A regressive model for dynamic instabilities during the condensation of R404A and R507 refrigerants
| Autor: | Tadeusz Bohdal, Josua P. Meyer, Aleksander Denis, Waldemar Kuczyński |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Mechanical Engineering Regression function Condensation 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Instability Experimental research 010305 fluids & plasmas Refrigerant Phase change 0103 physical sciences 0210 nano-technology |
| Zdroj: | International Journal of Heat and Mass Transfer. 141:1025-1035 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2019.06.095 |
| Popis: | This paper presents the results of experimental research and mathematical modelling on the influence of dynamic instabilities on the condensation phase change of R507 refrigerant in tubular mini-channels. This agent is currently being utilised as a temporary substitute for R404A, with R448A intended as the target substitute. In addition to the results, this paper contains a dimensional analysis procedure based on the Π-Buckingham theorem that has allowed for the development of a regressive model for the velocities of the dynamic instabilities. The experimental part of this paper was conducted using tubular mini-channels with internal diameters of 1.44, 2.3, and 3.3 mm. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect