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Cullen R. Buie. Gilson, Laura (Laura Marie) Massachusetts Institute of Technology. Department of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2016-07-01T18:42:25Z 2016-07-01T18:42:25Z 2016 2016 http://hdl.handle.net/1721.1/103462 952187447 Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016. Cataloged from PDF version of thesis. Includes bibliographical references (pages 63-64). The hydrogen bromine laminar flow battery is a promising technology for grid-scale energy storage. It dispenses with the expensive membrane used in traditional flow batteries, instead using laminar flow to maintain the separation of fluid streams. It also takes advantage of powerful, inexpensive chemical reactants. However, mixing between the fluid streams within the battery reduces its single-pass performance and cyclability. Conditions at the inlet junction where oxidant and electrolyte streams come together are thought to influence mixing. This work investigates the relationship between fluid flow at the inlet junction, mixing, and battery performance. Matching electrolyte- and oxidant-stream flow rates or velocities is predicted to cause less mixing than employing hydrodynamic focusing of the oxidant stream. When hydrodynamic focusing is used in channels with heights on the order 500 [mu]m or less, numerical simulations show recirculating flows at the inlet junction and experimental results show a decrease in limiting current. However, for matching inlet velocities or flow rates experimental results show limiting current consistent with predictions that assume no mixing. This result shows a path forward achieving higher power density in the hydrogen bromine laminar flow battery by prioritizing symmetry of the inlet flow conditions as the channel height is decreased. by Laura M. Gilson. S.M. 64 pages eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. Mitigation of losses from hydrodynamic mixing in a hydrogen bromine Laminar flow battery Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="fe8b9b12-2e12-42b0-af47-e44fc0e4f468"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Mitigation of losses from hydrodynamic mixing in a hydrogen bromine Laminar flow battery</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2016</PublicationDate> <Authors> <Author> <DisplayName>Gilson, Laura (Laura Marie)</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering.</Keyword> <Abstract>The hydrogen bromine laminar flow battery is a promising technology for grid-scale energy storage. It dispenses with the expensive membrane used in traditional flow batteries, instead using laminar flow to maintain the separation of fluid streams. It also takes advantage of powerful, inexpensive chemical reactants. However, mixing between the fluid streams within the battery reduces its single-pass performance and cyclability. Conditions at the inlet junction where oxidant and electrolyte streams come together are thought to influence mixing. This work investigates the relationship between fluid flow at the inlet junction, mixing, and battery performance. Matching electrolyte- and oxidant-stream flow rates or velocities is predicted to cause less mixing than employing hydrodynamic focusing of the oxidant stream. When hydrodynamic focusing is used in channels with heights on the order 500 [mu]m or less, numerical simulations show recirculating flows at the inlet junction and experimental results show a decrease in limiting current. However, for matching inlet velocities or flow rates experimental results show limiting current consistent with predictions that assume no mixing. This result shows a path forward achieving higher power density in the hydrogen bromine laminar flow battery by prioritizing symmetry of the inlet flow conditions as the channel height is decreased.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>