This study aimed at quantitatively evaluating the sugarcane losses and the damage caused to the ratoon cane while using the Case IH A8800 harvester in different displacement speeds;it was conducted in the municipality...This study aimed at quantitatively evaluating the sugarcane losses and the damage caused to the ratoon cane while using the Case IH A8800 harvester in different displacement speeds;it was conducted in the municipality of Campos dos Goytacazes, in Rio de Janeiro, Brazil. Three speeds were used as treatment (2 km·h-1, 3 km·h-1, and 4.5 km·h-1), and each treatment was composed of six rows of harvested ratoon, each with a length of 290 m. In order to evaluate the quantitative losses in t·ha-1 and the percentage of losses, the remaining sugarcane, left on the field after harvesting, was collected. The sampling frame was set to every 50 m, dividing the borders by 40 m;the measurement for each sampling area was of 20 m2, with five repetitions. In order to evaluate the damage caused to the ratoon canes, we chose a visual methodology to classify the damage degrees, ranging from one to four. There was no significant difference in losses when comparing different speeds. Therefore, it is more advantageous and economically viable to use the speed of 4.5 km·h-1, which collects more in less time.展开更多
The pore-scale mechanism of the waterflooding contributes to enhancing oil recovery,which has been widely emphasized in the petroleum industry.In this paper,the performances and accuracy of three tracking interface al...The pore-scale mechanism of the waterflooding contributes to enhancing oil recovery,which has been widely emphasized in the petroleum industry.In this paper,the performances and accuracy of three tracking interface algorithms,including VOF,LS,and VOSET,are compared and analyzed through twophase flow in the conceptual model of pore-throat.The results show that the VOSET method combines the advantages of the other two methods,which not only satisfies the mass conservation but also improves the continuity of the physical quantities near the interface.Then,based on the binary image of the pore,the two-dimensional micro pore model is reconstructed by extracting image contour.The grid independence of the reconstructed pore model is verified by the single-phase flow simulation.The waterflooding process in the reconstructed pore model is simulated using the VOSET method,and the effects of displacement speed and wettability on the oil recovery are analyzed.The morphologies of residual oil under different conditions of wettability are investigated and analyzed.The study provides a basic theory for modeling the pore-scale oil-water flow and optimizing the scheme of the water injection.展开更多
文摘This study aimed at quantitatively evaluating the sugarcane losses and the damage caused to the ratoon cane while using the Case IH A8800 harvester in different displacement speeds;it was conducted in the municipality of Campos dos Goytacazes, in Rio de Janeiro, Brazil. Three speeds were used as treatment (2 km·h-1, 3 km·h-1, and 4.5 km·h-1), and each treatment was composed of six rows of harvested ratoon, each with a length of 290 m. In order to evaluate the quantitative losses in t·ha-1 and the percentage of losses, the remaining sugarcane, left on the field after harvesting, was collected. The sampling frame was set to every 50 m, dividing the borders by 40 m;the measurement for each sampling area was of 20 m2, with five repetitions. In order to evaluate the damage caused to the ratoon canes, we chose a visual methodology to classify the damage degrees, ranging from one to four. There was no significant difference in losses when comparing different speeds. Therefore, it is more advantageous and economically viable to use the speed of 4.5 km·h-1, which collects more in less time.
基金by the National Natural Science Foundation of China(Grant Number 51909225)National Major Science and Technology Projects of China(Grant Number 2017ZX05013001-002)Open research fund of CNPC(grant No.2018A-0908),and the Natural Science Foundation of SWUST(Grant Number 20zx7129).
文摘The pore-scale mechanism of the waterflooding contributes to enhancing oil recovery,which has been widely emphasized in the petroleum industry.In this paper,the performances and accuracy of three tracking interface algorithms,including VOF,LS,and VOSET,are compared and analyzed through twophase flow in the conceptual model of pore-throat.The results show that the VOSET method combines the advantages of the other two methods,which not only satisfies the mass conservation but also improves the continuity of the physical quantities near the interface.Then,based on the binary image of the pore,the two-dimensional micro pore model is reconstructed by extracting image contour.The grid independence of the reconstructed pore model is verified by the single-phase flow simulation.The waterflooding process in the reconstructed pore model is simulated using the VOSET method,and the effects of displacement speed and wettability on the oil recovery are analyzed.The morphologies of residual oil under different conditions of wettability are investigated and analyzed.The study provides a basic theory for modeling the pore-scale oil-water flow and optimizing the scheme of the water injection.
