Targeting of PbSe-γ-Fe2O3 Nanoplatforms by External Magnetic Field Under Viscous Flow Conditions

2010 ◽  
Vol 8 (3) ◽  
pp. 383-386
Author(s):  
Lioz Etgar ◽  
Arie Nakhmani ◽  
Allen Tannenbaum ◽  
Efrat Lifshitz ◽  
Rina Tannenbaum
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Viscous Flow ◽  
Flow Conditions

scholarly journals Trajectory control of PbSe–γ-Fe2O3nanoplatforms under viscous flow and an external magnetic field

2010 ◽  
Vol 21 (17) ◽  
pp. 175702 ◽  
Author(s):  
Lioz Etgar ◽  
Arie Nakhmani ◽  
Allen Tannenbaum ◽  
Efrat Lifshitz ◽  
Rina Tannenbaum
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Viscous Flow ◽  
Trajectory Control

Characterizing Heat Transfer Enhancement in Ferrofluid 2-D Channel Flows Using Mixing Numbers

2021 ◽  
Author(s):  
Nadish Anand ◽  
Richard Gould
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
External Magnetic Field ◽  
Heat Transfer Enhancement ◽  
Channel Flow ◽  
Channel Flows ◽  
Mixing Enhancement ◽  
Flow Conditions ◽  
Transfer Enhancement ◽  
Carrier Fluid

Abstract Ferrofluid channel flows have been used for many non-invasive flow manipulation applications, including drug-delivery, heat transfer enhancement, mixing enhancement, etc. Heat transfer enhancement is one of the most coveted outcomes from novel cooling systems employed for electronic cooling. While using Ferrofluids for heat transfer enhancement, the external magnetic field usually induces Kelvin Body Force, which causes the ferrofluid to swirl or ‘mix’. This mixing process causes extra convection over what is induced through fluid inertia and is responsible for heat transfer enhancement. In order to understand the phenomenon of heat transfer enhancement, it would be logical to view it from the perspective of mixing enhancement. Moreover, channel flows are most common in liquid cooling of electronics equipment, and hence such a fundamental understanding of synergies between mixing and heat transfer enhancement can help pose design rules for advanced cooling configuration for electronics cooling. In this work, a Ferrofluid channel flow is analyzed in the presence of an external magnetic field. A 2-D 90° bend channel ferrofluid flow is considered, with a significant length scale of 0.01 m, where two external current-carrying wires provide an external magnetic field. An external inward heat flux of 1000 W/m2 is applied on the walls of the channel. The channel flow is studied numerically by varying different parameters relating to the external magnetic field and flow conditions. The ferrofluid used is considered magnetite based on water as the carrier fluid, and the properties of which are modeled using appropriate mixture models for nanofluids. The mixing induced in the flow is characterized by using two different mixing numbers based on the flow velocity. This type of characterization is analogous to characterizing flow turbulence. The heat transfer enhancement is characterized using Nusselt numbers. These non-dimensional numbers (mixing) are studied in congruence with the Nusselt number to understand the relationship between the mixing and heat transfer and draw comparative inferences with flow conditions without heat transfer enhancement. Finally, conclusions are drawn between the mixing & heat transfer intensification at local and global levels and choosing the apposite mixing numbers to characterize heat transfer enhancement.

An instability of laminar flow of mercury caused by an external magnetic field

1955 ◽  
Vol 233 (1194) ◽  
pp. 299-302 ◽  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Laminar Flow ◽  
Viscous Flow ◽  
Fluid Layer ◽  
The State ◽  
Conducting Liquid ◽  
Rotating Cylinders ◽  
Electrically Conducting ◽  
Gravitational Stability

Recent research on magneto-hydrodynamics has indicated the existence of a great number of situations where a magnetic field stabilizes the state of motion of an electrically conducting liquid. Examples have been given by Hartmann & Lazarus (1937), Murgatroyd (1953 a,b ), Shercliff (1953), and Stuart (1954) for viscous flow between parallel planes and in pipes, by Chandrasekhar (1953) and Lehnert (1952 a ) for viscous flow between rotating cylinders, by Chandrasekhar & Fermi (1953) for problems of gravitational stability and by Chandrasekhar (1952) and Nakagawa (1955) for the inhibition of convection in a fluid layer.

RECOIL IMPLANTATION MÖSSBAUER EXPERIMENT ON 57Fe IN Ge IN THE PRESENCE OF AN EXTERNAL MAGNETIC FIELD

1980 ◽  
Vol 41 (C1) ◽  
pp. C1-445-C1-445
Author(s):  
G. Langouche ◽  
N. S. Dixon ◽  
L. Gettner ◽  
S. S. Hanna
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Recoil Implantation
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