Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for +publisher:"Virginia Tech" +contributor:("Mukherjee, Partha P."). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Virginia Tech

1. Regner, Keith Thomas. Combining In Situ Measurements and Advanced Catalyst Layer Modeling in PEM Fuel Cells.

Degree: MS, Mechanical Engineering, 2011, Virginia Tech

Catalyst layer modeling can be a useful tool for fuel cell design. By comparing numerical results to experimental results, numerical models can provide a better understanding of the physical processes occurring within the fuel cell catalyst layer. This can lead to design optimization and cost reduction. The purpose of this research was to compare, for the first time, a direct numerical simulation (DNS) model for the cathode catalyst layer of a PEM fuel cell to a newly developed experimental technique that measures the ionic potential through the length of the catalyst layer. A new design for a microstructured electrode scaffold (MES) is proposed and implemented. It was found that there is a 25%-27% difference between the model and the experimental measurements. Case studies were also performed with the DNS to compare the effects of different operating conditions, specifically temperature and relative humidity, and different reconstructed microstructures. Suggested operating parameters are proposed for the best comparison between numerical and experimental results. Recommendations for microstructure reconstruction, MES construction and design, and potential measurement techniques are also given. Advisors/Committee Members: Ellis, Michael W. (committeechair), Mukherjee, Partha P. (committee member), von Spakovsky, Michael R. (committee member).

Subjects/Keywords: Measurement; DNS; Through-Plane Transport; Catalyst Layer; PEM Fuel Cell

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Regner, K. T. (2011). Combining In Situ Measurements and Advanced Catalyst Layer Modeling in PEM Fuel Cells. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/34978

Chicago Manual of Style (16th Edition):

Regner, Keith Thomas. “Combining In Situ Measurements and Advanced Catalyst Layer Modeling in PEM Fuel Cells.” 2011. Masters Thesis, Virginia Tech. Accessed December 05, 2019. http://hdl.handle.net/10919/34978.

MLA Handbook (7th Edition):

Regner, Keith Thomas. “Combining In Situ Measurements and Advanced Catalyst Layer Modeling in PEM Fuel Cells.” 2011. Web. 05 Dec 2019.

Vancouver:

Regner KT. Combining In Situ Measurements and Advanced Catalyst Layer Modeling in PEM Fuel Cells. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/10919/34978.

Council of Science Editors:

Regner KT. Combining In Situ Measurements and Advanced Catalyst Layer Modeling in PEM Fuel Cells. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/34978


Virginia Tech

2. Radhakrishnan, Karthik Narayanan. Evaluation of the Cycle Profile Effect on the Degradation of Commercial Lithium Ion Batteries.

Degree: PhD, Mechanical Engineering, 2017, Virginia Tech

Major vehicle manufacturers are committed to expand their electrified vehicle fleet in upcoming years to meet fuel efficiency goals. Understanding the effect of the charge/discharge cycle profiles on battery durability is important to the implementation of batteries in electrified vehicles and to the design of appropriate battery testing protocols. In this work, commercial lithium ion cells were tested using two profiles with the same energy transfer; a pulse-heavy profile to simulate on-road conditions for a typical hybrid electric vehicle, and a simplified square-wave profile with the same charge flow as the pulse-heavy profile, but with lower currents. Cycling tests on coin cells with similar electrode chemistries as well as development of a first principles, physics based model were done in order to understand the underlying cause of the degradation. The results suggest that the degradation observed is not dependent on the type of profile used. These results also indicate that for high power cells, the capacity degradation associated with the charge-sustaining mode of operation can be studied with relatively simple approximations of complex drive cycles. Advisors/Committee Members: Ellis, Michael W. (committeechair), Nelson, Douglas J. (committee member), von Spakovsky, Michael R. (committee member), Moore, Robert B. (committee member), Mukherjee, Partha P. (committee member).

Subjects/Keywords: Lithium ion batteries; capacity degradation; cycle profile

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Radhakrishnan, K. N. (2017). Evaluation of the Cycle Profile Effect on the Degradation of Commercial Lithium Ion Batteries. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/84420

Chicago Manual of Style (16th Edition):

Radhakrishnan, Karthik Narayanan. “Evaluation of the Cycle Profile Effect on the Degradation of Commercial Lithium Ion Batteries.” 2017. Doctoral Dissertation, Virginia Tech. Accessed December 05, 2019. http://hdl.handle.net/10919/84420.

MLA Handbook (7th Edition):

Radhakrishnan, Karthik Narayanan. “Evaluation of the Cycle Profile Effect on the Degradation of Commercial Lithium Ion Batteries.” 2017. Web. 05 Dec 2019.

Vancouver:

Radhakrishnan KN. Evaluation of the Cycle Profile Effect on the Degradation of Commercial Lithium Ion Batteries. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/10919/84420.

Council of Science Editors:

Radhakrishnan KN. Evaluation of the Cycle Profile Effect on the Degradation of Commercial Lithium Ion Batteries. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/84420

.