Flow boiling of R245fa in a microgap with staggered circular cylindrical pin fins
•Investigation of flow boiling of R245fa refrigerant in a microgap populated with cylindrical circular cylindrical pin fins, for a wide range of mass flux and heat flux.•High speed visualization of flow regimes, including bubbly and foggy.•Comprehensive analysis of single-phase and two-phase average...
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| Veröffentlicht in: | International journal of heat and mass transfer 2018-06, Vol.121, p.329-342 |
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| container_title | International journal of heat and mass transfer |
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| creator | Asrar, Pouya Zhang, Xuchen Green, Craig E. Bakir, Muhannad Joshi, Yogendra K. |
| description | •Investigation of flow boiling of R245fa refrigerant in a microgap populated with cylindrical circular cylindrical pin fins, for a wide range of mass flux and heat flux.•High speed visualization of flow regimes, including bubbly and foggy.•Comprehensive analysis of single-phase and two-phase average heat transfer coefficient, and comparison with an existing literature.•Ability to run two-phase flow experiments in a 200 μm microgap at pressures as high as 2 MPa.
In this study, flow boiling of refrigerant R245fa is investigated in a microgap of height 200 μm populated with a staggered pin fin array of diameter 150 μm and spacing 200 μm. For heat fluxes up to 498 W/cm2, mass flux values up to 7896 kg/m2 s, and inlet temperatures of 13 °C and 18 °C, average two-phase heat transfer coefficient up to 60 kW/m2 K are measured. High speed flow visualizations at frame rate of 2229 fps elucidate the flow boiling patterns inside the microgaps, including bubbly and foggy that are generated in the pin finned area. Surface temperatures are measured for heat fluxes up to 498 W/cm2 which enable determination of heat transfer characteristics. |
| doi_str_mv | 10.1016/j.ijheatmasstransfer.2017.12.117 |
| format | Article |
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In this study, flow boiling of refrigerant R245fa is investigated in a microgap of height 200 μm populated with a staggered pin fin array of diameter 150 μm and spacing 200 μm. For heat fluxes up to 498 W/cm2, mass flux values up to 7896 kg/m2 s, and inlet temperatures of 13 °C and 18 °C, average two-phase heat transfer coefficient up to 60 kW/m2 K are measured. High speed flow visualizations at frame rate of 2229 fps elucidate the flow boiling patterns inside the microgaps, including bubbly and foggy that are generated in the pin finned area. Surface temperatures are measured for heat fluxes up to 498 W/cm2 which enable determination of heat transfer characteristics.</description><identifier>ISSN: 0017-9310</identifier><identifier>EISSN: 1879-2189</identifier><identifier>DOI: 10.1016/j.ijheatmasstransfer.2017.12.117</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Flow boiling ; Fluid mechanics ; Heat exchangers ; Heat flux ; Heat transfer ; Heat transfer coefficients ; Microgap ; Phase transitions ; Pin fins ; Two-phase flow ; Two-phase heat transfer</subject><ispartof>International journal of heat and mass transfer, 2018-06, Vol.121, p.329-342</ispartof><rights>2018 Elsevier Ltd</rights><rights>Copyright Elsevier BV Jun 2018</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c370t-ac5b0dd3b59f61c7674d516b26941d00e23bb8afc62c6aa7934b70c93364b1773</citedby><cites>FETCH-LOGICAL-c370t-ac5b0dd3b59f61c7674d516b26941d00e23bb8afc62c6aa7934b70c93364b1773</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0017931017334968$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3536,27903,27904,65309</link.rule.ids></links><search><creatorcontrib>Asrar, Pouya</creatorcontrib><creatorcontrib>Zhang, Xuchen</creatorcontrib><creatorcontrib>Green, Craig E.</creatorcontrib><creatorcontrib>Bakir, Muhannad</creatorcontrib><creatorcontrib>Joshi, Yogendra K.</creatorcontrib><title>Flow boiling of R245fa in a microgap with staggered circular cylindrical pin fins</title><title>International journal of heat and mass transfer</title><description>•Investigation of flow boiling of R245fa refrigerant in a microgap populated with cylindrical circular cylindrical pin fins, for a wide range of mass flux and heat flux.•High speed visualization of flow regimes, including bubbly and foggy.•Comprehensive analysis of single-phase and two-phase average heat transfer coefficient, and comparison with an existing literature.•Ability to run two-phase flow experiments in a 200 μm microgap at pressures as high as 2 MPa.
