تأثیر شکل منبع تخلیه بر مشخصات جریان در تخلیۀ سطحی پساب‌های با شناوری منفی

نوع مقاله : پژوهشی

نویسندگان

• فاطمه شاچری ¹
• ندا شیخ رضازاده نیکو ²
• محسن سعیدی ³
• جمال محمدولی سامانی ⁴
• احمد شاچری ⁵

¹ دانشگاه تربیت مدرس

² دانشگاه فردوسی مشهد

³ علم و صنعت ایران

⁴ تربیت مدرس

⁵ سمنان

10.22067/civil.v30i2.50421

چکیده

در این مقاله نتایج آزمایشگاهی تأثیر شکل منبع تخلیه‌کننده بر تخلیۀ سطحی پساب‌های با شناوری منفی در محیطی ساکن و همگن برای دو مقطع مستطیل و ذوزنقه (مقطع هیدرولیکی بهینه) ارائه شده است. آزمایش‌ها در اتاق تاریک ثبت و با تحلیل رقومی پردازش شده است. رفتار جریان چگال برای عدد فرود دنسیمتریک کمتر از بیست گزارش شده است. بنابراین، خاصیت خود-همسانی جریان در این آزمایش‌ها برقرار نیست. پارامترهای مورد بررسی شامل الگوی جریان، پروفیل غلظت، تغییر عرض و مسیر حرکت جریان می‌باشند. نتایج بررسی رفتار جریان در مقاطع نشان می‌دهد علی‌رغم الگوی رفتاری مشابه، مقطع ذوزنقه از مشخصات هندسی و اختلاطی بهتری نسبت به مقطع مستطیل برخوردار است.

کلیدواژه‌ها

• تخلیۀ سطحی
• جریان چگال
• شکل مقطع منبع تخلیه‌کننده
• مشخصات جریان

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عنوان مقاله [English]

Effects of Discharges Source Section on Flow Characteristics of Negatively Buoyant Effluent

نویسندگان [English]

• Fatemeh Shacheri ¹
• Neda Sheykh rezazadeh nikou ²
• Mohsen Saeedi ³
• Jamal Mohammad Vali Samani ⁴
• Ahmad Shacheri ⁵

¹ Tarbiat Modares University

² Ferdosi Mashhad

³ Science and Technology of Iran

⁴ Prof. of Water Structure Engineering, of Tarbiat Modares University (TMU).

⁵ Semnan

چکیده [English]

Results of a comprehensive experimental study on the impact of the outfall source shape on flow characteristics in surface discharge of negatively buoyant effluent in stagnant water were done on two sections of rectangular and trapezoidal (The optimal hydraulic cross section). These experiments were recorded in dark room and processed using digital analysis. Dense flow behavior was reported for Densimetric Froude number less than twenty so, the self-similarity property of flow is not established in these experiments. The parameters examined in this research include flow pattern, concentration profiles, change width and flow trajectory. The result of flow behavior in these sections indicates that despite similar behavioral pattern, geometric and mixing characteristics of trapezoid are better than rectangular.

کلیدواژه‌ها [English]

• Dense flow
• Discharges Source Cross Section
• Flow properties
• Surface Discharge

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