The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform

Shu Yun Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Stability Parameter H of the Flow of Power-Law Fluid in Annulus with the Inner Cylinder Executing a Planetary Motion
    Applied Mechanics and Materials, 2020
    Co-Authors: Shu Yun Zhang
    Abstract:

    The governing equations and mathematical model of the stability parameter H are given in bipolar coordinate system when power law fluid flows in annulus with the inner cylinder executing a Planetary Motion in this paper. The stability parameter H of power law fluid in both wide clearance and thin clearance in annulus with the inner cylinder executing a Planetary Motion is numerically calculated by finite difference method, the influences of the revolution velocity, rotation velocity, the eccentric distance and the pressure gradient on the stability parameter are analyzed. The results indicate that the eccentricity and the pressure gradient are main influence factors on it. The critical value of stability parameter for the flow of power-law fluid with the inner cylinder executing a Planetary Motion is 404 by means of experiment of CMC aqueous solution in annulus with the inner cylinder executing a Planetary Motion.

  • Numerical Computation of Pressure Gradient for the Flow of Power-Law Fluid in Annulus with Inner Cylinder Executing a Planetary Motion
    Journal of Hydrodynamics, 2020
    Co-Authors: Shu Yun Zhang
    Abstract:

    With the governing equations for the flow of the power-law fluid in annulus with the inner cylinder executing a Planetary Motion being transformed by using the undetermined coefficient method, the formula of pressure gradient for this flow under the given flow rate and the relevant numerical calculation method are given in this article. Through the experiments on the flow of Hydrolyzed Polyacrylamide (HPAM) aqueous solution which can be regarded as a power-law fluid, the calculated results of the pressure gradient values are compared with measured data, the mean relative error between them is smaller than 5%, which verifies the results presented in this article.

  • Calculation of flow rate for flow of the second-order fluid having variable coefficients in annulus with the inner cylinder executing a Planetary Motion
    The 2010 IEEE International Conference on Information and Automation, 2010
    Co-Authors: Shu Yun Zhang
    Abstract:

    The governing equations of the flow of the second-order fluid having variable coefficients in annulus with the inner cylinder executing a Planetary Motion are established, and the flow rate calculation formula is given in this paper. The governing equations are calculated numerically by the finite difference method, on the base of above results, the laminar flow rate is numerically calculated using simpson integration formula. Influences of the revolution and the rotation velocity of the inner cylinder, the eccentricity and the pressure gradient in annulus on the flow rate are analyzed. The results show that the eccentricity and pressure gradient are main influence factors. The experiments for the flow of Hydrolyzed Polyacrylamide (HPAM) aqueous solution which can be regarded as the second-order fluid having variable coefficients in annulus with the inner cylinder executing a Planetary Motion are carried out, the theoretical flow rate calculated numerically is compared with those measured practically, the even relative percent error between them is smaller than 5%, it verifies that the governing equations, flow rate calculated formula and the relevant numerical calculation method given in this paper for the flow of the second-order fluid having variable coefficients in annulus with the inner cylinder executing a Planetary Motion are correct.

  • The Secondary Flow of the Flow of the Second-Order Fluid having Variable Coefficients in Annulus with the Inner Cylinder Executing a Planetary Motion
    2010 Third International Joint Conference on Computational Science and Optimization, 2010
    Co-Authors: Shu Yun Zhang
    Abstract:

    The governing equations of the flow of the second-order fluid having variable coefficients in annulus with the inner cylinder executing a Planetary Motion are established in the moving bipolar coordinate system, and the governing equations are numerically solved by using the finite difference method, then the distribution of the stream-function of the flow is obtained. The results show: the secondary flow appears in the flow of the second-order fluid having variable coefficients in annulus with the inner cylinder executing a Planetary Motion, and the distribution of the secondary flow is related with the direction and magnitude of the revolution and the rotation velocity of the inner cylinder and the eccentric distance of annulus.

Hidetake Tanaka - One of the best experts on this subject based on the ideXlab platform.

