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An Experimental Investigation Of The Thermomechanics Of Pipe Flow Of Magnetic Fluids In Response To Heating And Applied Magnetic Fields

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An Experimental Investigation Of The Thermomechanics Of Pipe Flow Of Magnetic Fluids In Response To Heating And Applied Magnetic Fields

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Author : Hooshyar M. Hamedani
language : en
Publisher:
Release Date : 1988

An Experimental Investigation Of The Thermomechanics Of Pipe Flow Of Magnetic Fluids In Response To Heating And Applied Magnetic Fields written by Hooshyar M. Hamedani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Magnetic fluids categories.

An experimental investigation was carried out to determine the thermodynamics and fluid mechanics of the pipe flow of magnetic fluids. A water-based magnetic fluid was synthesized in the laboratory and its relative viscosity and magnetic properties were determined as a function of temperature. A "thermomagnetic pump" was built and tested in which temperature differences caused the magnetic fluid to circulate through a loop when subjected to a magnetic field. In a conceptual study, the pumping capabilities of such a flow circulation were considered for a thermal rejection system application. Pumping capabilities were observed to be directly related to the slope of the pyromagnetic curve. The sensitivity of the fluid was enhanced by the addition of zinc, manganese, and cobalt compounds. Fluid properties and flow parameters, including viscosity, magnetization, velocity, pressure, and temperature, were determined. A theoretical analysis was conducted for the prediction of values and analysis of the nature of the magnetic body forces induced in a magnetic fluid in the presence of heat and magnetic fields. A technique is introduced for the prediction of the maximum pressure difference that a "thermomagnetic pump" could produce. The advantages of a thermomagnetic pump are that it is noise free and reliable due to the absence of moving parts and control devices. At present, however, the flow rates generated by such a system are small and much research and development is needed for practical applications.

Dissertation Abstracts International

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Author :
language : en
Publisher:
Release Date : 1989

Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Dissertations, Academic categories.

Previews Of Heat And Mass Transfer

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Author :
language : en
Publisher:
Release Date : 1990

Previews Of Heat And Mass Transfer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Heat categories.

Applied Mechanics Reviews

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Author :
language : en
Publisher:
Release Date : 1973

Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Mechanics, Applied categories.

American Doctoral Dissertations

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Author :
language : en
Publisher:
Release Date : 1988

American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Dissertation abstracts categories.

Experimental Investigation Of Magnetically Driven Flow Of Ferrofluids In Porous Media

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Author :
language : en
Publisher:
Release Date : 1998

Experimental Investigation Of Magnetically Driven Flow Of Ferrofluids In Porous Media written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.

This report presents experimental results of the flow of ferrofluids in porous media to investigate the potential for precisely controlling fluid emplacement in porous media using magnetic fields. Ferrofluids are colloidal suspensions of magnetic particles stabilized in various carrier liquids. In the presence of an external magnetic field, the ferrofluid becomes magnetized as the particles align with the magnetic field. Potential applications of ferrofluids to subsurface contamination problems include magnetic guidance of reactants to contaminated target zones in the subsurface for in situ treatment or emplacement of containment barriers. Laboratory experiments of magnetically induced ferrofluid flow in porous media in this report demonstrate the potential for mobilizing ferrofluid and controlling fluid emplacement through control of the external magnetic field. The pressures measured in ferrofluid due to the attraction of ferrofluid to a permanent magnet agree well with calculated values. The results show that a predictable pressure gradient is produced in the fluid which is strong near the magnet and drops off quickly with distance. This pressure gradient drives the fluid through sand without significant loss of ferrofluid strength due to filtration or dilution. Flow visualization experiments of ferrofluid in water-filled horizontal Hele-Shaw cells demonstrate that ferrofluid obtains a consistent final arc-shaped configuration around the magnet regardless of initial configuration or flow path toward the magnet. Analogous experiments in actual porous media showed similar features and confirm the ability of ferrofluid to move through porous media by magnetic forces.