The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Jian Zhao - One of the best experts on this subject based on the ideXlab platform.
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Research on heat Transfer Characteristic of crude oil during the tubular heating process in the floating roof tank
Case Studies in Thermal Engineering, 2017Co-Authors: Jian Zhao, Hang Dong, Xiulian Wang, Xiaoming FuAbstract:Abstract By means of finite volume method, the heat Transfer Characteristic of crude oil under the tubular heating in the floating roof tank is investigated by numerical simulation. The evolution of temperature profile and its relationship with the flow pattern is presented in detail. A noticeable finding is that there exists the transformation of the flow pattern which affects the temperature profile apparently during the heating process. Special concern is taken on the evolution of temperature distribution on the interface between oil and the inner wall of the tank. The temperature profile on the top wall, sidewall and base wall of the tank is investigated. It is concluded that the plume induced by natural convection takes most responsibility for the formation of temperature field in the tank. The second factor is the boundary condition of the tank.
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Research on heat Transfer Characteristic of waxy crude oil during the gelatinization process in the floating roof tank
International Journal of Thermal Sciences, 2017Co-Authors: Jian Zhao, Hang DongAbstract:Abstract By means of additional specific heat capacity and momentum source terms methods, the heat Transfer Characteristic of waxy crude oil during the gelatinization process in the floating roof tank is investigated by numerical simulation. A new kind of division method for the cooling based on the heat Transfer mechanism and behavior is proposed. Special concern is taken on the evolution of gelatinization structure and its relationship with the temperature profile. The gelatinous crude oil first generates in the bottom corner of the tank, and there is always the position where the thickest gelatinization layer locates. The integrated gelatinization layer first generates on the top wall, and then it covers the sidewall. The gelatinization interface is not a plane and variates as the cooling proceeds. The temperature profile is constituted by three low temperature regions near walls and a high temperature region in the center of the tank. Moreover, the evolution of temperature profile, positions with the maximal and minimal temperature, as well as the heat Transfer coefficient near walls is illustrated in detail. In addition, the effect from environment temperature and oil property on the gelatinization process is also discussed.
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research on heat Transfer Characteristic of waxy crude oil after oil pipeline shutdown
Journal of Thermal Analysis and Calorimetry, 2017Co-Authors: Jian Zhao, Hang Dong, Lixin Wei, Gang ZhouAbstract:By means of additional specific heat capacity and momentum source term methods, the heat Transfer Characteristic of waxy crude oil after pipeline shutdown is investigated by the numerical simulation. Comparing to the previous research, some new findings are obtained. New division method for the cooling process according to the heat Transfer behavior of oil is proposed. Special concern is taken on the gelation process of waxy crude oil. The gelled crude oil first appears on the bottom of the pipe. And then the gelation interface gradually changes from ellipse shape into the concentric circle shape. The evolution of heat Transfer coefficient of the inner wall is different during the cooling process. Therefore, the forecast of heat Transfer coefficient should follow different mathematical formulation. Heat conduction is the driving force for the movement of gelation interface and the determinant for the temperature gradient in the pipe. The smooth temperature gradient brings about the integral gelation of waxy crude oil. On this condition, the gelled crude oil has more powerful structural strength. The variation of oil viscosity has the limited effect on the cooling rate of oil. As the cooling process proceeds, heat convection continues to weakening. Thus, the effect of oil viscosity on the heat Transfer gradually decreases.
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research on heat Transfer Characteristic for hot oil spraying heating process in crude oil tank
Case Studies in Thermal Engineering, 2016Co-Authors: Jian Zhao, Hang Dong, Lixin Wei, Fengrong LiuAbstract:The finite volume method and standard k−ek−e turbulence model are used to numerically investigate the heat Transfer features of crude oil inside the floating roof tank under the hot oil spraying heating mode. The results indicate that this heat Transfer process has the essential features of the thermal buoyancy jet flow. The jet flow is divided into the strong buoyancy, weak buoyancy and common buoyancy process according to Froude number of the jet flow. Bigger Froude number of the jet flow indicates stronger heat exchange strength and more uniform distribution of oil temperature. Smaller Froude number indicates stronger buoyancy, weaker heat exchange strength and more obvious hierarchical distribution feature of the oil temperature inside the tank. Two indices (efficiency and uniformity) are introduced and examined which could be of practical usage. According to the simulated result, higher nozzle speed and proper spraying temperature which results in a lager Froude number can achieve better heating effect by taking two previous indices as evaluation criterion. For the practical engineering usage, the spraying temperature and nozzle speed should be adjusted synchronously based on Froude number.
Hang Dong - One of the best experts on this subject based on the ideXlab platform.