  • Machinability of Thermo-Plastic Carbon Fiber Reinforced Plastic in Inclined Planetary Motion Milling
    International journal of automation technology, 2018
    Co-Authors: Hidetake Tanaka, Mitsuru Kitamura
    Abstract:

    The study deals with an improved method of milling thermo-plastic CFRP with a radius end mill. The authors use inclined Planetary milling to carry out a fine CFRP boring technique. The inclined Planetary Motion milling consists of the two independent spindle Motions of tool rotation and revolution. The eccentricity of the tool rotation axis is realized by a few degrees of inclination from the revolution axis. The movement of eccentric mechanism can be reduced by comparing it with that of orbital drilling. The inclined Planetary Motion milling reduces inertial vibration and decreases cutting force. Owing to the geometrical cutting principle, material delamination and burrs can be decreased. Thermo-plastic CFRP has recently been under development as an alternative structural material for the next generation of automobiles and in response to demands for bored fastening holes. The shape of the cutting edge of the ball end mill is suitable for the inclined Planetary milling, as revealed by results of past experiments done on thermo-set CFRP. However, the ball end mill has left burrs and melted matrix on the exit side in the case of thermo-plastic CFRP. The radius end mill has the advantage over the ball end mill in terms of finishing fine boring. Based on the consideration of the schematic model and experiments using the Taguchi method, the improved milling conditions are examined.

  • machinability evaluation of inclined Planetary Motion milling system for difficult to cut materials
    Key Engineering Materials, 2015
    Co-Authors: Hidetake Tanaka, Toma Yoshita
    Abstract:

    CFRP and Titanium alloy, which are known as difficult-to-cut materials have been widely used as structural material in aviation industries. The orbital drilling is one of an effective drilling technique for the industries. However this technique has some disadvantages such as increase of cutting force due to cutting with tool center point, inertial vibration generated by revolution and high installation cost. In order to improve the disadvantages, we have invented a new drilling technique which is called inclined Planetary Motion milling. The inclined Planetary Motion milling and the Planetary mechanism drilling has two axes of cutting tool rotation axis and revolution axis. Cutting tool rotation axis of the orbital drilling is moved parallel to the revolution axis in eccentric. On the other hand, in the case of the inclined Planetary Motion milling, eccentric of the cutting tool rotation axis is realized by inclination of a few degrees from the revolution axis. Therefore, the movement of eccentric mechanism can be reduced by comparison with the orbital drilling because inclined angle is smaller than eccentricity of the cutting tool tip. As a result, eccentric mechanism can be downsized and inertial vibration is reduced. In the study, a geometrical cutting model of inclined Planetary Motion milling was set up. The theoretical surface roughness of the inside of drilled holes by use of two types cutting tool geometry were calculated based on the model. And cutting experiments using the new prototype for CFRP were carried out in order to evaluate the effect on machinability with change of cutting point atmosphere. In addition, optimal cutting condition was derived according to cutting experiments for titanium alloys utilizing the orthogonal array.

  • an evaluation of cutting edge and machinability of inclined Planetary Motion milling for difficult to cut materials
    Procedia CIRP, 2015
    Co-Authors: Hidetake Tanaka, Mitsuru Kitamura
    Abstract:

    Abstract Recently, the applications of difficult-to-cut materials (e.g. CFRP and titanium alloy) are increasing in the aviation and automotive industries. Conventional drilling tools occur burr and/or delamination on their materials. The inclined Planetary Motion milling consists of two independent spindle Motions which are tool rotation and revolution. Eccentricity of the tool rotation axis is realized by inclination of few degrees from revolution axis. The movement of eccentric mechanism can be reduced by comparison with that of the orbital drilling. The inclined Planetary Motion milling reduces inertial vibration and decreases cutting force. According to the geometrical cutting principle, it can be decreased delamination and burr of their materials, comparing to orbital drilling. In the study, the authors revaluated optimum cutting condition for titanium alloy by use of the experimental design and carried out its repeatability test. And the authors developed on measurement and evaluation method for cutting edge profiles and examined the comprehensive discussion of the relationship among change to cutting edge wear and surface texture and circularity on drilling hole, tool rotation torque after based on the practical drilling experiments.