In this study, flow boiling of refrigerant R245fa is investigated in a microgap of height 200 μm populated with a staggered pin fin array of diameter 150 μm and spacing 200 μm. For heat fluxes up to 498 W/cm2, mass flux values up to 7896 kg/m2 s, and inlet temperatures of 13 °C and 18 °C, average two-phase heat transfer coefficient up to 60 kW/m2 K are measured. High speed flow visualizations at frame rate of 2229 fps elucidate the flow boiling patterns inside the microgaps, including bubbly and foggy that are generated in the pin finned area. Surface temperatures are measured for heat fluxes up to 498 W/cm2 which enable determination of heat transfer characteristics.</description><subject>Flow boiling</subject><subject>Fluid mechanics</subject><subject>Heat exchangers</subject><subject>Heat flux</subject><subject>Heat transfer</subject><subject>Heat transfer coefficients</subject><subject>Microgap</subject><subject>Phase transitions</subject><subject>Pin fins</subject><subject>Two-phase flow</subject><subject>Two-phase heat transfer</subject><issn>0017-9310</issn><issn>1879-2189</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqNkM9LwzAUx4MoOKf_Q8CLl9a8pE3amzKcPxiIoueQpGmX0rUz6Rz7702ZNy-eHo_vj8f7IHQDJAUC_LZNXbu2atyoEEav-lBbn1ICIgWaAogTNINClAmFojxFMxKVpGRAztFFCO20kozP0NuyG_ZYD65zfYOHGr_TLK8Vdj1WeOOMHxq1xXs3rnEYVdNYbytsnDe7TnlsDjFWeWdUh7cxUrs-XKKzWnXBXv3OOfpcPnwsnpLV6-Pz4n6VGCbImCiTa1JVTOdlzcEILrIqB64pLzOoCLGUaV2o2nBquFKiZJkWxJSM8UyDEGyOro-9Wz987WwYZTvsfB9PSkp4TjgUxeS6O7riJyF4W8utdxvlDxKInEDKVv4FKSeQEqiMIGPFy7HCxm--XVSDcbY3tnLemlFWg_t_2Q9WxIgj</recordid><startdate>201806</startdate><enddate>201806</enddate><creator>Asrar, Pouya</creator><creator>Zhang, Xuchen</creator><creator>Green, Craig E.</creator><creator>Bakir, Muhannad</creator><creator>Joshi, Yogendra K.</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TB</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>KR7</scope><scope>L7M</scope></search><sort><creationdate>201806</creationdate><title>Flow boiling of R245fa in a microgap with staggered circular cylindrical pin fins</title><author>Asrar, Pouya ; Zhang, Xuchen ; Green, Craig E. ; Bakir, Muhannad ; Joshi, Yogendra K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c370t-ac5b0dd3b59f61c7674d516b26941d00e23bb8afc62c6aa7934b70c93364b1773</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Flow boiling</topic><topic>Fluid mechanics</topic><topic>Heat exchangers</topic><topic>Heat flux</topic><topic>Heat transfer</topic><topic>Heat transfer coefficients</topic><topic>Microgap</topic><topic>Phase transitions</topic><topic>Pin fins</topic><topic>Two-phase flow</topic><topic>Two-phase heat transfer</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Asrar, Pouya</creatorcontrib><creatorcontrib>Zhang, Xuchen</creatorcontrib><creatorcontrib>Green, Craig E.</creatorcontrib><creatorcontrib>Bakir, Muhannad</creatorcontrib><creatorcontrib>Joshi, Yogendra K.</creatorcontrib><collection>CrossRef</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>International journal of heat and mass transfer</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Asrar, Pouya</au><au>Zhang, Xuchen</au><au>Green, Craig E.</au><au>Bakir, Muhannad</au><au>Joshi, Yogendra K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Flow boiling of R245fa in a microgap with staggered circular cylindrical pin fins</atitle><jtitle>International journal of heat and mass transfer</jtitle><date>2018-06</date><risdate>2018</risdate><volume>121</volume><spage>329</spage><epage>342</epage><pages>329-342</pages><issn>0017-9310</issn><eissn>1879-2189</eissn><abstract>•Investigation of flow boiling of R245fa refrigerant in a microgap populated with cylindrical circular cylindrical pin fins, for a wide range of mass flux and heat flux.•High speed visualization of flow regimes, including bubbly and foggy.•Comprehensive analysis of single-phase and two-phase average heat transfer coefficient, and comparison with an existing literature.•Ability to run two-phase flow experiments in a 200 μm microgap at pressures as high as 2 MPa.
In this study, flow boiling of refrigerant R245fa is investigated in a microgap of height 200 μm populated with a staggered pin fin array of diameter 150 μm and spacing 200 μm. For heat fluxes up to 498 W/cm2, mass flux values up to 7896 kg/m2 s, and inlet temperatures of 13 °C and 18 °C, average two-phase heat transfer coefficient up to 60 kW/m2 K are measured. High speed flow visualizations at frame rate of 2229 fps elucidate the flow boiling patterns inside the microgaps, including bubbly and foggy that are generated in the pin finned area. Surface temperatures are measured for heat fluxes up to 498 W/cm2 which enable determination of heat transfer characteristics.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ijheatmasstransfer.2017.12.117</doi><tpages>14</tpages></addata></record> |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Flow boiling Fluid mechanics Heat exchangers Heat flux Heat transfer Heat transfer coefficients Microgap Phase transitions Pin fins Two-phase flow Two-phase heat transfer |
| title | Flow boiling of R245fa in a microgap with staggered circular cylindrical pin fins |
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