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Research on heat Transfer Characteristic of crude oil during the tubular heating process in the floating roof tank
Case Studies in Thermal Engineering, 2017Co-Authors: Jian Zhao, Hang Dong, Xiulian Wang, Xiaoming FuAbstract:Abstract By means of finite volume method, the heat Transfer Characteristic of crude oil under the tubular heating in the floating roof tank is investigated by numerical simulation. The evolution of temperature profile and its relationship with the flow pattern is presented in detail. A noticeable finding is that there exists the transformation of the flow pattern which affects the temperature profile apparently during the heating process. Special concern is taken on the evolution of temperature distribution on the interface between oil and the inner wall of the tank. The temperature profile on the top wall, sidewall and base wall of the tank is investigated. It is concluded that the plume induced by natural convection takes most responsibility for the formation of temperature field in the tank. The second factor is the boundary condition of the tank.
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Research on heat Transfer Characteristic of waxy crude oil during the gelatinization process in the floating roof tank
International Journal of Thermal Sciences, 2017Co-Authors: Jian Zhao, Hang DongAbstract:Abstract By means of additional specific heat capacity and momentum source terms methods, the heat Transfer Characteristic of waxy crude oil during the gelatinization process in the floating roof tank is investigated by numerical simulation. A new kind of division method for the cooling based on the heat Transfer mechanism and behavior is proposed. Special concern is taken on the evolution of gelatinization structure and its relationship with the temperature profile. The gelatinous crude oil first generates in the bottom corner of the tank, and there is always the position where the thickest gelatinization layer locates. The integrated gelatinization layer first generates on the top wall, and then it covers the sidewall. The gelatinization interface is not a plane and variates as the cooling proceeds. The temperature profile is constituted by three low temperature regions near walls and a high temperature region in the center of the tank. Moreover, the evolution of temperature profile, positions with the maximal and minimal temperature, as well as the heat Transfer coefficient near walls is illustrated in detail. In addition, the effect from environment temperature and oil property on the gelatinization process is also discussed.
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research on heat Transfer Characteristic of waxy crude oil after oil pipeline shutdown
Journal of Thermal Analysis and Calorimetry, 2017Co-Authors: Jian Zhao, Hang Dong, Lixin Wei, Gang ZhouAbstract:By means of additional specific heat capacity and momentum source term methods, the heat Transfer Characteristic of waxy crude oil after pipeline shutdown is investigated by the numerical simulation. Comparing to the previous research, some new findings are obtained. New division method for the cooling process according to the heat Transfer behavior of oil is proposed. Special concern is taken on the gelation process of waxy crude oil. The gelled crude oil first appears on the bottom of the pipe. And then the gelation interface gradually changes from ellipse shape into the concentric circle shape. The evolution of heat Transfer coefficient of the inner wall is different during the cooling process. Therefore, the forecast of heat Transfer coefficient should follow different mathematical formulation. Heat conduction is the driving force for the movement of gelation interface and the determinant for the temperature gradient in the pipe. The smooth temperature gradient brings about the integral gelation of waxy crude oil. On this condition, the gelled crude oil has more powerful structural strength. The variation of oil viscosity has the limited effect on the cooling rate of oil. As the cooling process proceeds, heat convection continues to weakening. Thus, the effect of oil viscosity on the heat Transfer gradually decreases.
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research on heat Transfer Characteristic for hot oil spraying heating process in crude oil tank
Case Studies in Thermal Engineering, 2016Co-Authors: Jian Zhao, Hang Dong, Lixin Wei, Fengrong LiuAbstract:The finite volume method and standard k−ek−e turbulence model are used to numerically investigate the heat Transfer features of crude oil inside the floating roof tank under the hot oil spraying heating mode. The results indicate that this heat Transfer process has the essential features of the thermal buoyancy jet flow. The jet flow is divided into the strong buoyancy, weak buoyancy and common buoyancy process according to Froude number of the jet flow. Bigger Froude number of the jet flow indicates stronger heat exchange strength and more uniform distribution of oil temperature. Smaller Froude number indicates stronger buoyancy, weaker heat exchange strength and more obvious hierarchical distribution feature of the oil temperature inside the tank. Two indices (efficiency and uniformity) are introduced and examined which could be of practical usage. According to the simulated result, higher nozzle speed and proper spraying temperature which results in a lager Froude number can achieve better heating effect by taking two previous indices as evaluation criterion. For the practical engineering usage, the spraying temperature and nozzle speed should be adjusted synchronously based on Froude number.
Gang Zhou - One of the best experts on this subject based on the ideXlab platform.
