Molecular physics of jumping nanodroplets
Next-generation processor-chip cooling devices and self-cleaning surfaces can be enhanced by a passive process that requires little to no electrical input, through coalescence-induced nanodroplet jumping. Here, we describe the crucial impact thermal capillary waves and ambient gas rarefaction have o...
Gespeichert in:
Veröffentlicht in: | Nanoscale 2020-10, Vol.12 (4), p.2631-2637 |
---|---|
Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
container_end_page | 2637 |
---|---|
container_issue | 4 |
container_start_page | 2631 |
container_title | Nanoscale |
container_volume | 12 |
creator | Perumanath, Sreehari Borg, Matthew K Sprittles, James E Enright, Ryan |
description | Next-generation processor-chip cooling devices and self-cleaning surfaces can be enhanced by a passive process that requires little to no electrical input, through coalescence-induced nanodroplet jumping. Here, we describe the crucial impact thermal capillary waves and ambient gas rarefaction have on enhancing/limiting the jumping speeds of nanodroplets on low adhesion surfaces. By using high-fidelity non-equilibrium molecular dynamics simulations in conjunction with well-resolved volume-of-fluid continuum calculations, we are able to quantify the different dissipation mechanisms that govern nanodroplet jumping at length scales that are currently difficult to access experimentally. We find that interfacial thermal capillary waves contribute to a large statistical spread of nanodroplet jumping speeds that range from 0-30 m s
−1
, where the typical jumping speeds of micro/millimeter sized droplets are only up to a few m s
−1
. As the gas surrounding these liquid droplets is no longer in thermodynamic equilibrium, we also show how the reduced external drag leads to increased jumping speeds. This work demonstrates that, in the viscous-dominated regime, the Ohnesorge number and viscosity ratio between the two phases alone are not sufficient, but that the thermal fluctuation number (Th) and the Knudsen number (Kn) are both needed to recover the relevant molecular physics at nanoscales. Our results and analysis suggest that these dimensionless parameters would be relevant for many other free-surface flow processes and applications that operate at the nanoscale.
Quantifying the influence of thermal fluctuations and extreme rarefaction on nanodroplet jumping reveals their relevance to other nanoscale flow processes. |
doi_str_mv | 10.1039/d0nr03766d |
format | Article |
fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_2432859717</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2452988791</sourcerecordid><originalsourceid>FETCH-LOGICAL-c376t-2fbc8ad886867dae0553420ee3e7b7210381d10fac29a3d8d8c7a85f36f6c08a3</originalsourceid><addsrcrecordid>eNp90E1LxDAQBuAgCq6rF-9CxYsK1UnSJulRdv2CVUH0HLL50C7dpibtYf-90ZUVPHiaOTzMvLwIHWK4wECrSwNtAMoZM1toRKCAnFJOtjc7K3bRXowLAFZRRkfo7ME3Vg-NCln3voq1jpl32WJYdnX7lrWq9Sb4rrF93Ec7TjXRHvzMMXq9uX6Z3OWzp9v7ydUs1-lvnxM310IZIZhg3CgLZUkLAtZSy-ecpJQCGwxOaVIpaoQRmitROsoc0yAUHaPT9d0u-I_Bxl4u66ht06jW-iFKUlAiyopjnujJH7rwQ2hTuqRKUgnBK5zU-Vrp4GMM1sku1EsVVhKD_GpNTuHx-bu1acLHaxyi3rjfVmVnXDJH_xn6CdIic1E</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2452988791</pqid></control><display><type>article</type><title>Molecular physics of jumping nanodroplets</title><source>Royal Society Of Chemistry Journals 2008-</source><creator>Perumanath, Sreehari ; Borg, Matthew K ; Sprittles, James E ; Enright, Ryan</creator><creatorcontrib>Perumanath, Sreehari ; Borg, Matthew K ; Sprittles, James E ; Enright, Ryan</creatorcontrib><description>Next-generation processor-chip cooling devices and self-cleaning surfaces can be enhanced by a passive process that requires little to no electrical input, through coalescence-induced nanodroplet jumping. Here, we describe the crucial impact thermal capillary waves and ambient gas rarefaction have on enhancing/limiting the jumping speeds of nanodroplets on low adhesion surfaces. By using high-fidelity non-equilibrium molecular dynamics simulations in conjunction with well-resolved volume-of-fluid continuum calculations, we are able to quantify the different dissipation mechanisms that govern nanodroplet jumping at length scales that are currently difficult to access experimentally. We find that interfacial thermal capillary waves contribute to a large statistical spread of nanodroplet jumping speeds that range from 0-30 m s
−1
, where the typical jumping speeds of micro/millimeter sized droplets are only up to a few m s
−1
. As the gas surrounding these liquid droplets is no longer in thermodynamic equilibrium, we also show how the reduced external drag leads to increased jumping speeds. This work demonstrates that, in the viscous-dominated regime, the Ohnesorge number and viscosity ratio between the two phases alone are not sufficient, but that the thermal fluctuation number (Th) and the Knudsen number (Kn) are both needed to recover the relevant molecular physics at nanoscales. Our results and analysis suggest that these dimensionless parameters would be relevant for many other free-surface flow processes and applications that operate at the nanoscale.
