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Physical Overview of the Instability in Laminar Wall-Bounded Flows of Newtonian Fluids at Subcritical Reynolds Numbers | ||
Journal of Heat and Mass Transfer Research | ||
دوره 11، شماره 1 - شماره پیاپی 21، مرداد 2024، صفحه 15-32 اصل مقاله (753.07 K) | ||
نوع مقاله: Review Article | ||
شناسه دیجیتال (DOI): 10.22075/jhmtr.2024.31381.1466 | ||
نویسندگان | ||
Hamed Mirzaee* 1؛ Goodarz Ahmadi2؛ Roohollah Rafee1؛ Farhad Talebi1 | ||
1Faculty of Mechanical Engineering, Semnan University, Semnan, Iran | ||
2Department of Mechanical and Aerospace Engineering, Clarkson University, Potsdam, NY, USA | ||
تاریخ دریافت: 07 مرداد 1402، تاریخ بازنگری: 07 بهمن 1402، تاریخ پذیرش: 08 بهمن 1402 | ||
چکیده | ||
This paper reviews the latest findings on instability and subcritical transition to turbulence in wall-bounded flows (i.e., pipe Poiseuille flow, plane channel flow, and plane Couette flow). The main focus was on the early stage of transitional flow and the appearance of coherent structures. The scaling of threshold disturbance amplitude for the onset of natural transition was discussed. Generally, the scaling proved to be in the form of Ac = O(Reg) for Newtonian fluids where Re is the Reynolds number, g ≤ -1, and Ac is the critical perturbation amplitude. It was noted that exploration of perturbations like vortices, streaks, and traveling waves together with their amplitudes could clarify the instability and transition process. Hence, this paper focused on physical behavior and realizations of the transitional flow. Finally, a summary of consequential implications and some open issues for future works were presented and discussed. | ||
کلیدواژهها | ||
Flow؛ Instability؛ Transition؛ Perturbation؛ Amplitude | ||
عنوان مقاله [English] | ||
مرور فیزیکی ناپایداری در جریان های آرام محدود به دیوار سیالات نیوتنی در اعداد رینولدز زیر بحرانی | ||
چکیده [English] | ||
این مقاله آخرین یافته ها درباره ناپایداری و انتقال به آشفتگی زیر بحرانی در جریان های محدود به دیوار (جریان پوازی لوله، جریان کانال صفحه ای و جریان کوئت صفحه ای) را مرور می کند. تمرکز اصلی بر مرحله ابتدایی جریان انتقالی و پدیدار شدن ساختارهای منظم بود. مرتبه سنجی دامنه اغتشاشات بحرانی برای شروع انتقال طبیعی مورد بحث قرار گرفت. بطور کلی، مرتبه سنجی بصورت Ac=O(Re) نشان داده می شود که Re عدد رینولدز، ≤-1 و Ac دامنه اغتشاش بحرانی می باشند. علاوه براین، انتقال در مجراهای با دیوار نرم با انتقال با دیوارهای صلب مقایسه گردید. اشاره شد که بررسی اغتشاشاتی مانند گردابه ها، رگه ها و امواج در حال حرکت همراه با دامنه هایشان می تواند ناپایداری و فرایند انتقال را روشن نماید. به همین دلیل، این مقاله بر رفتار فیزیکی و مشاهدات جریان انتقالی متمرکز گردید. در انتها، خلاصه ای از نتایج مهم و برخی مسائل باز برای کارهای آینده ارائه و بحث شدند. | ||
کلیدواژهها [English] | ||
جریان, ناپایداری, انتقال, اغتشاش, دامنه | ||
مراجع | ||
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