Wisconsin Discovery Portal

Researcher's Profile

Last Name

Nellis 

First Name

Gregory 

Middle Initial

Areas of Research Expertise

* Cryogenic refrigeration systems including mixed gas JT systems, reverse-Brayton systems , pulse-tubes, and hybrid cryocoolers
* Thermal-fluid problems in semiconductor manufacturing including immersion lithography, EUV lithography, and nanoimprint
* Vortex tube theory and application
* Refrigeration technology
* Gas bearing supported turbomachinery

Web site

Gregory Nellis' University Webpage 

Curriculum Vitae (CV)

 

Current/Active Funding

  • DOD, Navy, 2008-2012, Fundamental Challenges for Low Temperature Pulse Tubes
  • DOE, 2010-2013, ARRA Optimization of Regenerators for AMRR Systems
  • Strategic polymer Sciences, 2010-2012, Development of Electrocaloric Cooling Systems

Issued Patent(s)

  • 7,789,371 - Low-power piezoelectric micro-machined valve, granted Sept 2010.

USPTO Published Applications

Recent Publication(s)

  • "Experimental evaluation of an adaptive Joule-Thomson cooling system including silicon-microfabricated heat exchanger and microvalve components"

Zhu WB, Park JM, White MJ et al., Journal of Vacuum Science & Technology A 29 (2): Mar-Apr 2011. This article reports the evaluation of a Joule-Thomson (JT) cooling system that combines two custom micromachined components-a Si/glass-stack recuperative heat exchanger and a piezoelectrically actuated expansion microvalve.

  • "An Experimentally Validated Numerical Modeling Technique for Perforated Plate Heat Exchangers"

White MJ, Nellis GF, Klein SA, et al., Journal of Heat Transfer 132 (11): 111801 Nov 2010.  This paper presents a numerical model of a perforated plate heat exchanger that accounts for axial conduction, external parasitic heat loads, variable fluid and material properties, and conduction to and from the ends of the heat exchanger.

  • "A Si/glass bulk-micromachined cryogenic heat exchanger for high heat loads: fabrication, test and application results"

Zhu WB, White MJ, Nellis GF, et al., Journal of Microelectromechanical Systems 19 (1): 38-47 Feb 2010. This paper reports on amicromachined Si/glass stack recuperative heat exchanger with in situ temperature sensors.

  • "A microvalve with integrated sensors and customizable normal state for low-temperature operation"

Park JM, Evans AT, Rasmussen K, et al., Journal of Microelectromechanical systems 18 (4): 868-877 Aug 2009. This paper reports on design, fabrication, and testing of a piezoelectrically actuated microvalve with integrated sensors for flow modulation at low temperatures. One envisioned application is to control the flow of a cryogen for distributed cooling with a high degree of temperature stability and a small thermal gradient.

Recent Artistic Works

 

Collaboration

 

Research Tools

 

Research Facilities

  • Computational Mechanics Center
  • Solar Energy Laboratory

E-mail Address

gfnellis@engr.wisc.edu 

Phone Number

(608) 265-6626 

Current University

UW - Madison 

Department

Mechanical Engineering 

Title

Associate Professor 

Other Appointments

 

Address Line 1

1339 Engineering Research Building 

Address Line 2

1500 Engineering Drive 

City

Madison 

State

WI 

Zip Code

53706 

Bachelor's Degree

BS, University of Wisconsin-Madison, Mechanical Engineering, 1992

Master's Degree

MS, Massachusetts Institute of Technology, Mechanical Engineering, 1995

PhD

PhD, Massachusetts Institute of Technology, Mechanical Engineering, 1997

Other Degrees

 

Technologies Available for Licensing

Attachments
Created at 7/19/2007 2:53 PM  by Mindy Dawson 
Last modified at 11/7/2011 11:28 AM  by EXTWEB\rshea