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Full-Text Articles in Engineering
Lumped Parameter, State Variable Dynamic Models For U-Tube Recirculation Type Nuclear Steam Generators, Mohamed Rabie Ahmed Ali
Lumped Parameter, State Variable Dynamic Models For U-Tube Recirculation Type Nuclear Steam Generators, Mohamed Rabie Ahmed Ali
Doctoral Dissertations
A number of lumped parameter dynamic models were developed for a vertical U-tube recirculation steam generator (UTSG) of the type used in most pressurized water reactor nuclear steam supply systems.
The models ranged in complexity from a simplified model (Model A) with only three lumps to represent the primary fluid (reactor coolant), tube metal and the secondary fluid to a detailed model (Model D) with fourteen lumps and a moving boundary between the subcooled and boiling sections of the heat exchange region. The models are linear and are in the state variable form which is convenient for using standard general …
Rheology, Dynamics And Structure Development During Melt Spinning Of Nylon-6, Vilas G. Bankar
Rheology, Dynamics And Structure Development During Melt Spinning Of Nylon-6, Vilas G. Bankar
Doctoral Dissertations
A comprehensive study of melt spinning dynamics and structure development of nylon-6 was performed. The major emphasis of the research consisted of on-line rheological and morphological measurements. These included diameter, temperature and tension measurements of the fiber as well as x-ray diffraction and birefringence measurements. The effects of annealing spun fibers in air, water and 20 percent formic acid solution were also studied. Tensile properties of spun fibers were measured and related to the spinning variables and structural characteristics.
In the rheological portion of the work, the shear viscosity and the normal stresses in nylon-6 melts were measured. Nylon-6 melt …