Analytical Model With Nonadiabatic Effects for Pressure Drop and Heat Transfer During Boiling and Condensation Flows in Conventional Channels and Minichannels
| Autor: | Jarosław Mikielewicz, Dariusz Mikielewicz, Rafał Andrzejczyk, Blanka Jakubowska |
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| Rok vydání: | 2016 |
| Předmět: |
Fluid Flow and Transfer Processes
Pressure drop Materials science 020209 energy Mechanical Engineering Thermodynamics 02 engineering and technology Heat transfer coefficient Flow pattern Condensed Matter Physics Physics::Fluid Dynamics 020303 mechanical engineering & transports 0203 mechanical engineering Heat flux Shear (geology) Boiling Heat transfer 0202 electrical engineering electronic engineering information engineering Nucleate boiling |
| Zdroj: | Heat Transfer Engineering. 37:1158-1171 |
| ISSN: | 1521-0537 0145-7632 |
| DOI: | 10.1080/01457632.2015.1112213 |
| Popis: | In this paper a method developed earlier by the authors is applied to calculations of pressure drop and heat transfer coefficient for boiling flow and condensation flow with account of nonadiabatic effects for some recent data collected from the literature. The first effect, the modification of interface shear stresses in an annular flow pattern, is considered through incorporation of the so-called “blowing parameter.” The mechanism of modification of shear stresses at the vapor–liquid interface for such case is presented in detail in the paper. In the case of annular flow it contributes to thickening and thinning of the liquid film, which correspond to condensation and boiling, respectively. There is also another influence of the wall heat flux, where it is influencing the bubble nucleation in the case of the bubbly flow pattern. As a result, a modified general form of the two-phase flow multiplier, applicable both to boiling flow and condensation flow, is obtained, in which the nonadiabatic effects are ... |
| Databáze: | OpenAIRE |
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