The numerical experiments show that using the ANN model, we can achieve highly accurate results with much less computational time and resources.
{"title":"A parametric study of subcooled flow boiling of Al2O3/water nanofluid using numerical simulation and artificial neural networks","authors":"H. Alimoradi, Erfan Eskandari, Mahdi Pourbagian, M. Shams","doi":"10.1080/15567265.2022.2108949","DOIUrl":"https://doi.org/10.1080/15567265.2022.2108949","url":null,"abstract":"ABSTRACT Utilizing an Euler-mixture three-dimensional numerical simulation for Al2O3/water nanofluid subcooled flow boiling in a mini channel, we study the effects of pressure, heat flux, nanoparticle concentration, surface roughness, and subcooled temperature on heat transfer quantities (average and local heat transfer coefficient, average and local vapor volume fraction, and average and local wall temperature) and bubble dynamics quantities (bubble departure diameter, bubble detachment frequency, bubble detachment waiting time, and nucleation site density). The numerical results demonstrate that the nanoparticles particularly impact the bubble dynamics significantly by increasing wettability and decreasing contact angle. In order to reduce the computational burden of such an expensive multiphase flow simulation, we also present a machine learning approach based on artificial neural networks (ANN). The numerical experiments show that using the ANN model, we can achieve highly accurate results with much less computational time and resources.","PeriodicalId":49784,"journal":{"name":"Nanoscale and Microscale Thermophysical Engineering","volume":"26 1","pages":"129 - 159"},"PeriodicalIF":4.1,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49013513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/15567265.2022.2121120
P. Norris, C. Tien, D. Cahill, G. Celata, Hsin-Chen Chu, J. Greffet, Jong Sik Lee, Y. Peles, R. Prasher, Evelyn Wang, Gang Chen, K. Goodson, A. Majumdar, S. Maruyama, D. Donadio, Bong Jae Lee, Deyu Li, J. Lukes, N. Miljkovic, J. Shiomi, Y. Won, Ronggui Yang
What exciting times we are living in! Our ability to measure, model, predict, and influence the thermophysical properties of materials at the microand nanoscale is now enabling exciting new advances with potential positive impacts in many important areas such energy, environment, information, medicine, and transportation. This journal, which was begun in 1997 by my post-doctoral advisor, Chang-Lin Tien, under the title “Microscale Thermophysical Engineering” was established at the very beginning of the nanotechnology revolution and it has always been a forum for thought leadership.
{"title":"Editorial for Issue 2/3 by Pamela M. Norris, Editor-in-Chief","authors":"P. Norris, C. Tien, D. Cahill, G. Celata, Hsin-Chen Chu, J. Greffet, Jong Sik Lee, Y. Peles, R. Prasher, Evelyn Wang, Gang Chen, K. Goodson, A. Majumdar, S. Maruyama, D. Donadio, Bong Jae Lee, Deyu Li, J. Lukes, N. Miljkovic, J. Shiomi, Y. Won, Ronggui Yang","doi":"10.1080/15567265.2022.2121120","DOIUrl":"https://doi.org/10.1080/15567265.2022.2121120","url":null,"abstract":"What exciting times we are living in! Our ability to measure, model, predict, and influence the thermophysical properties of materials at the microand nanoscale is now enabling exciting new advances with potential positive impacts in many important areas such energy, environment, information, medicine, and transportation. This journal, which was begun in 1997 by my post-doctoral advisor, Chang-Lin Tien, under the title “Microscale Thermophysical Engineering” was established at the very beginning of the nanotechnology revolution and it has always been a forum for thought leadership.","PeriodicalId":49784,"journal":{"name":"Nanoscale and Microscale Thermophysical Engineering","volume":"26 1","pages":"83 - 83"},"PeriodicalIF":4.1,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48848366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-17DOI: 10.1080/15567265.2022.2072790
Ali Reza Alizadeh Jajarm, H. Goshayeshi, K. Bashirnezhad
ABSTRACT In this research, the thermal performance of a three-dimensional pulsating heat pipe with 11 turns is investigated experimentally. Carboxyl-functionalized multi-walled carbon nanotubes with 0.1 wt% in a water-based fluid are used as the operating fluid. Experiments are performed at 50% and 60% filling ratios, and the effect of grooving the evaporator tubes has also been investigated. Experiments with distilled water were also performed to compare the effect of the nanofluid. Experimental results show that the heat transfer performance of the device depends mainly on the power input and the filling ratio, working fluid, and also, the corrugated evaporator that significantly improves the thermal performance. The use of nanofluids reduces the thermal resistance by about 13% compared to pure water at a filling ratio of 50%, and an input power of 300 watts. At a filling ratio of 60%, and the use of nanofluid, corrugating the evaporator reduces the thermal resistance by 6% in comparison with non-corrugated tubes. In general, and in all cases, with increasing input power, the thermal resistance also decreases.
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