Effect of gamma irradiation on the critical heat flux of nano-coated surfaces
An anodic electrophoretic deposition (EPD) technique is used to create a uniform TiO2 thin film coating on boiling thin steel plates (1.1 mm by 90 mm). All of the effective parameters except time of the EPD method are kept constant. To investigate the effect of gamma irradiation on the critical heat...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2020-10-01
|
| Series: | Nuclear Engineering and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573318308611 |
| _version_ | 1818189105828200448 |
|---|---|
| author | A. Rahimian H. Kazeminejad H. Khalafi A. Akhavan M. Mirvakili |
| author_facet | A. Rahimian H. Kazeminejad H. Khalafi A. Akhavan M. Mirvakili |
| author_sort | A. Rahimian |
| collection | DOAJ |
| description | An anodic electrophoretic deposition (EPD) technique is used to create a uniform TiO2 thin film coating on boiling thin steel plates (1.1 mm by 90 mm). All of the effective parameters except time of the EPD method are kept constant. To investigate the effect of gamma irradiation on the critical heat flux (CHF), the test specimens were irradiated in a gamma cell to different doses ranging from 100 to 300 kGy, and then SEM and BET analysis were performed. For each coated specimen, the contact angle and capillary length were measured. The specimens were then tested in a boiling pool for CHF and boiling heat transfer coefficient. It was observed that irradiation significantly decreases the maximum pore diameter while it increases the porosity, pore surface area and pore volume. These surface modifications due to gamma irradiation increased the CHF of the nano-coated surfaces compared to that of the unirradiated surfaces. The heat transfer coefficient (HTC) of the nano-coated surfaces irradiated at 300 kGy increased from 83 to 160 kW/(m2 K) at 885 kW/m2 wall heat flux by 100%. The CHF of the irradiated (300 kGy) and unirradiated surfaces are 2035 kW/m2 and 1583 kW/m2, respectively, an increase of nearly 31%. |
| first_indexed | 2024-12-11T23:37:32Z |
| format | Article |
| id | doaj.art-1dbd63ab2a9e420b9307120b146cd9e0 |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-12-11T23:37:32Z |
| publishDate | 2020-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-1dbd63ab2a9e420b9307120b146cd9e02022-12-22T00:45:49ZengElsevierNuclear Engineering and Technology1738-57332020-10-01521023532360Effect of gamma irradiation on the critical heat flux of nano-coated surfacesA. Rahimian0H. Kazeminejad1H. Khalafi2A. Akhavan3M. Mirvakili4Nuclear Science and Technology Research Institute (NSTRI), P.O. Box 11365-3486, Tehran, I.R., IranCorresponding author.; Nuclear Science and Technology Research Institute (NSTRI), P.O. Box 11365-3486, Tehran, I.R., IranNuclear Science and Technology Research Institute (NSTRI), P.O. Box 11365-3486, Tehran, I.R., IranNuclear Science and Technology Research Institute (NSTRI), P.O. Box 11365-3486, Tehran, I.R., IranNuclear Science and Technology Research Institute (NSTRI), P.O. Box 11365-3486, Tehran, I.R., IranAn anodic electrophoretic deposition (EPD) technique is used to create a uniform TiO2 thin film coating on boiling thin steel plates (1.1 mm by 90 mm). All of the effective parameters except time of the EPD method are kept constant. To investigate the effect of gamma irradiation on the critical heat flux (CHF), the test specimens were irradiated in a gamma cell to different doses ranging from 100 to 300 kGy, and then SEM and BET analysis were performed. For each coated specimen, the contact angle and capillary length were measured. The specimens were then tested in a boiling pool for CHF and boiling heat transfer coefficient. It was observed that irradiation significantly decreases the maximum pore diameter while it increases the porosity, pore surface area and pore volume. These surface modifications due to gamma irradiation increased the CHF of the nano-coated surfaces compared to that of the unirradiated surfaces. The heat transfer coefficient (HTC) of the nano-coated surfaces irradiated at 300 kGy increased from 83 to 160 kW/(m2 K) at 885 kW/m2 wall heat flux by 100%. The CHF of the irradiated (300 kGy) and unirradiated surfaces are 2035 kW/m2 and 1583 kW/m2, respectively, an increase of nearly 31%.http://www.sciencedirect.com/science/article/pii/S1738573318308611Electrophoretic deposition (EPD)Nano-coatingCritical heat fluxGamma irradiation |
| spellingShingle | A. Rahimian H. Kazeminejad H. Khalafi A. Akhavan M. Mirvakili Effect of gamma irradiation on the critical heat flux of nano-coated surfaces Nuclear Engineering and Technology Electrophoretic deposition (EPD) Nano-coating Critical heat flux Gamma irradiation |
| title | Effect of gamma irradiation on the critical heat flux of nano-coated surfaces |
| title_full | Effect of gamma irradiation on the critical heat flux of nano-coated surfaces |
| title_fullStr | Effect of gamma irradiation on the critical heat flux of nano-coated surfaces |
| title_full_unstemmed | Effect of gamma irradiation on the critical heat flux of nano-coated surfaces |
| title_short | Effect of gamma irradiation on the critical heat flux of nano-coated surfaces |
| title_sort | effect of gamma irradiation on the critical heat flux of nano coated surfaces |
| topic | Electrophoretic deposition (EPD) Nano-coating Critical heat flux Gamma irradiation |
| url | http://www.sciencedirect.com/science/article/pii/S1738573318308611 |
| work_keys_str_mv | AT arahimian effectofgammairradiationonthecriticalheatfluxofnanocoatedsurfaces AT hkazeminejad effectofgammairradiationonthecriticalheatfluxofnanocoatedsurfaces AT hkhalafi effectofgammairradiationonthecriticalheatfluxofnanocoatedsurfaces AT aakhavan effectofgammairradiationonthecriticalheatfluxofnanocoatedsurfaces AT mmirvakili effectofgammairradiationonthecriticalheatfluxofnanocoatedsurfaces |