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RISS 인기검색어
- 검색키워드
- 주제어 : Magnetohydrodynamic (MHD) flow (검색결과 6 건)
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La, Moonwoo,Kim, Wonkyoung,Yang, Wonseok,Kim, Hyung Woo,Kim, Dong Sung 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.3
In this paper, we present a design methodology for the generation of magnetohydrodynamic (MHD) complex flows in a simple straight microchannel inside which electrodes are patterned on the two side walls and the bottom wall. The Lorentz force, a driving force for the MHD flow, can be variously induced in the microchannel by changing the applied voltages at the patterned electrodes and the magnetic field. The design methodology for determining the required condition for the applied voltage at each electrode is discussed for generating axial, transverse, sinusoidal, and multi-vortical flows under a given magnetic field. Three-dimensional CFD (computational fluid dynamics) simulations demonstrate the successful generation of the designed complex flows in a microchannel. The mixing performances of axial, sinusoidal, and multi-vortical flows were evaluated as an application example of the present MHD complex flows. The present design methodology may be also applied for the precise control of the fluid flow inside a microchannel, not to mention the micromixing.
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다중 와류 유동을 이용한 자기유체역학 (MHD) 마이크로 믹서
양원석(Wonseok Yang),김동성(Dong Sung Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.1
본 논문에서는, 자기유체역학(MHD)을 기반으로 마이크로 채널 내부에 다중 와류 유동을 발생시키는 새로운 형태의 카오스 마이크로 믹서를 제안한다. 제안된 마이크로 믹서의 마이크로 채널 내부에는 양 측면과 바닥면에 전극들이 배치되어 있다. 배치된 전극들에 인가되는 전압 조건에 따라 다양한 형태로 로렌츠 힘이 유도되며, 이렇게 유도된 로렌츠 힘은 마이크로 채널 내부 유체의 추진 및 혼합을 야기할 수 있다. 제안된 MHD 마이크로 믹서의 혼합 양상을 평가하기 위해 3 차원 전산유체역학 시뮬레이션을 수행하였다. 이를 통해 다양한 유동 조건에 대해 MHD 마이크로 믹서의 혼합 성능을 평가하였다. In this paper, we propose a novel chaotic micromixer of which mixing mechanism is based upon magnetohydrodynamic (MHD) multi-vortical flow generation in a simple straight microchannel. In the microchannel of the micromixer has electrodes patterned on two side walls and bottom wall. Lorentz forces are variously induced by changing applied voltages at the patterned electrodes in order to pump and mix conductive fluids in the microchannel. Three-dimensional computational fluid dynamics simulations were conduced to characterize mixing behaviors inside the MHD micromixer. The mixing efficiencies were also evaluated for the various flow conditions.
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The design and fabrication of a small MHD pump for liquid sodium circulation
Pergamon Press ; Elsevier Science Ltd 2014 Annals of nuclear energy Vol.73 No.-
The linear annular magnetohydrodynamic (MHD) pump was designed for the purpose of transporting the electrically conducting liquid sodium that is used as a coolant in a Sodium cooled Fast Reactor (SFR) operating at high temperatures (over 550<SUP>o</SUP>C). The MHD pump was designed by using an equivalent circuit method which is commonly employed to the design of the induction machines. The mathematical equations on the developing pressure and efficiency was found out by using Laithewaite's standard design formula. The main geometrical parameters for the design were the pump core length, the diameter of the pump and the annular gap size. The dominant electromagnetic variables were the input frequency, magnetic pole pitch and number, and coil turns. Especially, it was shown that the developing pressure and efficiency were maximized at the range of frequencies below the commercial value of 60Hz. Also, the size of an annular gap was suitably selected considering the hydraulic frictional loss at the narrow annular channel. The P-Q characteristic was theoretically predicted according to the change of the input current, voltage and power. The functional and structural components of the pump consisted of the material compatible with the high temperature and chemical reactivity of the liquid sodium. The designed pump was predicted to have the nominal flowrate of 10L/min and the developing pressure of 4bar.
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Sajid Qayyum,Tasawar Hayat,Sabir A. Shehzad,Ahmed Alsaedi 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.8
The main purpose of this article is to describe the magnetohydrodynamic stagnation point flow ofWalter-B nanofluid over a stretching sheet. The phenomena of heat and mass transfer are based on theinvolvement of thermal radiation and chemical reaction. Characteristics of Newtonian heating are givenspecial attention. The Brownian motion and thermophoresis models are introduced in the temperatureand concentration expressions. Appropriate variables are implemented for the transformation of partialdifferential frameworks into sets of ordinary differential equations. Plots for velocity, temperature, andnanoparticle concentration are displayed and analyzed for governing parameters. The skin friction coefficientand local Nusselt and Sherwood numbers are studied using numerical values. The temperatureand heat transfer rate are enhanced within the frame of the thermal conjugate parameter.
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Hamza Berrehal 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.6
An analytical analysis has been carried out to investigate the second law of thermodynamics in magnetohydrodynamic (MHD) boundary layer flow and heat transfer by moving wedge. The governing PDEs of momentum, energy, and entropy generation are converted into nonlinear ODEs via similarity variables and then solved analytically using the optimal homotopy asymptotic method. The expression of entropy generation number is obtained in dimensionless form. Results revealed that the minimum entropy production is achieved when the wedge moves in the opposite direction to the free stream (for the negative values of velocity ratio parameter λ). Moreover, the magnetic field influences the increase in entropy production.
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