Deyn, Lars H. von ; Schmidt, Marius ; Örlü, Ramis ; Stroh, Alexander ; Kriegseis, Jochen ; Böhm, Benjamin ; Frohnapfel, Bettina (2024)
Ridge-type roughness: from turbulent channel flow to internal combustion engine.
In: Experiments in Fluids, 2022, 63 (1)
doi: 10.26083/tuprints-00023460
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
While existing engineering tools enable us to predict how homogeneous surface roughness alters drag and heat transfer of near-wall turbulent flows to a certain extent, these tools cannot be reliably applied for heterogeneous rough surfaces. Nevertheless, heterogeneous roughness is a key feature of many applications. In the present work we focus on spanwise heterogeneous roughness, which is known to introduce large-scale secondary motions that can strongly alter the near-wall turbulent flow. While these secondary motions are mostly investigated in canonical turbulent shear flows, we show that ridge-type roughness — one of the two widely investigated types of spanwise heterogeneous roughness — also induces secondary motions in the turbulent flow inside a combustion engine. This indicates that large scale secondary motions can also be found in technical flows, which neither represent classical turbulent equilibrium boundary layers nor are in a statistically steady state. In addition, as the first step towards improved drag predictions for heterogeneous rough surfaces, the Reynolds number dependency of the friction factor for ridge-type roughness is presented.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Deyn, Lars H. von ; Schmidt, Marius ; Örlü, Ramis ; Stroh, Alexander ; Kriegseis, Jochen ; Böhm, Benjamin ; Frohnapfel, Bettina |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Ridge-type roughness: from turbulent channel flow to internal combustion engine |
| Sprache: | Englisch |
| Publikationsjahr: | 19 März 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | Januar 2022 |
| Ort der Erstveröffentlichung: | Berlin ; Heidelberg |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Experiments in Fluids |
| Jahrgang/Volume einer Zeitschrift: | 63 |
| (Heft-)Nummer: | 1 |
| Kollation: | 16 Seiten |
| DOI: | 10.26083/tuprints-00023460 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/23460 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | While existing engineering tools enable us to predict how homogeneous surface roughness alters drag and heat transfer of near-wall turbulent flows to a certain extent, these tools cannot be reliably applied for heterogeneous rough surfaces. Nevertheless, heterogeneous roughness is a key feature of many applications. In the present work we focus on spanwise heterogeneous roughness, which is known to introduce large-scale secondary motions that can strongly alter the near-wall turbulent flow. While these secondary motions are mostly investigated in canonical turbulent shear flows, we show that ridge-type roughness — one of the two widely investigated types of spanwise heterogeneous roughness — also induces secondary motions in the turbulent flow inside a combustion engine. This indicates that large scale secondary motions can also be found in technical flows, which neither represent classical turbulent equilibrium boundary layers nor are in a statistically steady state. In addition, as the first step towards improved drag predictions for heterogeneous rough surfaces, the Reynolds number dependency of the friction factor for ridge-type roughness is presented. |
| Freie Schlagworte: | Engineering Fluid Dynamics, Fluid- and Aerodynamics, Engineering Thermodynamics, Heat and Mass Transfer |
| ID-Nummer: | Artikel-ID: 18 |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-234608 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet Reaktive Strömungen und Messtechnik (RSM) |
| Hinterlegungsdatum: | 19 Mär 2024 13:54 |
| Letzte Änderung: | 20 Mär 2024 09:32 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Ridge-type roughness: from turbulent channel flow to internal combustion engine. (deposited 19 Mär 2024 13:54) [Gegenwärtig angezeigt]
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