The Experts below are selected from a list of 79470 Experts worldwide ranked by ideXlab platform
Min Wang - One of the best experts on this subject based on the ideXlab platform.
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Temperature Drop and gelatinization characteristics of waxy crude oil in 1000 m3 single and double plate floating roof oil tanks during storage
International Journal of Heat and Mass Transfer, 2019Co-Authors: Min Wang, Qianqian Shao, Jingfa Li, Xinyu Zhang, Bo YuAbstract:Abstract Single and double-plate floating roof oil tanks are two types of widely used floating roof oil tanks in petrochemical industry. However, the differences in flow and hear transfer characteristics of waxy crude oil inside these two tanks have been studied insufficiently. Finite volume method is employed in this research to study the Temperature Drop and gelatinization processes of waxy crude oil as well as the differences in single and double-plate floating roof tanks. Based on a comprehensive consideration of the atmosphere, soil, floating roof oil tank as well as the tank structure and the variations of the waxy crude oil state and rheological behavior, general physical and mathematical models are established. In the model, wax precipitation and gelatinization processes of waxy crude oil are described by the enthalpy-porous media method. Non-Newtonian behavior is described by the Power law equation. Turbulent natural convection is described by the LES method. SIMPLE algorithm is employed to couple pressure and velocity. Taking 1000 m3 single and double-plate floating roof oil tanks as examples, the evolution of oil Temperature and flow behavior is studied and the variations of the gel oil thickness and heat flux are analyzed. Moreover, the differences between these two tanks are also discussed. Results show that due to the structure difference of the tank roof, the Temperature Drop rates are 0.018 °C/h and 0.007 °C/h respectively in single and double-plate floating roof tanks in the case of this research. Secondly, for the growth of gel oil on tank bottom, in double-plate floating roof tank, gel oil thickness keeps growing and fluctuating, while in single-plate tank, the original gelled oil layer disappears firstly and then increases gradually. Thirdly, although for both tanks, tank roof is the main part of heat dissipation towards the atmosphere, the maximum heat fluxes are respectively over 2.0 kW and 0.4 kW for single and double-plate floating roof tanks, and the total average heat fluxes respectively are 1.49 kW and 0.59 kW.
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numerical study on the Temperature Drop characteristics of waxy crude oil in a double plate floating roof oil tank
Applied Thermal Engineering, 2017Co-Authors: Min Wang, Xinyu Zhang, Dongliang SunAbstract:Abstract Physical and mathematical models for the Temperature Drop process of the waxy crude oil in a double-plate floating roof oil tank are established with the consideration of non-Newtonian behavior and wax precipitation accompanying the phase change of waxy crude oil. Accordingly, an integrative numerical procedure is developed for the calculation. In this study, non-Newtonian behavior is described by power-law equation. Wax precipitation is described by the enthalpy-porous media theory, in which the gel oil interface is tracked. The computer code is validated by the results in literatures. Based on the verified computer code, characteristics of Temperature Drop in the tank are studied and the influences of wax precipitation amount and non-Newtonian behavior on the Temperature Drop process are analyzed in detail. The results show that when oil is not gelled, the oil tank can be divided into two parts: (1) the top and middle part of approximate uniform Temperature; (2) the bottom part of stratified distribution of Temperature. It is also found that increasing of the wax precipitation amount will slow down the Temperature Drop process and extend the duration of the temporal stable period. Furthermore, when oil Temperature is between abnormal point and thixotropy appearance point, whether considering the non-Newtonian behavior or not covers certain influence on Temperature Drop process, and different non-Newtonian behaviors play less effect. When oil Temperature is below thixotropy appearance point, strengthening of the non-Newtonian behavior will slow down the Temperature Drop process slightly.
Bo Yu - One of the best experts on this subject based on the ideXlab platform.
