Stability of liquid metal film flow under gradient magnetic field is investigated. Three dimensional numerical simulations on magnetohydrodynamics （MHD） effect of free surface film flow were carried out, with emphas...Stability of liquid metal film flow under gradient magnetic field is investigated. Three dimensional numerical simulations on magnetohydrodynamics （MHD） effect of free surface film flow were carried out, with emphasis on the film thickness variation and its surface stability. Three different MHD phenomena of film flow were observed in the experiment, namely, retardant, rivulet and flat film flow. From our experiment and numerical simulation it can be concluded that flat film flow is a good choice for plasma-facing components （PFCs）展开更多
Geometry sensitivity of magnetohydrodynamics （MHD） duct flow and some ab- normal phenomena deviating from the classical MHD laws were measured in an experimental investigation of the MHD effect of the flow channel i...Geometry sensitivity of magnetohydrodynamics （MHD） duct flow and some ab- normal phenomena deviating from the classical MHD laws were measured in an experimental investigation of the MHD effect of the flow channel inserter （FCI） duct flow. The results showed that the velocity distribution deviated from the M-type profile on the centre-plane of the cross section of the duct with small slots （in short ＂S-duct＂）. The electric potential difference in the duct wall was much lower than that given by the classical electromagnetic laws. The MHD pres- sure drop was much higher than that from the classical magneto-hydrodynamics theory. These results may help us find some new methods to reduce the MHD pressure drop, or explore other potential applications such as flow structure control.展开更多
Up to now, no a real full-cover liquid metal (LM) free surface flow have been successfully used in magnetic fusion devices as MHD instability and unavoidable rivulet flow. Recently, after we carried out a guidable fre...Up to now, no a real full-cover liquid metal (LM) free surface flow have been successfully used in magnetic fusion devices as MHD instability and unavoidable rivulet flow. Recently, after we carried out a guidable free curve-surface flow on theoretically and experimentally, seeking for other way to get a full-cover free surface flow is also in implementing. The superficial layer MHD effect in free surface flow is experimentally observed. After compared and analyzed the characteristic parameters of the free surface flow, the conditions of full-cover free surface flow are found. Meanwhile, the new two parameters of surface cover ratio and rivulet flow index are introduced to characterize the flowing characteristic of the full-cover free surface flow under magnetic field. According to the analysis rule, for different liquid metal, there are the different unique conditions to meet full-cover free surface flow under magnetic field. This may be a way to solve free surface flow major MHD key issue for LM PFCs.展开更多
Cu films were electrodeposited under a magnetic field of 5 T on the Pt disc electrodes with diameters of 3 mm ~ 25 μm.Such magnetoelectrodeposited(MED) Cu films were employed as an electrode,and cyclic voltammograms ...Cu films were electrodeposited under a magnetic field of 5 T on the Pt disc electrodes with diameters of 3 mm ~ 25 μm.Such magnetoelectrodeposited(MED) Cu films were employed as an electrode,and cyclic voltammograms were measured for the electrochemical reactions of an amino acid of alanine.Chiral behavior was observed as oxidation current difference between the enantiomers.Clear magnetoelectrochemical chirality was observed on the micro-disk electrode and on the kinetic-controlled electrode process of alanine.The chiral response was durable for more than 10 cycles of the consecutive voltammetric measurements of the enantiomers.展开更多
Consequent on MHD geometry sensibility phenomena was measured in an accident case;the more detail experiments have been conducted at the liquid metal experimental loop upgrade facility (LMEL-U). The experimental resul...Consequent on MHD geometry sensibility phenomena was measured in an accident case;the more detail experiments have been conducted at the liquid metal experimental loop upgrade facility (LMEL-U). The experimental results indicate that MHD pressure drop can be greatly reduced in the special designed ducts. Base on the experimental data, an innovation channel concept (tentatively called as the secondary flow channel, short in “S-channel”) is addressed as a reducing MHD pressure drop channel for the application of a liquid metal blanket system in fusion reactor. It may be a dawn for solving MHD pressure drop key issue of liquid metal blanket system.展开更多
The present study reports on the growth of calcium phosphate coatings on Ti6Al4V substrate by electrodeposition under high magnetic field.The electrodeposition is conducted by potentiostatic method on horizontal elect...The present study reports on the growth of calcium phosphate coatings on Ti6Al4V substrate by electrodeposition under high magnetic field.The electrodeposition is conducted by potentiostatic method on horizontal electrode whose roughness was modified to reach a value of 3μm.The coatings are obtained from an electrolyte containing calcium nitrate as the Ca^(2+) source and ammonium phosphate as the P source with a Ca/P ratio equal to two.The LNCMI high field continuous magnet in a 170 mm bore with homogeneity of 600.10~6 in I cm^3 has been used.The magnetic field with a magnitude up to 12 T is applied perpendicularly to the electrode surface.The surface morphology and chemical composition of the obtained coatings were characterized by 3D digital microscope and scanning electron microscopy associated with X-ray microanalysis(SEM-EDX).The phase composition was analyzed by X-Ray diffraction.The presence of several crystalline phases comprising octacalcium phosphate and hydroxyapatite is obtained and magnetic field seems to change the relative importance of these phases.The coating morphology changes from belt shape crystallites to needle shape crystallites with high magnetic field superimposition without important modification of Ca/P ratio in the deposit.On the other hand formation of volcano-like structures due to the presence of hydrogen bubbles during deposition is considerably reduced in the presence of magnetic field.展开更多
