3D Helmholtz Coil System Design for Measuring the Thermal Conductivity of Magnetic Nanofluids

2021 ◽  
Author(s):  
Rahime Alsangur ◽  
Serkan Doganay ◽  
Alpaslan Turgut ◽  
Levent Cetin
Keyword(s):  
Thermal Conductivity ◽  
System Design ◽  
Helmholtz Coil ◽  
Coil System ◽  
Magnetic Nanofluids

Thermal Conductivity Enhancement of Room Temperature Ionic Liquids (RTILs) With Various Magnetic Nanoparticles

2012 ◽  
Author(s):  
N. Y. Jagath B. Nikapitiya ◽  
Hyejin Moon
Keyword(s):  
Thermal Conductivity ◽  
Ionic Liquids ◽  
Magnetic Nanoparticles ◽  
Magnetic Fields ◽  
Room Temperature ◽  
Particle Concentration ◽  
Thermal Conductivity Enhancement ◽  
Room Temperature Ionic Liquids ◽  
Conductivity Enhancement ◽  
Magnetic Nanofluids

This paper reports an experimental study of thermal conductivity of room temperature ionic liquids (RTILs) based magnetic nanofluids. Various magnetic nanoparticles of metal oxides with high thermal conductivity, such as CuO, Al2O3, Fe3O4 and Carbon Nano Tubes (CNTs), were used to prepare magnetic nanofluids, while RTIL, trihexyl (tetradecyl) posphonium dicyanamide was used as the base fluid. Two major parameters that affect to the thermal conductivity enhancement of fluids were investigated. The effect of particle concentration and external magnetic fields were tested. It was observed that the magnetic nanofluids thermal conductivities increase with increment of particle concentration and external magnetic field parallel to the temperature gradient. Besides, it was observed that under higher magnetic fields, thermal conductivity enhancement tends to approach a saturation state. Surfactant was used to disperse magnetic nanoparticles within the RTILs. The transient hot wire method was used for this investigation.

scholarly journals Tri Axial Square Helmholtz Coil system at the Alibag Magnetic Observatory: Upgraded to Magnetic Sensor calibration facility

2017 ◽  
Author(s):  
Prasanna Mahavarkar ◽  
Jacob John ◽  
Vijay Dhapre ◽  
Varun Dongre ◽  
Sachin Labde
Keyword(s):  
Current Source ◽  
Helmholtz Coil ◽  
Constant Current ◽  
Test Facility ◽  
Sensor Calibration ◽  
Magnetic Observatory ◽  
Data Logging ◽  
Constant Current Source ◽  
Technical Problems ◽  
Coil System

Abstract. A Tri Axial Square Helmholtz Coil system for the study of palaeomagnetic studies was successfully commissioned at the Alibag magnetic observatory in the year 1985. This system was used for few years after which the system encountered technical problems with the control unit. Rectification of the same could not be undertaken as the information document related to this system was not available and as a result the said system had been lying in an un-used state for a long time until 2015 when the system was re-commissioned and upgraded as a test facility for calibrating the magnetometer sensors. We have upgraded the system with a constant current source and a data logging unit. Both these units have been designed and developed in the institute laboratory. Also re-measurements of the existing system have been made thoroughly. The upgraded system is semi automatic, enabling non-specialists to operate it after a brief period of instruction. This facility is now in broad use for the parent institute and external institutions to calibrate their magnetometers and also serves as a national facility. Here the design of this system with the calibration results for the space borne fluxgate magnetometers is presented.

scholarly journals Effect of Magnetic Field on Thermal Conductivity of the Cobalt Ferrite Magnetic Nanofluids

2020 ◽  
Vol 1644 ◽  
pp. 012028
Author(s):  
Prashant B. Kharat ◽  
Sandeep B. Somvanshi ◽  
Pankaj P. Khirade ◽  
K. M. Jadhav
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Cobalt Ferrite ◽  
Magnetic Nanofluids

Magnetic Field Induced Enhancement in Thermal Conductivity and Viscosity of Stabilized Vacuum Pump Oil (VPO)—Fe3O4 Magnetic Nanofluids

2015 ◽  
Vol 4 (1) ◽  
pp. 7-15 ◽  
Author(s):  
L. Syam Sundar ◽  
E. Venkata Ramana ◽  
Manoj K. Singh ◽  
Antonio C. M. Sousa
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Vacuum Pump ◽  
Magnetic Nanofluids

Rotating/Helmholtz coil system using a lock-in amplifier method

1998 ◽  
Vol 5 (3) ◽  
pp. 475-477 ◽  
Author(s):  
T. Tanabe ◽  
H. Kitamura
Keyword(s):  
Magnetic Flux ◽  
Storage Ring ◽  
Magnetic Induction ◽  
Magnetization Vector ◽  
Helmholtz Coil ◽  
Coil System ◽  
Lock In

Measurement of integrated magnetic induction is an important part of the construction of insertion devices. The so-called `flipping coil system' is normally utilized to characterize the integrated multipole components of the device, a requirement which varies from one storage ring to another. A Helmholtz coil system is used to determine a magnetization vector of each magnet piece in the device. Both systems are designed to measure the integrated magnetic flux to deduce the necessary quantities using the known relationship. We have developed an unconventional system which has a continuously rotating mechanism that allows the use of a lock-in amplifier instead of an integrator or a voltmeter. Detailed descriptions of the equipment are given.

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