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Temperature Drop and gelatinization characteristics of waxy crude oil in 1000 m3 single and double plate floating roof oil tanks during storage
International Journal of Heat and Mass Transfer, 2019Co-Authors: Min Wang, Qianqian Shao, Jingfa Li, Xinyu Zhang, Bo YuAbstract:Abstract Single and double-plate floating roof oil tanks are two types of widely used floating roof oil tanks in petrochemical industry. However, the differences in flow and hear transfer characteristics of waxy crude oil inside these two tanks have been studied insufficiently. Finite volume method is employed in this research to study the Temperature Drop and gelatinization processes of waxy crude oil as well as the differences in single and double-plate floating roof tanks. Based on a comprehensive consideration of the atmosphere, soil, floating roof oil tank as well as the tank structure and the variations of the waxy crude oil state and rheological behavior, general physical and mathematical models are established. In the model, wax precipitation and gelatinization processes of waxy crude oil are described by the enthalpy-porous media method. Non-Newtonian behavior is described by the Power law equation. Turbulent natural convection is described by the LES method. SIMPLE algorithm is employed to couple pressure and velocity. Taking 1000 m3 single and double-plate floating roof oil tanks as examples, the evolution of oil Temperature and flow behavior is studied and the variations of the gel oil thickness and heat flux are analyzed. Moreover, the differences between these two tanks are also discussed. Results show that due to the structure difference of the tank roof, the Temperature Drop rates are 0.018 °C/h and 0.007 °C/h respectively in single and double-plate floating roof tanks in the case of this research. Secondly, for the growth of gel oil on tank bottom, in double-plate floating roof tank, gel oil thickness keeps growing and fluctuating, while in single-plate tank, the original gelled oil layer disappears firstly and then increases gradually. Thirdly, although for both tanks, tank roof is the main part of heat dissipation towards the atmosphere, the maximum heat fluxes are respectively over 2.0 kW and 0.4 kW for single and double-plate floating roof tanks, and the total average heat fluxes respectively are 1.49 kW and 0.59 kW.
Xinyu Zhang - One of the best experts on this subject based on the ideXlab platform.
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Temperature Drop and gelatinization characteristics of waxy crude oil in 1000 m3 single and double plate floating roof oil tanks during storage
International Journal of Heat and Mass Transfer, 2019Co-Authors: Min Wang, Qianqian Shao, Jingfa Li, Xinyu Zhang, Bo YuAbstract:Abstract Single and double-plate floating roof oil tanks are two types of widely used floating roof oil tanks in petrochemical industry. However, the differences in flow and hear transfer characteristics of waxy crude oil inside these two tanks have been studied insufficiently. Finite volume method is employed in this research to study the Temperature Drop and gelatinization processes of waxy crude oil as well as the differences in single and double-plate floating roof tanks. Based on a comprehensive consideration of the atmosphere, soil, floating roof oil tank as well as the tank structure and the variations of the waxy crude oil state and rheological behavior, general physical and mathematical models are established. In the model, wax precipitation and gelatinization processes of waxy crude oil are described by the enthalpy-porous media method. Non-Newtonian behavior is described by the Power law equation. Turbulent natural convection is described by the LES method. SIMPLE algorithm is employed to couple pressure and velocity. Taking 1000 m3 single and double-plate floating roof oil tanks as examples, the evolution of oil Temperature and flow behavior is studied and the variations of the gel oil thickness and heat flux are analyzed. Moreover, the differences between these two tanks are also discussed. Results show that due to the structure difference of the tank roof, the Temperature Drop rates are 0.018 °C/h and 0.007 °C/h respectively in single and double-plate floating roof tanks in the case of this research. Secondly, for the growth of gel oil on tank bottom, in double-plate floating roof tank, gel oil thickness keeps growing and fluctuating, while in single-plate tank, the original gelled oil layer disappears firstly and then increases gradually. Thirdly, although for both tanks, tank roof is the main part of heat dissipation towards the atmosphere, the maximum heat fluxes are respectively over 2.0 kW and 0.4 kW for single and double-plate floating roof tanks, and the total average heat fluxes respectively are 1.49 kW and 0.59 kW.
