Study of Pressure Drops and Heat Transfer of Nonequilibrial Two-Phase Flows
| Autor: | Aleksander N. Varava, Ruina Xu, Aleksandr V. Belyaev, Ilya I. Krapivin, Alexey V. Dedov, Pei-Xue Jiang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Pressure drop
Freon Materials science flow boiling Water supply for domestic and industrial purposes Geography Planning and Development Flow (psychology) high reduced pressure Fraction (chemistry) Mechanics Hydraulic engineering Aquatic Science Biochemistry Volumetric flow rate Phase (matter) Heat transfer heat transfer hydrodynamics Range (statistics) TC1-978 TD201-500 Water Science and Technology |
| Zdroj: | Water, Vol 13, Iss 2275, p 2275 (2021) Water Volume 13 Issue 16 |
| ISSN: | 2073-4441 |
| Popis: | Currently, there are no universal methods for calculating the heat transfer and pressure drop for a wide range of two-phase flow parameters in mini-channels due to changes in the void fraction and flow regime. Many experimental studies have been carried out, and narrow-range calculation methods have been developed. With increasing pressure, it becomes possible to expand the range of parameters for applying reliable calculation methods as a result of changes in the flow regime. This paper provides an overview of methods for calculating the pressure drops and heat transfer of two-phase flows in small-diameter channels and presents a comparison of calculation methods. For conditions of high reduced pressures pr = p/pcr ≈ 0.4 ÷ 0.6, the results of own experimental studies of pressure drops and flow boiling heat transfer of freons in the region of low and high mass flow rates (G = 200–2000 kg/m2 s) are presented. A description of the experimental stand is given, and a comparison of own experimental data with those obtained using the most reliable calculated relations is carried out. |
| Databáze: | OpenAIRE |
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