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تحلیل عددی اثر خواص غیرنیوتنی سیالات بر پدیده ضربه قوچ در لوله‌ها | ||
| مکانیک سیالات و آیرودینامیک | ||
| مقاله 4، دوره 12، شماره 2 - شماره پیاپی 32، اسفند 1402، صفحه 43-55 اصل مقاله (914 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسنده | ||
| بنفشه نوروزی* | ||
| استادیار ، مؤسسه آموزش عالی لامعی گرگانی،گرگان، ایران | ||
| تاریخ دریافت: 24 شهریور 1402، تاریخ بازنگری: 15 دی 1402، تاریخ پذیرش: 27 دی 1402 | ||
| چکیده | ||
| در پژوهش حاضر، رفتار یک سیال غیرنیوتنی در شرایط رخداد پدیده ضربه قوچ، به‌صورت عددی مورد بررسی قرار گرفته است. خواص غیرنیوتنی سیال نظیر رابطه غیرخطی تنش و کرنش و نیز دارابودن ثابت زمانی رهایی از تنش و...باعث میگردد که موج فشاری حاصل از قطع ناگهانی جریان، در این حالت، رفتاری متفاوت با یک سیال نیوتنی نظیر آب داشته باشد. سیستم مورد بررسی از نوع شیر، لوله و مخزن و معادلات حاکم بر مسئله نیز معادلات پیوستگی و مومنتوم است. در مدل‌سازی معادلات، از روش عددی تفاضل محدود استفاده شده است. در ادامه، بی‌بُعد سازی معادلات انجام شده و سپس، تاثیر اعداد دبورا و رینولدز بر تاریخچه فشاری در نقاط بحرانی لوله نظیر پشت شیر و وسط لوله بررسی گردیده است. نتایج مدل‌سازی نشان داده است که افزایش عدد دبورا که از شاخصهای سیال غیرنیوتنی است، باعث افزایش ارتفاع نوسانات موج فشاری در طول پدیده ضربه قوچ نسبت به سیال نیوتنی میشود. همچنین مشخص گردیده است که در یک رینولدز ثابت، در جریان آرام، پدیده لاین پکینگ در سیال غیرنیوتنی، نسبت به سیال نیوتنی کمی بیشتر است که دلیل آن به ویژگی ثابت زمان رهایی از تنش ارتباط داده میشود که به‌شدت متمایل به نگهداشت انرژی پتانسیل وارده بوده و در مقابل دمپینگ جریان انتقالی مقاومت میکند و باعث میشود که در مقایسه با سیال نیوتنی، زمان میرایی طولانیتری داشته باشند. | ||
| کلیدواژه‌ها | ||
| ضربه قوچ؛ سیال غیرنیوتنی؛ عدد رینولدز؛ عدد دبورا؛ روش عددی تفاضل محدود؛ لاین پکینگ | ||
| عنوان مقاله [English] | ||
| Numerical analysis of the effect of non-Newtonian properties of fluids on fluid-hammer phenomenon in the pipes | ||
| نویسندگان [English] | ||
| Banafsheh Norouzi | ||
| Assistant Professor, Gorgani Institute of Higher Education, Gorgan, Iran | ||
| چکیده [English] | ||
| In this paper, the behavior of a non-Newtonian polymer through fluid hammer phenomenon in the pipe investigates. Special properties of this fluid such as nonlinear relation between stress and strain, having relaxation time make the pressure wave resulting from this phenomenon to behave differently from a Newtonian fluid. The system under investigation is reservoir-pipe-valve system and the equations representing the conservation of mass and momentum govern the transitional flow in the pipes. In the modeling of the equations finite difference numerical method is used. After defining non-dimensional numbers of governing equations, the effect of Deborah and Reynolds numbers on pressure historic at critical points such as at valve and midpoint investigate. The modeling results show that about investigating sensitivity to the Reynolds number, the pressure wave produced by non-Newtonian polymer shows a sensitivity similar to that of Newtonian fluids. It was also found that an increase in the Deborah number, indicating the elasticity of the polymer, affects the reduction of tensions and increases the oscillation height and consequently attenuation time of the created transient flow to be longer. It has been observed that in similar conditions, the phenomenon of line packing in viscoelastic fluid is slightly higher than in Newtonian fluid. The reason for this is definitely related to the constant characteristic of the relaxation time, which is strongly inclined to maintain the incoming potential energy and resists the damping of the transfer flow, which causes a long damping time compared to the Newtonian fluid have more. | ||
| کلیدواژه‌ها [English] | ||
| azimuth angle, differential pressure sensor, free-end cylinder, underwater vehicle speedometry | ||
| مراجع | ||
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