On Calculating Heat Transfer and Pressure Drop of Supercritical-Pressure Coolants
| Autor: | Yuri Albertovich Zeigarnik, Irina V. Maslakova, Vladimir A. Kurganov |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Dynamic scraped surface heat exchanger
Radiation Materials science Convective heat transfer Critical heat flux 020209 energy Plate heat exchanger 02 engineering and technology Mechanics Heat transfer coefficient 01 natural sciences 010305 fluids & plasmas Nuclear Energy and Engineering 0103 physical sciences Heat spreader Heat transfer 0202 electrical engineering electronic engineering information engineering Plate fin heat exchanger |
| Zdroj: | Journal of Nuclear Engineering and Radiation Science. 2 |
| ISSN: | 2332-8975 2332-8983 |
| DOI: | 10.1115/1.4032440 |
| Popis: | Specific features of thermophysical properties of single-phase supercritical-pressure (SCP) coolants and typical ranges of their thermodynamic state that determine heat-transfer regularities are presented. A brief analysis of the existing concepts on SCP-coolants heat transfer under turbulent flow in tube is given. Typical features of normal and deteriorated heat-transfer regimes are described. The simple classification of deteriorated heat-transfer regimes at high heat loads that make it possible to distinguish the causes and appraise a degree of heat-transfer deterioration danger is proposed. The results from the studies of the hydraulic-resistance structure under the regimes of normal and deteriorated heat transfer are considered and the conditions, when a one-dimensional (1-D) (homogeneous) flow model can be used in hydraulic calculations, are revealed. Using sounding measurements data, the interrelation between heat-transfer deterioration and radical changes in the averaged turbulent flow structure due to fluid thermal acceleration and Archimedes forces effects is analyzed. The recommendations on calculating normal heat transfer with an account of refined standards on thermophysical properties of water and carbon dioxide are presented. The review and analysis of the existing criteria for forecasting heat-transfer deterioration and assessing the boundaries of the normal heat-transfer range are given, and the correlations for describing deteriorated heat transfer are presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|