Numerical study of circumferential temperature difference reduction at the absorber tube of parabolic trough direct steam generation collector by inserting a twisted tape in superheated region
The present numerical simulation investigates the influence of a twisted tape inserts on circumferential temperature difference reduction and heat transfer enhancement in the absorber tube of parabolic trough collector. The effect of twisted tape geometrical parameters and the Reynolds number on the...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2020-10-01
|
| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X20304627 |
| _version_ | 1818504425537273856 |
|---|---|
| author | S.Mostafa Hosseinalipour Ali Rostami Gholamreza Shahriari |
| author_facet | S.Mostafa Hosseinalipour Ali Rostami Gholamreza Shahriari |
| author_sort | S.Mostafa Hosseinalipour |
| collection | DOAJ |
| description | The present numerical simulation investigates the influence of a twisted tape inserts on circumferential temperature difference reduction and heat transfer enhancement in the absorber tube of parabolic trough collector. The effect of twisted tape geometrical parameters and the Reynolds number on the circumferential temperature difference, Nusselt number, friction factor and thermal performance factor is analyzed. Superheated steam is used as the heat transfer fluid. In present investigation, the Reynolds number is considered in the range of 104 ≤ Re ≤ 9.79×105; clearance ratio and twist ratio are varied in the range of 0–0.5 and 2.5–10, respectively. For the considered range of these parameters, Nusselt number increases 1.0–1.7 times and friction factor increases in the range of 1.8–4.1 times. Therefore, the maximum thermal performance factor under identical pumping power is in the range of 0.85–1.1.Twisted tape with minimum twist ratio and zero clearance provides higher Nusselt number and friction factor due to strong generated swirl flow and increased fluid hydraulic path length. According to the numerical results, the maximum circumferential temperature difference decreases about 10–45% which will significantly reduce thermal stresses in the absorber tube. |
| first_indexed | 2024-12-10T21:36:57Z |
| format | Article |
| id | doaj.art-7fe7f10651624a82ab31dd93cba7cf2e |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-10T21:36:57Z |
| publishDate | 2020-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-7fe7f10651624a82ab31dd93cba7cf2e2022-12-22T01:32:36ZengElsevierCase Studies in Thermal Engineering2214-157X2020-10-0121100720Numerical study of circumferential temperature difference reduction at the absorber tube of parabolic trough direct steam generation collector by inserting a twisted tape in superheated regionS.Mostafa Hosseinalipour0Ali Rostami1Gholamreza Shahriari2Energy, Water and Environment Research Center, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran; Corresponding author.Energy, Water and Environment Research Center, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, IranSchool of Mechanical Engineering, Iran University of Science and Technology, Tehran, IranThe present numerical simulation investigates the influence of a twisted tape inserts on circumferential temperature difference reduction and heat transfer enhancement in the absorber tube of parabolic trough collector. The effect of twisted tape geometrical parameters and the Reynolds number on the circumferential temperature difference, Nusselt number, friction factor and thermal performance factor is analyzed. Superheated steam is used as the heat transfer fluid. In present investigation, the Reynolds number is considered in the range of 104 ≤ Re ≤ 9.79×105; clearance ratio and twist ratio are varied in the range of 0–0.5 and 2.5–10, respectively. For the considered range of these parameters, Nusselt number increases 1.0–1.7 times and friction factor increases in the range of 1.8–4.1 times. Therefore, the maximum thermal performance factor under identical pumping power is in the range of 0.85–1.1.Twisted tape with minimum twist ratio and zero clearance provides higher Nusselt number and friction factor due to strong generated swirl flow and increased fluid hydraulic path length. According to the numerical results, the maximum circumferential temperature difference decreases about 10–45% which will significantly reduce thermal stresses in the absorber tube.http://www.sciencedirect.com/science/article/pii/S2214157X20304627Twisted tapeDirect steam generationParabolic trough collectorsHeat transfer enhancement |
| spellingShingle | S.Mostafa Hosseinalipour Ali Rostami Gholamreza Shahriari Numerical study of circumferential temperature difference reduction at the absorber tube of parabolic trough direct steam generation collector by inserting a twisted tape in superheated region Case Studies in Thermal Engineering Twisted tape Direct steam generation Parabolic trough collectors Heat transfer enhancement |
| title | Numerical study of circumferential temperature difference reduction at the absorber tube of parabolic trough direct steam generation collector by inserting a twisted tape in superheated region |
| title_full | Numerical study of circumferential temperature difference reduction at the absorber tube of parabolic trough direct steam generation collector by inserting a twisted tape in superheated region |
| title_fullStr | Numerical study of circumferential temperature difference reduction at the absorber tube of parabolic trough direct steam generation collector by inserting a twisted tape in superheated region |
| title_full_unstemmed | Numerical study of circumferential temperature difference reduction at the absorber tube of parabolic trough direct steam generation collector by inserting a twisted tape in superheated region |
| title_short | Numerical study of circumferential temperature difference reduction at the absorber tube of parabolic trough direct steam generation collector by inserting a twisted tape in superheated region |
| title_sort | numerical study of circumferential temperature difference reduction at the absorber tube of parabolic trough direct steam generation collector by inserting a twisted tape in superheated region |
| topic | Twisted tape Direct steam generation Parabolic trough collectors Heat transfer enhancement |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X20304627 |
| work_keys_str_mv | AT smostafahosseinalipour numericalstudyofcircumferentialtemperaturedifferencereductionattheabsorbertubeofparabolictroughdirectsteamgenerationcollectorbyinsertingatwistedtapeinsuperheatedregion AT alirostami numericalstudyofcircumferentialtemperaturedifferencereductionattheabsorbertubeofparabolictroughdirectsteamgenerationcollectorbyinsertingatwistedtapeinsuperheatedregion AT gholamrezashahriari numericalstudyofcircumferentialtemperaturedifferencereductionattheabsorbertubeofparabolictroughdirectsteamgenerationcollectorbyinsertingatwistedtapeinsuperheatedregion |