Experimental investigation of heat transfer characteristics of steam generator with circular-ring turbulators
Heat transfer has been improved by creating turbulence in the fluid flow of heat exchangers through introducing various techniques. The present study investigated the heat transfer characteristics of steam generator with circular-ring tabulators with an inclination angle of 45° and a blocked ratio (...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-01-01
|
| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X22007869 |
| _version_ | 1797956221677862912 |
|---|---|
| author | Bancha Lamlerd Bopit Bubphachot Teerapat Chompookham |
| author_facet | Bancha Lamlerd Bopit Bubphachot Teerapat Chompookham |
| author_sort | Bancha Lamlerd |
| collection | DOAJ |
| description | Heat transfer has been improved by creating turbulence in the fluid flow of heat exchangers through introducing various techniques. The present study investigated the heat transfer characteristics of steam generator with circular-ring tabulators with an inclination angle of 45° and a blocked ratio (BR) of 0.20 mm. The length ratios (LR) of 25%, 50%, 75% and 100%, pitch ratios (PR) of 1.0, 2.0, 3.0 and 4.0 and water flow rates of 12, 24 and 36 l/h were studied. The heat source used waste lubricating oil as fuel to produce steam. The results showed that the heat exchanger with circular-ring inserts provided a higher steam rate than that of a smooth tube by 6.88–10.35%, vapor quality (x) by 0.21–0.92, heat transfer by 1.27–1.55 times and the thermal efficiency by 0.46–0.68 depending on the PR, LR and FR. The optimum insert ratio was LR = 50% while 75% and 100% were not significantly different. The circular-ring inserts changed the flow behavior to turbulent flow. This increased the surface area, causing boundary layer interruptions leading to more heat exchange on the tube surface. |
| first_indexed | 2024-04-10T23:45:32Z |
| format | Article |
| id | doaj.art-1d1c68732ce2413fa4400c437a1da744 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-04-10T23:45:32Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-1d1c68732ce2413fa4400c437a1da7442023-01-11T04:28:55ZengElsevierCase Studies in Thermal Engineering2214-157X2023-01-0141102549Experimental investigation of heat transfer characteristics of steam generator with circular-ring turbulatorsBancha Lamlerd0Bopit Bubphachot1Teerapat Chompookham2Heat Pipe and Thermal Tools Design Research Unit (HTDR), Department of Mechanical Engineering, Faculty of Engineering, Mahasarakham University, Khamriang, Kantarawichai, Maha Sarakham, 44150, ThailandCorresponding author.; Heat Pipe and Thermal Tools Design Research Unit (HTDR), Department of Mechanical Engineering, Faculty of Engineering, Mahasarakham University, Khamriang, Kantarawichai, Maha Sarakham, 44150, ThailandHeat Pipe and Thermal Tools Design Research Unit (HTDR), Department of Mechanical Engineering, Faculty of Engineering, Mahasarakham University, Khamriang, Kantarawichai, Maha Sarakham, 44150, ThailandHeat transfer has been improved by creating turbulence in the fluid flow of heat exchangers through introducing various techniques. The present study investigated the heat transfer characteristics of steam generator with circular-ring tabulators with an inclination angle of 45° and a blocked ratio (BR) of 0.20 mm. The length ratios (LR) of 25%, 50%, 75% and 100%, pitch ratios (PR) of 1.0, 2.0, 3.0 and 4.0 and water flow rates of 12, 24 and 36 l/h were studied. The heat source used waste lubricating oil as fuel to produce steam. The results showed that the heat exchanger with circular-ring inserts provided a higher steam rate than that of a smooth tube by 6.88–10.35%, vapor quality (x) by 0.21–0.92, heat transfer by 1.27–1.55 times and the thermal efficiency by 0.46–0.68 depending on the PR, LR and FR. The optimum insert ratio was LR = 50% while 75% and 100% were not significantly different. The circular-ring inserts changed the flow behavior to turbulent flow. This increased the surface area, causing boundary layer interruptions leading to more heat exchange on the tube surface.http://www.sciencedirect.com/science/article/pii/S2214157X22007869Heat exchangerSteam rateVapor qualityCircular-ring turbulatorAngled baffle |
| spellingShingle | Bancha Lamlerd Bopit Bubphachot Teerapat Chompookham Experimental investigation of heat transfer characteristics of steam generator with circular-ring turbulators Case Studies in Thermal Engineering Heat exchanger Steam rate Vapor quality Circular-ring turbulator Angled baffle |
| title | Experimental investigation of heat transfer characteristics of steam generator with circular-ring turbulators |
| title_full | Experimental investigation of heat transfer characteristics of steam generator with circular-ring turbulators |
| title_fullStr | Experimental investigation of heat transfer characteristics of steam generator with circular-ring turbulators |
| title_full_unstemmed | Experimental investigation of heat transfer characteristics of steam generator with circular-ring turbulators |
| title_short | Experimental investigation of heat transfer characteristics of steam generator with circular-ring turbulators |
| title_sort | experimental investigation of heat transfer characteristics of steam generator with circular ring turbulators |
| topic | Heat exchanger Steam rate Vapor quality Circular-ring turbulator Angled baffle |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X22007869 |
| work_keys_str_mv | AT banchalamlerd experimentalinvestigationofheattransfercharacteristicsofsteamgeneratorwithcircularringturbulators AT bopitbubphachot experimentalinvestigationofheattransfercharacteristicsofsteamgeneratorwithcircularringturbulators AT teerapatchompookham experimentalinvestigationofheattransfercharacteristicsofsteamgeneratorwithcircularringturbulators |