Pool-Boiling Performance on Thin Metal Foils with Graphene-Oxide-Nanoflake Deposit
The pool-boiling performance of water on thin metal foils with graphene-oxide deposition was studied. The boiling performance was evaluated both on fully coated surfaces, achieved by spin-coating, and surfaces with a laser-textured nucleation site, into which graphene oxide was added via drop-castin...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-08-01
|
| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/12/16/2772 |
| _version_ | 1797408573043507200 |
|---|---|
| author | Tadej Bregar Matevž Vodopivec Tim Pečnik Matevž Zupančič Iztok Golobič |
| author_facet | Tadej Bregar Matevž Vodopivec Tim Pečnik Matevž Zupančič Iztok Golobič |
| author_sort | Tadej Bregar |
| collection | DOAJ |
| description | The pool-boiling performance of water on thin metal foils with graphene-oxide deposition was studied. The boiling performance was evaluated both on fully coated surfaces, achieved by spin-coating, and surfaces with a laser-textured nucleation site, into which graphene oxide was added via drop-casting. During the experiments, a high-speed IR camera was used to obtain the transient temperature and heat-flux distribution. At the same time, a high-speed video camera was used to acquire synchronized bubble-growth recordings. In addition, a surface-wettability analysis was conducted for all the samples. In the case of fully coated samples, graphene-oxide deposition resulted in an increased number of active nucleation sites and an increase in the nucleation temperature, leading to a lowered nucleation frequency. Meanwhile, samples with a single laser-textured nucleation site enabled the analysis of isolated vapor bubbles, confirming that graphene-oxide deposition leads to a higher nucleation temperature, consequently resulting in a larger bubble-departure diameter and longer growth time. Two explanations for the results are proposed: the wettability of graphene-oxide deposition and the filling of surface microcavities with graphene-oxide nanoflakes. |
| first_indexed | 2024-03-09T04:01:26Z |
| format | Article |
| id | doaj.art-60f782abf53f43c29f4d1ffc72e653a6 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T04:01:26Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-60f782abf53f43c29f4d1ffc72e653a62023-12-03T14:12:53ZengMDPI AGNanomaterials2079-49912022-08-011216277210.3390/nano12162772Pool-Boiling Performance on Thin Metal Foils with Graphene-Oxide-Nanoflake DepositTadej Bregar0Matevž Vodopivec1Tim Pečnik2Matevž Zupančič3Iztok Golobič4Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, SloveniaFaculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, SloveniaFaculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, SloveniaFaculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, SloveniaFaculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, SloveniaThe pool-boiling performance of water on thin metal foils with graphene-oxide deposition was studied. The boiling performance was evaluated both on fully coated surfaces, achieved by spin-coating, and surfaces with a laser-textured nucleation site, into which graphene oxide was added via drop-casting. During the experiments, a high-speed IR camera was used to obtain the transient temperature and heat-flux distribution. At the same time, a high-speed video camera was used to acquire synchronized bubble-growth recordings. In addition, a surface-wettability analysis was conducted for all the samples. In the case of fully coated samples, graphene-oxide deposition resulted in an increased number of active nucleation sites and an increase in the nucleation temperature, leading to a lowered nucleation frequency. Meanwhile, samples with a single laser-textured nucleation site enabled the analysis of isolated vapor bubbles, confirming that graphene-oxide deposition leads to a higher nucleation temperature, consequently resulting in a larger bubble-departure diameter and longer growth time. Two explanations for the results are proposed: the wettability of graphene-oxide deposition and the filling of surface microcavities with graphene-oxide nanoflakes.https://www.mdpi.com/2079-4991/12/16/2772graphene oxidenanocoatingnucleate boilinglocal heat fluxnucleation site density |
| spellingShingle | Tadej Bregar Matevž Vodopivec Tim Pečnik Matevž Zupančič Iztok Golobič Pool-Boiling Performance on Thin Metal Foils with Graphene-Oxide-Nanoflake Deposit Nanomaterials graphene oxide nanocoating nucleate boiling local heat flux nucleation site density |
| title | Pool-Boiling Performance on Thin Metal Foils with Graphene-Oxide-Nanoflake Deposit |
| title_full | Pool-Boiling Performance on Thin Metal Foils with Graphene-Oxide-Nanoflake Deposit |
| title_fullStr | Pool-Boiling Performance on Thin Metal Foils with Graphene-Oxide-Nanoflake Deposit |
| title_full_unstemmed | Pool-Boiling Performance on Thin Metal Foils with Graphene-Oxide-Nanoflake Deposit |
| title_short | Pool-Boiling Performance on Thin Metal Foils with Graphene-Oxide-Nanoflake Deposit |
| title_sort | pool boiling performance on thin metal foils with graphene oxide nanoflake deposit |
| topic | graphene oxide nanocoating nucleate boiling local heat flux nucleation site density |
| url | https://www.mdpi.com/2079-4991/12/16/2772 |
| work_keys_str_mv | AT tadejbregar poolboilingperformanceonthinmetalfoilswithgrapheneoxidenanoflakedeposit AT matevzvodopivec poolboilingperformanceonthinmetalfoilswithgrapheneoxidenanoflakedeposit AT timpecnik poolboilingperformanceonthinmetalfoilswithgrapheneoxidenanoflakedeposit AT matevzzupancic poolboilingperformanceonthinmetalfoilswithgrapheneoxidenanoflakedeposit AT iztokgolobic poolboilingperformanceonthinmetalfoilswithgrapheneoxidenanoflakedeposit |