A5052606570- Spacecraft and Cryogenic Technologies
- Heat Transfer and Optimization
- Heat Transfer and Boiling Studies
- Rocket and propulsion systems research
- Gas Dynamics and Kinetic Theory
- Heat Transfer Mechanisms
- Induction Heating and Inverter Technology
- Oil and Gas Production Techniques
- Nanofluid Flow and Heat Transfer
- Advanced Thermodynamic Systems and Engines
- Nuclear Materials and Properties
- Fusion materials and technologies
- Microfluidic and Capillary Electrophoresis Applications
- Magnetic Properties and Applications
- Reservoir Engineering and Simulation Methods
- Mechatronics Education and Applications
- Mineral Processing and Grinding
- Particle Accelerators and Free-Electron Lasers
- Industrial Engineering and Technologies
- Metallurgical Processes and Thermodynamics
- Heat and Mass Transfer in Porous Media
- Fluid Dynamics and Vibration Analysis
- Numerical methods in engineering
- Thermal properties of materials
- Fluid Dynamics and Thin Films
GE Global Research (United States)
2025
Los Alamos National Laboratory
2004-2018
University of New Mexico
2007
University of Tennessee at Knoxville
2005
Marquette University
2000-2002
A transient lumped-parameter thermal model of an induction motor is developed. The energy balances and the expressions for appropriate node couplings representing conduction convection heat transfer between nodes, as well capacity each node, are presented. We also present used in a Second Law analysis to calculate entropy generation exergy destruction rates at node. An overall efficiency through then defined. validated by comparing calculated temperatures with experimental data driving...
This work focuses on developing asymptotic approximations for the axially standing waves in porous tubes with arbitrary levels of wall suction. The analysis starts by linearly decomposing Navier–Stokes equations into steady and time-dependent components. part is solved using Berman's similarity transformation, which gives rise to an irrotational mean flow profile, or solving Bragg–Hawthorne equation arrive at inviscid rotational solution. Using Helmholtz theorem, unsteady field further...
An approximate solution to the mathematical model for induction heating of a solid cylinder in cylindrical coil is presented here. The coupled multiphysics includes equations describing electromagnetic field heated object, heat transfer simulation determine temperature and an AC circuit power supply. A multiple-scale perturbation method used solve model. analytical yields simple closed-form expressions generation rate cylinder, equivalent impedance associated tank circuit, frequency response...
A simple model is developed here to predict the pressure drop and discharge coefficient for incompressible flow through orifices with length-to-diameter ratio greater than zero (orifice tubes) over wide ranges of Reynolds number. The orifice tubes represented as two drops in series; namely, a sharp-edged series developing straight length tube. Both these terms are using generally accepted correlations experimental data flows flow. We show agreement between this our numerical analysis laminar...
The laminar oscillatory flow inside a rectangular channel with wall suction is considered here. scope limited to large imposed uniformly along the permeable walls. Inside channel, onset of small amplitude pressure disturbances produces an field that we wish investigate. Based on normalized pressure-wave amplitude, conservation equations are linearized and split into leading-order (steady) first-order (time-dependent) equations. set subdivided acoustic, pressure-driven, wave equation,...
A curved rotating heat pipe for use in motor and generator applications is studied experimentally. The built so that both the condenser evaporator sections are parallel to axis of rotation. section close rotation while can be placed contact with off-axis sources machine. geometry achieved by incorporating an S-shaped curve between on-axis revolving section. allows a direct coupling stationary refrigeration system, allowing intercept An experimental test apparatus was operated. data indicate...
This paper considers the oscillatory motion of gases inside a long porous tube closed-open type. In particular, focus is placed on describing an analytical solution for internal acoustico-vortical coupling that arises in presence appreciable wall suction. unsteady field driven by longitudinal waves are triggered small unavoidable fluctuations suction speed. Under assumption amplitude oscillations, time-dependent governing equations linearized through regular perturbation dependent variables....
The flow of saturated liquid nitrogen through micro-scale orifices has been characterized experimentally. Measurements pressure drop and rate were made with flowing ranging in diameter from 50 micron to 370 micron, orifice length-to-diameter ratios 1.5 10. design the experimental apparatus, instrumentation used, uncertainties are presented. Obstacles encountered while attempting obtain repeatable reliable results at cryogenic temperatures discussed. Finally, experimentally measured discharge...
A curved rotating heat pipe for use in superconducting motor and generator applications is introduced here. The shown here built so that both the condenser evaporator sections are parallel to axis of rotation. section concentric with rotation while can be placed contact off-axis sources machine. geometry achieved by incorporating an S-shaped curve between on-axis revolving section. We show because a sealed, passive transfer device nearly isothermal operation, concept may advantageous when...
Abstract Extending system run life impacts well profitability by cutting artificial lift replacement costs and reducing production losses from downtime. The of Electrical submersible pumping (ESP) motor can be increased the operating temperature motor. On other hand, cooler-running motors used for high-temperature wells, where downhole temperatures may a limiting factor. Controlling is important increasing ESP as plays key role in failures. Power were analyzed various conditions. are source...
*† ‡ A test apparatus, that will be used to study the heat transfer performance of rotating pipes, has been designed and built. The apparatus allows for simultaneous testing a pair crank-shaped pipes operating near room temperature. rig is support with an on-axis condenser section, off-axis eccentrically evaporator curved adiabatic section. Due length (55”), distance from axis rotation section (9.5”), maximum speed (5500 rpm), care had taken in design substantial structure selection drive...