Slag movement on SiO2-based prism refractories in different slag systems was observed. The cross section shape evolution mechanism was discussed. Two types of shape evolution appear. For PbO-SiO2 slag whose surface te...Slag movement on SiO2-based prism refractories in different slag systems was observed. The cross section shape evolution mechanism was discussed. Two types of shape evolution appear. For PbO-SiO2 slag whose surface tension improves with SiO2 concentration, slag film flows up along four edges under axial Marangoni shear force and wettability. Then, it flows down along four lateral faces under gravity. Corrosion rate at edges is larger than that on lateral faces due to different SiO2 solubilities of ascending and descending flow. Prism cross section shape changes from square to round. For FetO-SiO2 slag whose surface tension reduces with the increase of SiO2 concentration, slag film flows up under the inflence of wettability. Then, it flows down under Marangoni shear force and gravity. Compared to four edges, slag is mainly up and down on four lateral faces due to larger surface tension and size. So, prism cross section shape keeps square.展开更多
The wind fetch effect is important to wind erosion and aeolian transport and controls aeolian flux.It is useful to study the wind fetch effect in determining the aeolian transport mechanism and improving our knowledge...The wind fetch effect is important to wind erosion and aeolian transport and controls aeolian flux.It is useful to study the wind fetch effect in determining the aeolian transport mechanism and improving our knowledge of aeolian physics and wind erosion.In this paper,multichannel samplers measure aeolian transport at different heights above an artificial Gobi surface in the southeastern region of the Tengger Desert.The results show that aeolian transport flux can be expressed as an exponential function of height.Wind fetch obviously affects aeolian flux and aeolian transport.The coefficients and relative decay rate of aeolian flux decrease and then increase with increasing wind fetch distance.Aeolian transport depends on the height and fetch distance;aeolian transport increases and then decreases with increasing fetch distance,reaching a maximum at a fetch distance of about 34 m at the very near surface.The fetch distance of maximum aeolian transport tends to increase with height.展开更多
基金Projects(U1738101,51804023)supported by the National Natural Science Foundation of ChinaProjects(FRF-TP-18-007A1,FRF-MP-18-007)supported by Fundamental Research Funds for the Central Universities,ChinaProject(2019M650489)supported by China Postdoctoral Science Foundation
文摘Slag movement on SiO2-based prism refractories in different slag systems was observed. The cross section shape evolution mechanism was discussed. Two types of shape evolution appear. For PbO-SiO2 slag whose surface tension improves with SiO2 concentration, slag film flows up along four edges under axial Marangoni shear force and wettability. Then, it flows down along four lateral faces under gravity. Corrosion rate at edges is larger than that on lateral faces due to different SiO2 solubilities of ascending and descending flow. Prism cross section shape changes from square to round. For FetO-SiO2 slag whose surface tension reduces with the increase of SiO2 concentration, slag film flows up under the inflence of wettability. Then, it flows down under Marangoni shear force and gravity. Compared to four edges, slag is mainly up and down on four lateral faces due to larger surface tension and size. So, prism cross section shape keeps square.
基金supported by the National Natural Science Foundation of China (Grant Nos.41101007,41130533 and 41171010)
文摘The wind fetch effect is important to wind erosion and aeolian transport and controls aeolian flux.It is useful to study the wind fetch effect in determining the aeolian transport mechanism and improving our knowledge of aeolian physics and wind erosion.In this paper,multichannel samplers measure aeolian transport at different heights above an artificial Gobi surface in the southeastern region of the Tengger Desert.The results show that aeolian transport flux can be expressed as an exponential function of height.Wind fetch obviously affects aeolian flux and aeolian transport.The coefficients and relative decay rate of aeolian flux decrease and then increase with increasing wind fetch distance.Aeolian transport depends on the height and fetch distance;aeolian transport increases and then decreases with increasing fetch distance,reaching a maximum at a fetch distance of about 34 m at the very near surface.The fetch distance of maximum aeolian transport tends to increase with height.