  • Experimental study on tilted Planetary Motion drilling for CFRP
    Procedia CIRP, 2012
    Co-Authors: Hidetake Tanaka, Ryo Takizawa, Kazuki Ohta, Kazuhiro Yanagi
    Abstract:

    The study deals with a proposal and experimental study on the tilted Planetary Motion drilling for CFRP. The authors have modified cutting mechanism principle of the orbital drilling, which named as the tilted Planetary Motion drilling. Its axis of tool rotation spindle is not parallel to the axis of Planetary revolution. The tilted angle is adjustable from 0 to 2 degrees. Because of tool rotation axis is tilted, penetration is not caused by outermost cutting edges but inner cutting edges. If penetration could be occurred, the inner cutting edges penetrate firstly, then the outermost edges enlarge drilled hole and these sequence can avoid generation of delaminations and burrs. The tilted Planetary Motion drilling has been demonstrated by the practical fundamental drilling experiment by use of a high-speed spindle unit and a lathe as imitating tilted Planetary Motion. From the experimental result, capability of tilted Planetary Motion drilling has been realized and no burrs and delaminations are observed on the workpiece. © 2012 The Authors.

  • experimental study on tilted Planetary Motion drilling for cfrp
    Procedia CIRP, 2012
    Co-Authors: Hidetake Tanaka, Ryo Takizawa, Kazuki Ohta, Kazuhiro Yanagi
    Abstract:

    Abstract The study deals with a proposal and experimental study on the tilted Planetary Motion drilling for CFRP. The authors have modified cutting mechanism principle of the orbital drilling, which named as the tilted Planetary Motion drilling. Its axis of tool rotation spindle is not parallel to the axis of Planetary revolution. The tilted angle is adjustable from 0 to 2 degrees. Because of tool rotation axis is tilted, penetration is not caused by outermost cutting edges but inner cutting edges. If penetration could be occurred, the inner cutting edges penetrate firstly, then the outermost edges enlarge drilled hole and these sequence can avoid generation of delaminations and burrs. The tilted Planetary Motion drilling has been demonstrated by the practical fundamental drilling experiment by use of a high-speed spindle unit and a lathe as imitating tilted Planetary Motion. From the experimental result, capability of tilted Planetary Motion drilling has been realized and no burrs and delaminations are observed on the workpiece.

Yanhom Li - One of the best experts on this subject based on the ideXlab platform.

  • self assembly and novel Planetary Motion of ferrofluid drops in a rotational magnetic field
    Microfluidics and Nanofluidics, 2015
    Co-Authors: Chingyao Chen, Hao Chung Hsueh, Sheng Yan Wang, Yanhom Li
    Abstract:

    We experimentally investigate the Motion of a ferrodrop array in a rotating magnetic field. Magnetized and driven by the external field, the ferrodrops are stretched and self-aligned to form a drop array along the field orientation. An interesting planet-like dual rotation, including local self-spins of individual drops and a global revolution of the drop array, is newly identified. While the drops spin nearly synchronized with the external field, the revolution always lags behind the field and appears a forth and back movement. Prominence of the net revolutionary movement depends on the strength and uniformity of the overall field as well as the number of drops containing in the array. In general, more uniform and stronger rotating field leads to a more prominent global revolution. Phenomenon of such Planetary Motion can be applied to mix two fluids more effectively than self-spin drops.

Kazuhiro Yanagi - One of the best experts on this subject based on the ideXlab platform.

