Strouhal number effects on dynamic boundary layer evolution over a wedge surface from initial flow to steady flow: analytical approach

• Autorzy: Bachiri Mohamed , Bouabdallah Ahcen

Identyfikatory

DOI

10.2478/ijame-2022-0048

• Języki publikacji: EN

Abstrakty

EN

The present work studies the effects of the physical parameter characterizing the laminar flow regime, namely the Strouhal number, on the evolution of the unsteady dynamic boundary-layer developed along a wedge surface. Similarity method is used to transform unsteady momentum equation to dimensionless form. Using superposition method between diffusion and convective flows solutions, an ad hoc velocity profile formula is proposed. The obtained results confirm perfectly the numerical data given by Blasius, Falkner-Skan and Williams-Rhyne for all Strouhal numbers. A new accurate analytical function of the local skin friction is established for all time values and for different wedge surface directions. In order to give further clarification on the flows evolutions from diffusion flow to convective flow, in the whole space domain, new skin friction coefficient curves are plotted for all Strouhal numbers and for different wedge surface directions.

Słowa kluczowe

EN

unsteady boundary layer; wedge surface; Strouhal number; superposition method; diffusion; convective

PL

liczba Strouhala; dyfuzja; konwekcja

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2022
• Tom: Vol. 27, no. 4
• Strony: 26--39
• Opis fizyczny: Bibliogr. 21 poz., tab., wykr.

Twórcy

autor

Bachiri Mohamed

• Matter Sciences Department, Faculty of Sciences -University of Amar Telidji B.P 37 G, Laghouat 03000, ALGERIA

autor

Bouabdallah Ahcen

• Thermodynamics and Energetical Systems Laboratory, Faculty of Physics/USTHB B.P 32 El Alia, 16111 Bab Ezzouar-Algiers, ALGERIA

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)