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numerical study on the Temperature Drop characteristics of waxy crude oil in a double plate floating roof oil tank
Applied Thermal Engineering, 2017Co-Authors: Min Wang, Xinyu Zhang, Dongliang SunAbstract:Abstract Physical and mathematical models for the Temperature Drop process of the waxy crude oil in a double-plate floating roof oil tank are established with the consideration of non-Newtonian behavior and wax precipitation accompanying the phase change of waxy crude oil. Accordingly, an integrative numerical procedure is developed for the calculation. In this study, non-Newtonian behavior is described by power-law equation. Wax precipitation is described by the enthalpy-porous media theory, in which the gel oil interface is tracked. The computer code is validated by the results in literatures. Based on the verified computer code, characteristics of Temperature Drop in the tank are studied and the influences of wax precipitation amount and non-Newtonian behavior on the Temperature Drop process are analyzed in detail. The results show that when oil is not gelled, the oil tank can be divided into two parts: (1) the top and middle part of approximate uniform Temperature; (2) the bottom part of stratified distribution of Temperature. It is also found that increasing of the wax precipitation amount will slow down the Temperature Drop process and extend the duration of the temporal stable period. Furthermore, when oil Temperature is between abnormal point and thixotropy appearance point, whether considering the non-Newtonian behavior or not covers certain influence on Temperature Drop process, and different non-Newtonian behaviors play less effect. When oil Temperature is below thixotropy appearance point, strengthening of the non-Newtonian behavior will slow down the Temperature Drop process slightly.
Aldo Steinfeld - One of the best experts on this subject based on the ideXlab platform.
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design of packed bed thermal energy storage systems for high Temperature industrial process heat
Applied Energy, 2015Co-Authors: Giw Zanganeh, Andrea Pedretti, Andreas Haselbacher, Aldo SteinfeldAbstract:A previously validated quasi-one-dimensional transient two-phase heat transfer model is used to assess the effect of operational and design parameters on the performance of thermocline thermal energy storage (TES) based on a packed bed of rocks and high-Temperature air from process heat as heat transfer fluid. The performance indicators are thermal losses, pumping work, discharge outflow Temperature, and overall storage efficiency. A 7.2GWhth TES unit is used as a baseline design. It is found that initial charging of the TES prior to cyclic operation significantly improves its performance at the expense of additional storage material. The Temperature Drop during the discharge phase is reduced and the efficiency is increased by decreasing the tank diameter-to-height ratio and the rock diameter at the expense of increased pressure Drop and pumping work. Increasing the cone angle results in reduced storage size, but increases the Temperature Drop during discharging. It is shown that thin insulation layers are sufficient to ensure low thermal losses. For all investigated cases, the overall efficiency of the storage stays above 95%.
Dongliang Sun - One of the best experts on this subject based on the ideXlab platform.
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numerical study on the Temperature Drop characteristics of waxy crude oil in a double plate floating roof oil tank
Applied Thermal Engineering, 2017Co-Authors: Min Wang, Xinyu Zhang, Dongliang SunAbstract:Abstract Physical and mathematical models for the Temperature Drop process of the waxy crude oil in a double-plate floating roof oil tank are established with the consideration of non-Newtonian behavior and wax precipitation accompanying the phase change of waxy crude oil. Accordingly, an integrative numerical procedure is developed for the calculation. In this study, non-Newtonian behavior is described by power-law equation. Wax precipitation is described by the enthalpy-porous media theory, in which the gel oil interface is tracked. The computer code is validated by the results in literatures. Based on the verified computer code, characteristics of Temperature Drop in the tank are studied and the influences of wax precipitation amount and non-Newtonian behavior on the Temperature Drop process are analyzed in detail. The results show that when oil is not gelled, the oil tank can be divided into two parts: (1) the top and middle part of approximate uniform Temperature; (2) the bottom part of stratified distribution of Temperature. It is also found that increasing of the wax precipitation amount will slow down the Temperature Drop process and extend the duration of the temporal stable period. Furthermore, when oil Temperature is between abnormal point and thixotropy appearance point, whether considering the non-Newtonian behavior or not covers certain influence on Temperature Drop process, and different non-Newtonian behaviors play less effect. When oil Temperature is below thixotropy appearance point, strengthening of the non-Newtonian behavior will slow down the Temperature Drop process slightly.
