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Modeling of Turbulent Heat-Transfer Augmentation in Gas-Droplet Non-Boiling Flow in Diverging and Converging Axisymmetric Ducts with Sudden Expansion
| Content Provider | MDPI |
|---|---|
| Author | Pakhomov, Maksim A. Terekhov, Viktor I. |
| Copyright Year | 2022 |
| Description | The effect of positive (adverse) and negative (favorable) longitudinal pressure gradients on the structure and heat transfer of gas-droplet (air and water) flow in axisymmetric duct with sudden expansion are examined. The superimposed pressure gradient has a large influence on the flow structure and heat transfer in a two-phase mist flow in both a confuser and a diffuser. A narrowing of the confuser angle leads to significant suppression of flow turbulence (more than four times that of the gas-drop flow after sudden pipe expansion without a pressure gradient at φ = 0°). Recirculation zone length decreases significantly compared to the gas-droplet flow without a longitudinal pressure gradient (by up to 30%), and the locus of the heat-transfer maximum shifts slightly downstream, and roughly aligns with the reattachment point of the two-phase flow. Growth of the diffuser opening angle leads to additional production of kinetic energy of gas flow turbulence (almost twice as much as gas-droplet flow after a sudden pipe expansion at φ = 0°). The length of the flow recirculating region in the diffuser increases significantly compared to the separated gas-droplet flow without a pressure gradient (φ = 0°), and the location of maximum heat transfer shifts downstream in the diffuser. |
| Starting Page | 5861 |
| e-ISSN | 19961073 |
| DOI | 10.3390/en15165861 |
| Journal | Energies |
| Issue Number | 16 |
| Volume Number | 15 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-08-12 |
| Access Restriction | Open |
| Subject Keyword | Energies Heat Transfer Droplets Evaporation Turbulence Droplet-laden Flow Confuser Diffuser Pipe Sudden Expansion Rans |
| Content Type | Text |
| Resource Type | Article |
