Numerical modelling of radiative heat transfer in a polydispersion of ceramic particles under direct high-flux solar irradiation
- Chen, Jingjing, Kumar, Apurv, Coventry, Joe, Kim, Jin-Soo, Lipiński, Wojciech
- Authors: Chen, Jingjing , Kumar, Apurv , Coventry, Joe , Kim, Jin-Soo , Lipiński, Wojciech
- Date: 2022
- Type: Text , Journal article
- Relation: Journal of Quantitative Spectroscopy and Radiative Transfer Vol. 278, no. (2022), p.
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- Description: The effects of polydispersity on radiative and interfacial convective heat transfer are investigated in particle–gas two-phase media for solar particle receiver applications. Non-grey radiative transfer is analysed using the collision-based Monte Carlo ray-tracing method. The Mie theory is employed to calculate radiative properties of particles. The finite volume method and the explicit Euler time integration scheme are used to solve the transient energy equations for the particle and gas phases. Three alternative approaches to modelling particle properties and thermal conditions are employed: (i) a novel discrete size model, in which particle groups within discrete size intervals are assigned individual properties and temperatures locally; (ii) a lumped size model, in which integral properties and a single temperature are assigned to the particle phase locally; and (iii) a monodisperse size model, in which properties are evaluated for the Sauter mean diameter of the polydispersion and a single temperature is assigned to the particle phase locally. Strongly size-dependent radiation absorption and interfacial convective heat transfer are predicted with the discrete size model for alumina particles. Particles smaller than 27.4μm located near the aperture absorb the solar irradiation and transfer heat to the gas phase most effectively. The angular spread of the incident solar radiation is found to have a negligible effect on the overall absorption, although the most uniform thermal conditions occur for the solar irradiation with the smallest confinement angle. The overall absorptance of alumina particles is higher by 3.4% and 2.7% than that of iron (III) oxide and mullite particles, respectively. The lumped and monodisperse size models allow for reduction of the computational time at the expense of lower accuracy and limited information about particle properties and thermal conditions. © 2021 The Author(s)
- Authors: Chen, Jingjing , Kumar, Apurv , Coventry, Joe , Kim, Jin-Soo , Lipiński, Wojciech
- Date: 2022
- Type: Text , Journal article
- Relation: Journal of Quantitative Spectroscopy and Radiative Transfer Vol. 278, no. (2022), p.
- Full Text:
- Reviewed:
- Description: The effects of polydispersity on radiative and interfacial convective heat transfer are investigated in particle–gas two-phase media for solar particle receiver applications. Non-grey radiative transfer is analysed using the collision-based Monte Carlo ray-tracing method. The Mie theory is employed to calculate radiative properties of particles. The finite volume method and the explicit Euler time integration scheme are used to solve the transient energy equations for the particle and gas phases. Three alternative approaches to modelling particle properties and thermal conditions are employed: (i) a novel discrete size model, in which particle groups within discrete size intervals are assigned individual properties and temperatures locally; (ii) a lumped size model, in which integral properties and a single temperature are assigned to the particle phase locally; and (iii) a monodisperse size model, in which properties are evaluated for the Sauter mean diameter of the polydispersion and a single temperature is assigned to the particle phase locally. Strongly size-dependent radiation absorption and interfacial convective heat transfer are predicted with the discrete size model for alumina particles. Particles smaller than 27.4μm located near the aperture absorb the solar irradiation and transfer heat to the gas phase most effectively. The angular spread of the incident solar radiation is found to have a negligible effect on the overall absorption, although the most uniform thermal conditions occur for the solar irradiation with the smallest confinement angle. The overall absorptance of alumina particles is higher by 3.4% and 2.7% than that of iron (III) oxide and mullite particles, respectively. The lumped and monodisperse size models allow for reduction of the computational time at the expense of lower accuracy and limited information about particle properties and thermal conditions. © 2021 The Author(s)
Progress in heat transfer research for high-temperature solar thermal applications
- Lipiński, Wojciech, Abbasi-Shavazi, Ehsan, Chen,Jingjinga, Coventry, Joe, Hangi, Morteza, Iyer, Siddharth, Kumar, Apurv, Li, Lifeng, Li,Sha, Pye,John, Torres, Juan, Wang, Bo
- Authors: Lipiński, Wojciech , Abbasi-Shavazi, Ehsan , Chen,Jingjinga , Coventry, Joe , Hangi, Morteza , Iyer, Siddharth , Kumar, Apurv , Li, Lifeng , Li,Sha , Pye,John , Torres, Juan , Wang, Bo
- Date: 2021
- Type: Text , Journal article
- Relation: Applied Thermal Engineering Vol. 184, no. (2021), p.