基金National Natural Science Foundation of China(No.B10275019)
文摘Stability of liquid metal film flow under gradient magnetic field is investigated. Three dimensional numerical simulations on magnetohydrodynamics （MHD） effect of free surface film flow were carried out, with emphasis on the film thickness variation and its surface stability. Three different MHD phenomena of film flow were observed in the experiment, namely, retardant, rivulet and flat film flow. From our experiment and numerical simulation it can be concluded that flat film flow is a good choice for plasma-facing components （PFCs）
基金supported by National Natural Science Foundation of China (No.10775042)
文摘Geometry sensitivity of magnetohydrodynamics （MHD） duct flow and some ab- normal phenomena deviating from the classical MHD laws were measured in an experimental investigation of the MHD effect of the flow channel inserter （FCI） duct flow. The results showed that the velocity distribution deviated from the M-type profile on the centre-plane of the cross section of the duct with small slots （in short ＂S-duct＂）. The electric potential difference in the duct wall was much lower than that given by the classical electromagnetic laws. The MHD pres- sure drop was much higher than that from the classical magneto-hydrodynamics theory. These results may help us find some new methods to reduce the MHD pressure drop, or explore other potential applications such as flow structure control.
文摘Up to now, no a real full-cover liquid metal (LM) free surface flow have been successfully used in magnetic fusion devices as MHD instability and unavoidable rivulet flow. Recently, after we carried out a guidable free curve-surface flow on theoretically and experimentally, seeking for other way to get a full-cover free surface flow is also in implementing. The superficial layer MHD effect in free surface flow is experimentally observed. After compared and analyzed the characteristic parameters of the free surface flow, the conditions of full-cover free surface flow are found. Meanwhile, the new two parameters of surface cover ratio and rivulet flow index are introduced to characterize the flowing characteristic of the full-cover free surface flow under magnetic field. According to the analysis rule, for different liquid metal, there are the different unique conditions to meet full-cover free surface flow under magnetic field. This may be a way to solve free surface flow major MHD key issue for LM PFCs.
文摘Cu films were electrodeposited under a magnetic field of 5 T on the Pt disc electrodes with diameters of 3 mm ~ 25 μm.Such magnetoelectrodeposited(MED) Cu films were employed as an electrode,and cyclic voltammograms were measured for the electrochemical reactions of an amino acid of alanine.Chiral behavior was observed as oxidation current difference between the enantiomers.Clear magnetoelectrochemical chirality was observed on the micro-disk electrode and on the kinetic-controlled electrode process of alanine.The chiral response was durable for more than 10 cycles of the consecutive voltammetric measurements of the enantiomers.
文摘Consequent on MHD geometry sensibility phenomena was measured in an accident case;the more detail experiments have been conducted at the liquid metal experimental loop upgrade facility (LMEL-U). The experimental results indicate that MHD pressure drop can be greatly reduced in the special designed ducts. Base on the experimental data, an innovation channel concept (tentatively called as the secondary flow channel, short in “S-channel”) is addressed as a reducing MHD pressure drop channel for the application of a liquid metal blanket system in fusion reactor. It may be a dawn for solving MHD pressure drop key issue of liquid metal blanket system.
文摘The present study reports on the growth of calcium phosphate coatings on Ti6Al4V substrate by electrodeposition under high magnetic field.The electrodeposition is conducted by potentiostatic method on horizontal electrode whose roughness was modified to reach a value of 3μm.The coatings are obtained from an electrolyte containing calcium nitrate as the Ca^(2+) source and ammonium phosphate as the P source with a Ca/P ratio equal to two.The LNCMI high field continuous magnet in a 170 mm bore with homogeneity of 600.10~6 in I cm^3 has been used.The magnetic field with a magnitude up to 12 T is applied perpendicularly to the electrode surface.The surface morphology and chemical composition of the obtained coatings were characterized by 3D digital microscope and scanning electron microscopy associated with X-ray microanalysis(SEM-EDX).The phase composition was analyzed by X-Ray diffraction.The presence of several crystalline phases comprising octacalcium phosphate and hydroxyapatite is obtained and magnetic field seems to change the relative importance of these phases.The coating morphology changes from belt shape crystallites to needle shape crystallites with high magnetic field superimposition without important modification of Ca/P ratio in the deposit.On the other hand formation of volcano-like structures due to the presence of hydrogen bubbles during deposition is considerably reduced in the presence of magnetic field.