Quantifying the influence of thermal fluctuations and extreme rarefaction on nanodroplet jumping reveals their relevance to other nanoscale flow processes.</description><identifier>ISSN: 2040-3364</identifier><identifier>EISSN: 2040-3372</identifier><identifier>DOI: 10.1039/d0nr03766d</identifier><language>eng</language><publisher>Cambridge: Royal Society of Chemistry</publisher><subject>Capillary waves ; Coalescing ; Dimensionless analysis ; Drag reduction ; Droplets ; Free surfaces ; Microprocessors ; Molecular dynamics ; Molecular physics ; Rarefaction ; Thermodynamic equilibrium ; Viscosity ratio</subject><ispartof>Nanoscale, 2020-10, Vol.12 (4), p.2631-2637</ispartof><rights>Copyright Royal Society of Chemistry 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c376t-2fbc8ad886867dae0553420ee3e7b7210381d10fac29a3d8d8c7a85f36f6c08a3</citedby><cites>FETCH-LOGICAL-c376t-2fbc8ad886867dae0553420ee3e7b7210381d10fac29a3d8d8c7a85f36f6c08a3</cites><orcidid>0000-0002-0455-2756 ; 0000-0002-7740-1932 ; 0000-0002-3911-6292 ; 0000-0002-4169-6468</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Perumanath, Sreehari</creatorcontrib><creatorcontrib>Borg, Matthew K</creatorcontrib><creatorcontrib>Sprittles, James E</creatorcontrib><creatorcontrib>Enright, Ryan</creatorcontrib><title>Molecular physics of jumping nanodroplets</title><title>Nanoscale</title><description>Next-generation processor-chip cooling devices and self-cleaning surfaces can be enhanced by a passive process that requires little to no electrical input, through coalescence-induced nanodroplet jumping. Here, we describe the crucial impact thermal capillary waves and ambient gas rarefaction have on enhancing/limiting the jumping speeds of nanodroplets on low adhesion surfaces. By using high-fidelity non-equilibrium molecular dynamics simulations in conjunction with well-resolved volume-of-fluid continuum calculations, we are able to quantify the different dissipation mechanisms that govern nanodroplet jumping at length scales that are currently difficult to access experimentally. We find that interfacial thermal capillary waves contribute to a large statistical spread of nanodroplet jumping speeds that range from 0-30 m s
−1
, where the typical jumping speeds of micro/millimeter sized droplets are only up to a few m s
−1
. As the gas surrounding these liquid droplets is no longer in thermodynamic equilibrium, we also show how the reduced external drag leads to increased jumping speeds. This work demonstrates that, in the viscous-dominated regime, the Ohnesorge number and viscosity ratio between the two phases alone are not sufficient, but that the thermal fluctuation number (Th) and the Knudsen number (Kn) are both needed to recover the relevant molecular physics at nanoscales. Our results and analysis suggest that these dimensionless parameters would be relevant for many other free-surface flow processes and applications that operate at the nanoscale.
Quantifying the influence of thermal fluctuations and extreme rarefaction on nanodroplet jumping reveals their relevance to other nanoscale flow processes.</description><subject>Capillary waves</subject><subject>Coalescing</subject><subject>Dimensionless analysis</subject><subject>Drag reduction</subject><subject>Droplets</subject><subject>Free surfaces</subject><subject>Microprocessors</subject><subject>Molecular dynamics</subject><subject>Molecular physics</subject><subject>Rarefaction</subject><subject>Thermodynamic equilibrium</subject><subject>Viscosity ratio</subject><issn>2040-3364</issn><issn>2040-3372</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp90E1LxDAQBuAgCq6rF-9CxYsK1UnSJulRdv2CVUH0HLL50C7dpibtYf-90ZUVPHiaOTzMvLwIHWK4wECrSwNtAMoZM1toRKCAnFJOtjc7K3bRXowLAFZRRkfo7ME3Vg-NCln3voq1jpl32WJYdnX7lrWq9Sb4rrF93Ec7TjXRHvzMMXq9uX6Z3OWzp9v7ydUs1-lvnxM310IZIZhg3CgLZUkLAtZSy-ecpJQCGwxOaVIpaoQRmitROsoc0yAUHaPT9d0u-I_Bxl4u66ht06jW-iFKUlAiyopjnujJH7rwQ2hTuqRKUgnBK5zU-Vrp4GMM1sku1EsVVhKD_GpNTuHx-bu1acLHaxyi3rjfVmVnXDJH_xn6CdIic1E</recordid><startdate>20201022</startdate><enddate>20201022</enddate><creator>Perumanath, Sreehari</creator><creator>Borg, Matthew K</creator><creator>Sprittles, James E</creator><creator>Enright, Ryan</creator><general>Royal Society of Chemistry</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>JG9</scope><scope>L7M</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0002-0455-2756</orcidid><orcidid>https://orcid.org/0000-0002-7740-1932</orcidid><orcidid>https://orcid.org/0000-0002-3911-6292</orcidid><orcidid>https://orcid.org/0000-0002-4169-6468</orcidid></search><sort><creationdate>20201022</creationdate><title>Molecular