Effect of magnetic field on laminar convective heat transfer characteristics of ferrofluid flowing through a circular stainless steel tube

2016 ◽  
Vol 59 ◽  
pp. 74-86 ◽  
Author(s):  
Mohammed Asfer ◽  
Balkrishna Mehta ◽  
Arun Kumar ◽  
Sameer Khandekar ◽  
Pradipta Kumar Panigrahi
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Stainless Steel ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics

Convective Heat Transfer of Nanofluids (DI Water-Al2O3) in Micro-Channels

2007 ◽  
Author(s):  
Joohyun Lee ◽  
Roger D. Flynn ◽  
Kenneth E. Goodson ◽  
John K. Eaton
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Stainless Steel ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Volume Concentration ◽  
Tube Wall ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Micro Channels

The convection performance of nanofluids in microchannels has received relatively little attention. This work reports convective heat transfer experiments of deionized water/Al2O3 nanofluids using 200μm hydraulic diameter MEMs fabricated microchannel structures and a stainless steel tube with 250μm inside diameter. The tube wall is heated electrically producing a constant heat flux boundary condition and an infrared camera is used to measure the outside tube wall temperature. A full numerical conjugate analysis of the apparatus is used to infer the fluid thermal conductivity from the temperature measurements. The effective thermal conductivity of nanofluids increased only by 4% for 4% volume concentration nanofluids in the MEMs fabricated microchannel and 5% for 3% volume concentration in the stainless steel tube under laminar flow conditions. The effective viscosity of the nanofluids increased 12% for 2% volume concentration. A dynamic light scattering system was used to measure the effective particle diameter and particle size distributions of nanoparticles with various pH values and surfactants. The measured mean diameter of Al2O3 nanoparticle is 170 nm, which is larger than the 40–50 nm nominal size.

Heat Transfer Characteristics of Fe3O4-H2O Nanofluids by External Magnetic Field

2014 ◽  
Vol 487 ◽  
pp. 50-53 ◽  
Author(s):  
Shao You Yin ◽  
Zhi Jiang Wu
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
External Magnetic Field ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Experimental System ◽  
Axial Distance ◽  
Magnetic Field Direction ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics

An experimental system of Fe3O4-H2O nanofluids on convective heat transfer characteristics was presented. The influences of magnetic field direction and intensity, particle mass fraction, axial distance were presentd. The experimental results show that the synergic function between the external magnetic field and the thermal field has impact on convective heat transfer characteristics of the device.

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