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seawater, and have a good quality of separated oil with the
containing water ratio less than 5%. An analysis model to
describe the operating principle in MHD oil separation is
presented in the paper. Multiphase flow with different
components including oil, seawater and gas is considered
in the model, and coupled fields of electromagnetic field
and fluid are solved with finite-element method (FEM). The
flow velocity, pressure, volume fraction distribution of each
phase (water and oil) are analyzed, comparing with the
data of demonstration test, the numerical simulation result
is validated.
TUA12PO03
Experimental Study on AC MHD Pump
Y. Peng, S. Song, C. Sha, L. Zhao, R. Li, J. Ling, A. Peng,
Institute of Electrical Engineering, CAS.
Theoretical and experimental investigations on AC MHD
are carried out in the IEECAS. An experimental device to
simulate a blood pump is manufactured. The system
comprises a four-pole annular permanent magnet,
channels with different parameters and motor with variable
frequency controller. The magnet generates a field similar
to sinusoid with the maximum of 0.75T along the circle to
simulate an AC magnetic field when it is rotated up by
motor. This moving magnetic field acts on the conductive
fluid in the channel, and produces an electromagnetic force
to move the fluid with the same direction as that of the
magnet rotating. The rotate speed is changed in the range
of 0 to 3500rpm. Four annular channels with different
configurations are designed and tested in the test device.
The electric conductivity of fluid is changed in 5 stages of
0.6, 1.2, 5, 10, 15s/m. In each case, the flow rate and
pressure of fluid are measured. The results and discussion
are presented in the paper. A 2-D simulation analysis on
ACMHD driver is described in the paper. Coupled fields of
magnetic field and fluid field are solved and simulated with
finite-element method (FEM). Relationship of magnetic
field, frequency, conductivity of the fluid, flow rate, and
pressure are analyzed. The agreement between
experimental values and analysis is satisfied.
TUA12PO04
New Type Superconducting Bulk Magnet by Pulse
Field Magnetizing with Usable Surfaces on Both-sides
in Open Space
H. Fujishiro, A. Fujiwara, M. Kaneyama, T. Tateiwa, Iwate
University; T. Oka, IMRA Material R&D Co., Ltd.; H.
Hayashi, Kyushu Electric Power Co., Inc.
For the practical applications of a high-Tc bulk
superconductor (HTSC) as a high-strength bulk magnet in
a magnetic separation system and so on, the HTSC bulk is
usually cooled down below the liquid N2 temperature along
the c-axis on the cold stage of the helium refrigerator and
then magnetized by field cooled magnetizing (FCM) or
pulse field magnetizing (PFM) along the c-axis. In this
setup, only the upper surface of the bulk can be used as a
magnetic pole in open space due to the restriction of the
cooling procedure. If both the upper and lower surfaces of
the bulk can be used effectively in open space, a new field
of application should develop. In this paper, we propose
and test a new type of the HTSC bulk magnet, where the
bulk disk is cooled down from the side face (ab-plane) by
thermal conduction and is magnetized by PFM along the c-
axis using a sprit coil. This cooling procedure is expected
to reduce the cooling time and the recovering time in
temperature after the heat generation by PFM because the
ab-plane thermal conductivity k(ab) is much higher than c-
axis k(c). The vacuum sheath with two parallel surfaces is
situated at 4 mm above the bulk surfaces. The magnetizing
mechanism and the technical development for this type
bulk magnet are discussed and compared with those of the
bulk magnet which utilizes only the upper surface of the
bulk.
TUA12PO05
Removal of Aerosol by Magnetic Separation
H. Okada, H. Okuyama, M. Uda, N. Hirota, NIMS.
Aerosol means suspended fine liquid or solid particles with
a diameter from 1 nm to 100 mm in gas. Removal
techniques of aerosol continue to be very important for a
long time because fine particles in exhaust gas of cars and
factory smoke are environment problems that are closest
for us. Recently removal or capturing techniques of nanoparticles
are widely noticed from nano-technology, too.
They have to capture and separate nano-particles without
damaging characteristics in any environment and condition,
subsequently to fabricating nano-particles. We examined
high gradient magnetic separation experiments of iron
(ferromagnetic) nano-particles with a nominal diameter of
30 nm by a superconducting magnet. In the experiment we
fabricated fine iron particles by thermal reactive plasma
method in argon and hydrogen mixed gas and sent them to
the magnetic separator directly. We present experimental
results, functions of capture ratio on magnetic field and
velocity of flow and so on. We conclude that high gradient
magnetic separation is useful for nano-technology.
TUA12PO06
Industrial applications of HTSC coils using next
generation BSCCO wire
T. Okazaki, K. Okura, T. Kato, K. Hayashi, K. Sato,
Sumitomo Electric Industries.
Two examples of industrial applications of High-
Temperature Superconducting (HTS) magnets/coils are
presented. These applications employ newly developed
“Drastically Innovative Bismuth-based HTS wire (DI-
BSCCO wire)” which is commercially available using
Sumitomo Electric’s innovative fabrication process called
Controlled-Over Pressure (CT-OP) sintering. The first
application is the HTS coils for an electrical propulsion
motor of a ship. The motor is designed to be used at the
liquid nitrogen temperature to acquire economical
operating conditions and durability. This motor employs
iron cores to reduce magnetic field at the coils. Installation
of air gaps hold off the saturation issue of iron cores. This
motor has successfully demonstrated its performance in a
test tank. The second application of the HTS coil is a cryocooler
cooled high-field magnet for analysis and research
works. Increasing applications of high-field magnetic field
require handy and economical operating magnets. This
magnet has a room temperature bore of 200mm and
consists of 40km of DI-BSCCO wire. Two DI-BSCCO wires
are bundled and wound in double-pancake shape without
stainless steel enforcement. The DI-BSCCO wire has
almost the same tensile strength as that of the usual
copper wire. This condition is explained by existence of
almost perfectly compressed superconducting filaments.
This improved wire strength enables easier winding and
stronger coil characteristics.
TUA12PO07
3D Electromagnetic Analysis of Levitating Transporter
using Bulk Superconductor
H. Ueda, S. Tsuchiya, S. Azumaya, A. Ishiyama, Waseda
University.
It is possible that the bulk superconductor (HTS bulk) is
levitated without any fixed mechanical guides by the
permanent magnet or electromagnet after a field-cooling
MT-19 2005, Genova 80