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- Description: High-temperature solar thermal energy systems make use of concentrated solar radiation to generate electricity, produce chemical fuels, and drive energy-intensive processing of materials. Heat transfer analyses are essential for system design and optimisation. This article reviews the progress, challenges and opportunities in heat transfer research as applied to high-temperature solar thermal and thermochemical energy systems. The topics discussed include fundamentals of concentrated solar energy collection, convective heat transfer in solar receivers, application of liquid metals as heat transfer media, and heat transfer in non-reacting and reacting two-phase solid–gas systems such as particle–gas flows and gas-saturated porous structures. © 2020 Elsevier Ltd.
- Description: High-temperature solar thermal energy systems make use of concentrated solar radiation to generate electricity, produce chemical fuels, and drive energy-intensive processing of materials. Heat transfer analyses are essential for system design and optimisation. This article reviews the progress, challenges and opportunities in heat transfer research as applied to high-temperature solar thermal and thermochemical energy systems. The topics discussed include fundamentals of concentrated solar energy collection, convective heat transfer in solar receivers, application of liquid metals as heat transfer media, and heat transfer in non-reacting and reacting two-phase solid–gas systems such as particle–gas flows and gas-saturated porous structures. © 2020 Elsevier Ltd. **Please note that there are multiple authors for this article therefore only the name of the first 5 including Federation University Australia affiliate “Apurv Kumar" is provided in this record**
Experimental study on the time-dependent dynamic mechanical behaviour of C60 concrete under high-temperatures
- Li, Hong-chao, Liu, Dian-shu, Zhao, Lei, You, Greg, Liang, Shu-feng, Wang, Yu-tao
- Authors: Li, Hong-chao , Liu, Dian-shu , Zhao, Lei , You, Greg , Liang, Shu-feng , Wang, Yu-tao
- Date: 2015
- Type: Text , Journal article
- Relation: Journal of Beijing Institute of Technology (English Edition) Vol. 24, no. 3 (2015), p. 313-320
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- Description: To study the dynamic mechanical behavior of C60 concrete at high temperatures, impact tests under different steady-state temperature fields (100, 200, 300, 400 and 500℃) were conducted under a variety of durations at the corresponding constant high temperature, namely 0, 30, 60, 90 and 120 min, employing split Hopkinson pressure bar (SHPB) system. In addition, the impact tests were also conducted on the specimens cooled from the high temperature to the room temperature and the specimen under room temperature. From the analysis, it is found that C60 concrete has a time-dependent behavior under high-temperature environment. Under 100, 200, 300, 400 and 500℃ steady-state temperature fields respectively, as the duration at the corresponding constant high temperature increases, the dynamic compressive strength and the elastic modulus decrease but the peak strain generally ascends. After cooling to the room temperature, the dynamic compressive strength and the elastic modulus descend as well, but the peak strain increases first and then decreases slightly, when the duration increases. For specimens under and cooled from the high-temperature, as the temperature increases, the dynamic compressive strength and the peak strain raise first and then reduce gradually, and the dynamic compressive strength of specimen under high temperature is higher than that of the specimen cooled from the same high temperature. © 2015, Editorial Department of Journal of Beijing Institute of Technology. All right reserved.
- Authors: Li, Hong-chao , Liu, Dian-shu , Zhao, Lei , You, Greg , Liang, Shu-feng , Wang, Yu-tao
- Date: 2015
- Type: Text , Journal article
- Relation: Journal of Beijing Institute of Technology (English Edition) Vol. 24, no. 3 (2015), p. 313-320
- Full Text:
- Reviewed:
- Description: To study the dynamic mechanical behavior of C60 concrete at high temperatures, impact tests under different steady-state temperature fields (100, 200, 300, 400 and 500℃) were conducted under a variety of durations at the corresponding constant high temperature, namely 0, 30, 60, 90 and 120 min, employing split Hopkinson pressure bar (SHPB) system. In addition, the impact tests were also conducted on the specimens cooled from the high temperature to the room temperature and the specimen under room temperature. From the analysis, it is found that C60 concrete has a time-dependent behavior under high-temperature environment. Under 100, 200, 300, 400 and 500℃ steady-state temperature fields respectively, as the duration at the corresponding constant high temperature increases, the dynamic compressive strength and the elastic modulus decrease but the peak strain generally ascends. After cooling to the room temperature, the dynamic compressive strength and the elastic modulus descend as well, but the peak strain increases first and then decreases slightly, when the duration increases. For specimens under and cooled from the high-temperature, as the temperature increases, the dynamic compressive strength and the peak strain raise first and then reduce gradually, and the dynamic compressive strength of specimen under high temperature is higher than that of the specimen cooled from the same high temperature. © 2015, Editorial Department of Journal of Beijing Institute of Technology. All right reserved.
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