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Walker, D. Greg
Associate Professor of Mechanical Engineering

Research Information

Our mission is to explore the physical effects of energy transport particularly in nanoscale structures to obtain a better understanding of the physical world that can lead to engineering discoveries in energy applications.

One focus is in microscale energy transport in semiconductor devices designed for energy conversion. This includes thermoelectric devices, solar cells, and fuel cells, for example. We also study fundamental artifacts of small scale transport such as thermal rectification, interfacial conductance and nanofluid convection.

A second focus area is in heat flux measurement using thermographic phosphors and ultrasonic approaches. Our techniques have been applied to gun barrels, aerospace testing in wind tunnels and combustion chambers.

Research Interests include: Electro-thermal simulation of semiconductor devices, microscale heat transfer and energy transport, microrefrigeration and energy conversion, MEMS, inverse and parameter estimation methods, heat flux measurement, scientific computational methods, software integration architectures.


Selected Publications

A review of thermal rectification observations and models in solid materials. Roberts, NA; Walker, DG, INTERNATIONAL JOURNAL OF THERMAL SCIENCES, 50, 648-662 , (2011)

Convective Performance of Nanofluids in Commercial Electronics Cooling Systems. Roberts, NA; Walker, DG, APPLIED THERMAL ENGINEERING, 30, 2499-2504 , (2010)

Emission lifetimes of europium-doped pyrochlores for phosphor thermometry. Hansel, RA; Desai, SK; Allison, SW; Heyes, AL; Walker, DG, JOURNAL OF APPLIED PHYSICS, 107, 016101 , (2010)

Parallelized Direct Search of a Binary Objective. Grant, P; Walker, DG, JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING, 10, 044502 , (2010)

Phonon wave-packet simulations of Ar/Kr interfaces for thermal rectification. Roberts, NA; Walker, DG, JOURNAL OF APPLIED PHYSICS, 108, 123515 , (2010)

Transport involving conducting fibers in a non-conducting matrix. Hansel, RA; Rozen, J; Walker, DG, INTERNATIONAL JOURNAL OF THERMAL SCIENCES, 49, 1561-1566 , (2010)

Molecular dynamics simulation of thermal conductivity of nanocrystalline composite films. Roberts, NA; Walker, DG; Li, DY, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 52, 2002-2008 , (2009)

Temperature-dependent fluorescence decay lifetimes of the phosphor Y-3(Al0.5Ga0.5)(5)O-12:Ce 1%. Allison, SW; Buczyna, JR; Hansel, RA; Walker, DG; Gillies, GT, JOURNAL OF APPLIED PHYSICS, 105, 036105 , (2009)

Temperature-dependent luminescence of Ce3+ in gallium-substituted garnets. Hansel, RA; Allison, SW; Walker, DG, APPLIED PHYSICS LETTERS, 95, 114102 , (2009)

Temperature-dependent luminescence of gallium-substituted YAG:Ce. Hansel, RA; Allison, SW; Walker, DG, JOURNAL OF MATERIALS SCIENCE, 45, 146 , (2009)

Case study on the perception of learning when tablet PCs are used as a presentation medium in engineering classrooms. Walker, DG; Stremler, MA; Johnston, J; Bruff, D; Brophy, SP, INTERNATIONAL JOURNAL OF ENGINEERING EDUCATION, 24, 606-615 , (2008)

One-dimensional thin-film phonon transport with generation. Bulusu, A; Walker, DG, MICROELECTRONICS JOURNAL, 39, 950-956 , (2008)

Quantum modeling of thermoelectric properties of Si/Ge/Si superlattices. Bulusu, A; Walker, DG, IEEE TRANSACTIONS ON ELECTRON DEVICES, 55, 423-429 , (2008)

Review of electronic transport models for thermoelectric materials. Bulusu, A; Walker, DG, SUPERLATTICES AND MICROSTRUCTURES, 44, , (2008)

Enhancing performance of thermoelectric coolers through the application of distributed control. Harvey, RD; Walker, DG; Frampton, KD, IEEE TRANSACTIONS ON COMPONENTS AND PACKAGING TECHNOLOGIES, 30, 330-336 , (2007)

Modeling of thermoelectric properties of semi-conductor thin films with quantum and scattering effects. Bulusu, A; Walker, DG, JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 129, 492-499 , (2007)

Quantum modeling of thermoelectric performance of strained Si/Ge/Si superlattices using the nonequilibrium Green's function method. Bulusu, A; Walker, DG, JOURNAL OF APPLIED PHYSICS, 102, 073713 , (2007)

Transient measurements using thermographic phosphors. Walker, DG; Allison, SW, ISA TRANSACTIONS, 46, 15-20 , (2007)

Single event burnout in power diodes: Mechanisms and models. Albadri, AM; Schrimpf, RD; Galloway, KF; Walker, DG, MICROELECTRONICS RELIABILITY, 46, 317-325 , (2006)

Coupled electro-thermal simulations of single event burnout in power diodes. Albadri, AM; Schrimpf, RD; Walker, DG; Mahajan, SV, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 52, 2194-2199 , (2005)

Estimation of parameters in thermal-field emission from diamond. Walker, DG; Harris, CT; Fisher, TS; Davidson, JL, DIAMOND AND RELATED MATERIALS, 14, 113-120 , (2005)

Heat flux determination from measured heating rates using thermographic phosphors. Walker, DG, JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 127, 560-570 , (2005)

Experimental characterization of anode heating due to electron field emission. Harris, CT; Walker, DG; Fisher, TS; Hofmeister, WH, MICROSCALE THERMOPHYSICAL ENGINEERING, 8, 101-109 , (2004)

Phonon production and nonequilibrium transport from ion strikes. Walker, DG; Weller, RA, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 51, 3318-3323 , (2004)

Simulation of field-emitted electron trajectories and transport from carbon nanotubes. Walker, DG; Zhang, W; Fisher, TS, JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 22, 1101-1107 , (2004)

Analysis and simulation of anode heating due to electron field emission. Fisher, TS; Walker, DG; Weller, RA, IEEE TRANSACTIONS ON COMPONENTS AND PACKAGING TECHNOLOGIES, 26, 317-323 , (2003)

High-temperature electron emission from diamond films. Shin, SH; Fisher, TS; Walker, DG; Strauss, AM; Kang, WP; Davidson, JL, JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 21, 587-592 , (2003)

Non-equilibrium thermal effects in SOI power transistors. Raman, A; Walker, DG; Fisher, TS, SOLID-STATE ELECTRONICS, 47, 1265-1273 , (2003)

Simulation of nonequilibrium thermal effects in power LDMOS transistors. Raman, A; Walker, DG; Fisher, TS, SOLID-STATE ELECTRONICS, 47, 1265-1273 , (2003)

Thermal and electrical energy transport and conversion in nanoscale electron field emission processes. Fisher, TS; Walker, DG, JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 124, 954-962 , (2002)

Thermal modeling of single event burnout failure in semiconductor power devices. Walker, DG; Fisher, TS; Liu, J; Schrimpf, RD, MICROELECTRONICS RELIABILITY, 41, 571-578 , (2001)

Phone: 615-343-6959
Email: greg.walker@vanderbilt.edu
Website: Click to Visit

 
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