Sontheimer, Henrik ; Stephan, Peter ; Gambaryan-Roisman, Tatiana (2023)
Numerical simulation of a drop train impacting a superheated wall.
17th International Heat Transfer Conference. Cape Town, South Africa (14.08.2023-18.08.2023)
doi: 10.1615/ihtc17.410-20
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
Spray cooling is a promising technology for cooling of electronic devices. Understanding hydrodynamics and heat transport during the impact of single and multiple drops contributes to a better understanding of the complex spray impact. We study numerically the impact of drop trains onto a dry, superheated wall in the drop deposition regime within a pure vapour atmosphere at temperatures below the onset of nucleate boiling. We use an incompressible solver within the OpenFOAM library using the volume of fluid method and taking evaporation into account. Evaporation at the three-phase contact line is considered in a subgrid model. Starting with a reference drop train impacting during the sessile drop phase of the initial drop, our study shows that with each successive drop impact, spreading and receding phases are prolonged and the maximum contact line radius increases. After the impact of 10 drops, the drop height (liquid film thickness) asymptotically reaches the so called puddle thickness. The decrease in wall surface temperature after each drop impact is similar for all drop impacts following the initial drop impacting the dry wall. Next, the influence of the drop frequency (by keeping a constant kinetic energy and flow rate in the drop train) on hydrodynamics and heat transfer is studied. Hereby the high frequency of drops corresponds to smaller drops and lower impact frequency corresponds to larger drops. It is shown that the final drop shape only depends on the total impacted liquid volume. Furthermore, our study shows that drop trains with large drops and low drop frequency transfer more heat than drop trains with small drops and high drop frequency due to the significant difference in Reynolds and Weber numbers.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Sontheimer, Henrik ; Stephan, Peter ; Gambaryan-Roisman, Tatiana |
| Art des Eintrags: | Bibliographie |
| Titel: | Numerical simulation of a drop train impacting a superheated wall |
| Sprache: | Englisch |
| Publikationsjahr: | 2023 |
| Ort: | Cape Town, South Africa |
| Kollation: | 10 Seiten |
| Veranstaltungstitel: | 17th International Heat Transfer Conference |
| Veranstaltungsort: | Cape Town, South Africa |
| Veranstaltungsdatum: | 14.08.2023-18.08.2023 |
| DOI: | 10.1615/ihtc17.410-20 |
| Kurzbeschreibung (Abstract): | Spray cooling is a promising technology for cooling of electronic devices. Understanding hydrodynamics and heat transport during the impact of single and multiple drops contributes to a better understanding of the complex spray impact. We study numerically the impact of drop trains onto a dry, superheated wall in the drop deposition regime within a pure vapour atmosphere at temperatures below the onset of nucleate boiling. We use an incompressible solver within the OpenFOAM library using the volume of fluid method and taking evaporation into account. Evaporation at the three-phase contact line is considered in a subgrid model. Starting with a reference drop train impacting during the sessile drop phase of the initial drop, our study shows that with each successive drop impact, spreading and receding phases are prolonged and the maximum contact line radius increases. After the impact of 10 drops, the drop height (liquid film thickness) asymptotically reaches the so called puddle thickness. The decrease in wall surface temperature after each drop impact is similar for all drop impacts following the initial drop impacting the dry wall. Next, the influence of the drop frequency (by keeping a constant kinetic energy and flow rate in the drop train) on hydrodynamics and heat transfer is studied. Hereby the high frequency of drops corresponds to smaller drops and lower impact frequency corresponds to larger drops. It is shown that the final drop shape only depends on the total impacted liquid volume. Furthermore, our study shows that drop trains with large drops and low drop frequency transfer more heat than drop trains with small drops and high drop frequency due to the significant difference in Reynolds and Weber numbers. |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet für Technische Thermodynamik (TTD) DFG-Sonderforschungsbereiche (inkl. Transregio) DFG-Sonderforschungsbereiche (inkl. Transregio) > Transregios DFG-Sonderforschungsbereiche (inkl. Transregio) > Transregios > TRR 75 Tropfendynamische Prozesse unter extremen Umgebungsbedingungen Zentrale Einrichtungen Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) > Hochleistungsrechner |
| Hinterlegungsdatum: | 27 Nov 2023 09:41 |
| Letzte Änderung: | 05 Dez 2023 07:43 |
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