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

مهندسی عمران فردوسی

مقاله 4، دوره 30، شماره 2 - شماره پیاپی 18، اردیبهشت 1396، صفحه 45-60   

نوع مقاله: پژوهشی

شناسه دیجیتال (DOI): 10.22067/civil.v30i2.50421

نویسندگان

فاطمه شاچری^{* 1}؛ ندا شیخ رضازاده نیکو²؛ محسن سعیدی³؛ جمال محمدولی سامانی⁴؛ احمد شاچری⁵

¹دانشگاه تربیت مدرس

²دانشگاه فردوسی مشهد

³علم و صنعت ایران

⁴تربیت مدرس

⁵سمنان

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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