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research on heat Transfer Characteristic of waxy crude oil after oil pipeline shutdown
Journal of Thermal Analysis and Calorimetry, 2017Co-Authors: Jian Zhao, Hang Dong, Lixin Wei, Gang ZhouAbstract:By means of additional specific heat capacity and momentum source term methods, the heat Transfer Characteristic of waxy crude oil after pipeline shutdown is investigated by the numerical simulation. Comparing to the previous research, some new findings are obtained. New division method for the cooling process according to the heat Transfer behavior of oil is proposed. Special concern is taken on the gelation process of waxy crude oil. The gelled crude oil first appears on the bottom of the pipe. And then the gelation interface gradually changes from ellipse shape into the concentric circle shape. The evolution of heat Transfer coefficient of the inner wall is different during the cooling process. Therefore, the forecast of heat Transfer coefficient should follow different mathematical formulation. Heat conduction is the driving force for the movement of gelation interface and the determinant for the temperature gradient in the pipe. The smooth temperature gradient brings about the integral gelation of waxy crude oil. On this condition, the gelled crude oil has more powerful structural strength. The variation of oil viscosity has the limited effect on the cooling rate of oil. As the cooling process proceeds, heat convection continues to weakening. Thus, the effect of oil viscosity on the heat Transfer gradually decreases.
Lixin Wei - One of the best experts on this subject based on the ideXlab platform.
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research on heat Transfer Characteristic of waxy crude oil after oil pipeline shutdown
Journal of Thermal Analysis and Calorimetry, 2017Co-Authors: Jian Zhao, Hang Dong, Lixin Wei, Gang ZhouAbstract:By means of additional specific heat capacity and momentum source term methods, the heat Transfer Characteristic of waxy crude oil after pipeline shutdown is investigated by the numerical simulation. Comparing to the previous research, some new findings are obtained. New division method for the cooling process according to the heat Transfer behavior of oil is proposed. Special concern is taken on the gelation process of waxy crude oil. The gelled crude oil first appears on the bottom of the pipe. And then the gelation interface gradually changes from ellipse shape into the concentric circle shape. The evolution of heat Transfer coefficient of the inner wall is different during the cooling process. Therefore, the forecast of heat Transfer coefficient should follow different mathematical formulation. Heat conduction is the driving force for the movement of gelation interface and the determinant for the temperature gradient in the pipe. The smooth temperature gradient brings about the integral gelation of waxy crude oil. On this condition, the gelled crude oil has more powerful structural strength. The variation of oil viscosity has the limited effect on the cooling rate of oil. As the cooling process proceeds, heat convection continues to weakening. Thus, the effect of oil viscosity on the heat Transfer gradually decreases.
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research on heat Transfer Characteristic for hot oil spraying heating process in crude oil tank
Case Studies in Thermal Engineering, 2016Co-Authors: Jian Zhao, Hang Dong, Lixin Wei, Fengrong LiuAbstract:The finite volume method and standard k−ek−e turbulence model are used to numerically investigate the heat Transfer features of crude oil inside the floating roof tank under the hot oil spraying heating mode. The results indicate that this heat Transfer process has the essential features of the thermal buoyancy jet flow. The jet flow is divided into the strong buoyancy, weak buoyancy and common buoyancy process according to Froude number of the jet flow. Bigger Froude number of the jet flow indicates stronger heat exchange strength and more uniform distribution of oil temperature. Smaller Froude number indicates stronger buoyancy, weaker heat exchange strength and more obvious hierarchical distribution feature of the oil temperature inside the tank. Two indices (efficiency and uniformity) are introduced and examined which could be of practical usage. According to the simulated result, higher nozzle speed and proper spraying temperature which results in a lager Froude number can achieve better heating effect by taking two previous indices as evaluation criterion. For the practical engineering usage, the spraying temperature and nozzle speed should be adjusted synchronously based on Froude number.
Xiaoming Fu - One of the best experts on this subject based on the ideXlab platform.
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Research on heat Transfer Characteristic of crude oil during the tubular heating process in the floating roof tank
Case Studies in Thermal Engineering, 2017Co-Authors: Jian Zhao, Hang Dong, Xiulian Wang, Xiaoming FuAbstract:Abstract By means of finite volume method, the heat Transfer Characteristic of crude oil under the tubular heating in the floating roof tank is investigated by numerical simulation. The evolution of temperature profile and its relationship with the flow pattern is presented in detail. A noticeable finding is that there exists the transformation of the flow pattern which affects the temperature profile apparently during the heating process. Special concern is taken on the evolution of temperature distribution on the interface between oil and the inner wall of the tank. The temperature profile on the top wall, sidewall and base wall of the tank is investigated. It is concluded that the plume induced by natural convection takes most responsibility for the formation of temperature field in the tank. The second factor is the boundary condition of the tank.