  • Experimental study on tilted Planetary Motion drilling for CFRP
    Procedia CIRP, 2012
    Co-Authors: Hidetake Tanaka, Ryo Takizawa, Kazuki Ohta, Kazuhiro Yanagi
    Abstract:

    The study deals with a proposal and experimental study on the tilted Planetary Motion drilling for CFRP. The authors have modified cutting mechanism principle of the orbital drilling, which named as the tilted Planetary Motion drilling. Its axis of tool rotation spindle is not parallel to the axis of Planetary revolution. The tilted angle is adjustable from 0 to 2 degrees. Because of tool rotation axis is tilted, penetration is not caused by outermost cutting edges but inner cutting edges. If penetration could be occurred, the inner cutting edges penetrate firstly, then the outermost edges enlarge drilled hole and these sequence can avoid generation of delaminations and burrs. The tilted Planetary Motion drilling has been demonstrated by the practical fundamental drilling experiment by use of a high-speed spindle unit and a lathe as imitating tilted Planetary Motion. From the experimental result, capability of tilted Planetary Motion drilling has been realized and no burrs and delaminations are observed on the workpiece. © 2012 The Authors.

  • experimental study on tilted Planetary Motion drilling for cfrp
    Procedia CIRP, 2012
    Co-Authors: Hidetake Tanaka, Ryo Takizawa, Kazuki Ohta, Kazuhiro Yanagi
    Abstract:

    Abstract The study deals with a proposal and experimental study on the tilted Planetary Motion drilling for CFRP. The authors have modified cutting mechanism principle of the orbital drilling, which named as the tilted Planetary Motion drilling. Its axis of tool rotation spindle is not parallel to the axis of Planetary revolution. The tilted angle is adjustable from 0 to 2 degrees. Because of tool rotation axis is tilted, penetration is not caused by outermost cutting edges but inner cutting edges. If penetration could be occurred, the inner cutting edges penetrate firstly, then the outermost edges enlarge drilled hole and these sequence can avoid generation of delaminations and burrs. The tilted Planetary Motion drilling has been demonstrated by the practical fundamental drilling experiment by use of a high-speed spindle unit and a lathe as imitating tilted Planetary Motion. From the experimental result, capability of tilted Planetary Motion drilling has been realized and no burrs and delaminations are observed on the workpiece.

Chingyao Chen - One of the best experts on this subject based on the ideXlab platform.

  • Interaction of a pair of ferrofluid drops in a rotating magnetic field
    Journal of Fluid Mechanics, 2018
    Co-Authors: Shahriar Afkhami, Chingyao Chen, James J. Feng
    Abstract:

    We use two-dimensional numerical simulation to study the interaction between a pair of ferrofluid drops suspended in a rotating uniform magnetic field. Numerical results show four distinct regimes over the range of parameters tested: independent spin, Planetary Motion, drop locking and direct coalescence. These are in qualitative agreement with experiments, and the transition between them can be understood from the competition between magnetophoretic forces and viscous drag. We further analyse in detail the Planetary Motion, i.e. the revolution of the drops around each other while each spins in phase with the external magnetic field. For drops, as opposed to solid microspheres, the interaction is dominated by viscous sweeping, a form of hydrodynamic interaction. Magnetic dipole–dipole interaction via mutual induction only plays a secondary role. This insight helps us explain novel features of the Planetary revolution of the ferrofluid drops that cannot be explained by a dipole model, including the increase of the angular velocity of Planetary Motion with the rotational rate of the external field, and the attainment of a limit separation between the drops that is independent of the initial separation.

  • self assembly and novel Planetary Motion of ferrofluid drops in a rotational magnetic field
    Microfluidics and Nanofluidics, 2015
    Co-Authors: Chingyao Chen, Hao Chung Hsueh, Sheng Yan Wang, Yanhom Li
    Abstract:

    We experimentally investigate the Motion of a ferrodrop array in a rotating magnetic field. Magnetized and driven by the external field, the ferrodrops are stretched and self-aligned to form a drop array along the field orientation. An interesting planet-like dual rotation, including local self-spins of individual drops and a global revolution of the drop array, is newly identified. While the drops spin nearly synchronized with the external field, the revolution always lags behind the field and appears a forth and back movement. Prominence of the net revolutionary movement depends on the strength and uniformity of the overall field as well as the number of drops containing in the array. In general, more uniform and stronger rotating field leads to a more prominent global revolution. Phenomenon of such Planetary Motion can be applied to mix two fluids more effectively than self-spin drops.