physics of jumping nanodroplets</title><author>Perumanath, Sreehari ; Borg, Matthew K ; Sprittles, James E ; Enright, Ryan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c376t-2fbc8ad886867dae0553420ee3e7b7210381d10fac29a3d8d8c7a85f36f6c08a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Capillary waves</topic><topic>Coalescing</topic><topic>Dimensionless analysis</topic><topic>Drag reduction</topic><topic>Droplets</topic><topic>Free surfaces</topic><topic>Microprocessors</topic><topic>Molecular dynamics</topic><topic>Molecular physics</topic><topic>Rarefaction</topic><topic>Thermodynamic equilibrium</topic><topic>Viscosity ratio</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Perumanath, Sreehari</creatorcontrib><creatorcontrib>Borg, Matthew K</creatorcontrib><creatorcontrib>Sprittles, James E</creatorcontrib><creatorcontrib>Enright, Ryan</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>Nanoscale</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Perumanath, Sreehari</au><au>Borg, Matthew K</au><au>Sprittles, James E</au><au>Enright, Ryan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Molecular physics of jumping nanodroplets</atitle><jtitle>Nanoscale</jtitle><date>2020-10-22</date><risdate>2020</risdate><volume>12</volume><issue>4</issue><spage>2631</spage><epage>2637</epage><pages>2631-2637</pages><issn>2040-3364</issn><eissn>2040-3372</eissn><abstract>Next-generation processor-chip cooling devices and self-cleaning surfaces can be enhanced by a passive process that requires little to no electrical input, through coalescence-induced nanodroplet jumping. Here, we describe the crucial impact thermal capillary waves and ambient gas rarefaction have on enhancing/limiting the jumping speeds of nanodroplets on low adhesion surfaces. By using high-fidelity non-equilibrium molecular dynamics simulations in conjunction with well-resolved volume-of-fluid continuum calculations, we are able to quantify the different dissipation mechanisms that govern nanodroplet jumping at length scales that are currently difficult to access experimentally. We find that interfacial thermal capillary waves contribute to a large statistical spread of nanodroplet jumping speeds that range from 0-30 m s
−1
, where the typical jumping speeds of micro/millimeter sized droplets are only up to a few m s
−1
. As the gas surrounding these liquid droplets is no longer in thermodynamic equilibrium, we also show how the reduced external drag leads to increased jumping speeds. This work demonstrates that, in the viscous-dominated regime, the Ohnesorge number and viscosity ratio between the two phases alone are not sufficient, but that the thermal fluctuation number (Th) and the Knudsen number (Kn) are both needed to recover the relevant molecular physics at nanoscales. Our results and analysis suggest that these dimensionless parameters would be relevant for many other free-surface flow processes and applications that operate at the nanoscale.
Quantifying the influence of thermal fluctuations and extreme rarefaction on nanodroplet jumping reveals their relevance to other nanoscale flow processes.</abstract><cop>Cambridge</cop><pub>Royal Society of Chemistry</pub><doi>10.1039/d0nr03766d</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0002-0455-2756</orcidid><orcidid>https://orcid.org/0000-0002-7740-1932</orcidid><orcidid>https://orcid.org/0000-0002-3911-6292</orcidid><orcidid>https://orcid.org/0000-0002-4169-6468</orcidid><oa>free_for_read</oa></addata></record> |
fulltext | fulltext |
identifier | ISSN: 2040-3364 |
ispartof | Nanoscale, 2020-10, Vol.12 (4), p.2631-2637 |
issn | 2040-3364 2040-3372 |
language | eng |
recordid | cdi_proquest_miscellaneous_2432859717 |
source | Royal Society Of Chemistry Journals 2008- |
subjects | Capillary waves Coalescing Dimensionless analysis Drag reduction Droplets Free surfaces Microprocessors Molecular dynamics Molecular physics Rarefaction Thermodynamic equilibrium Viscosity ratio |
title | Molecular physics of jumping nanodroplets |
url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-25T08%3A13%3A17IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Molecular%20physics%20of%20jumping%20nanodroplets&rft.jtitle=Nanoscale&rft.au=Perumanath,%20Sreehari&rft.date=2020-10-22&rft.volume=12&rft.issue=4&rft.spage=2631&rft.epage=2637&rft.pages=2631-2637&rft.issn=2040-3364&rft.eissn=2040-3372&rft_id=info:doi/10.1039/d0nr03766d&rft_dat=%3Cproquest_cross%3E2452988791%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2452988791&rft_id=info:pmid/&rfr_iscdi=true |