مطالعه تجربی عملکرد یک سیستم نمک زدایی تقطیر غشایی با فاصله هوایی در عدد رینولدز بسیار پایین

مقالات آماده انتشار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی مکانیک ، واحد نجف آباد ، دانشگاه آزاد اسلامی ، نجف آباد ، ایران

2 کارشناسی ارشد،گروه مهندسی مکانیک ، واحد نجف آباد ، دانشگاه آزاد اسلامی ، نجف آباد ، ایران

3 دانشیار، گروه مهندسی مکانیک ، واحد نجف آباد ، دانشگاه آزاد اسلامی ، نجف آباد ، ایران

چکیده

تقطیر غشایی (MD) یکی از روش‌های نوین برای نمک‌زدایی آب‌های شور و فوق‌شور است که از اختلاف فشار بخار در دو سمت غشای آب‌گریز برای جداسازی استفاده می‌کند. در میان پیکره بندی‌های مختلف، تقطیر غشایی با فاصله هوایی (AGMD) به دلیل کاهش اتلاف حرارتی و ساختار ساده‌تر، توجه بیشتری به خود جلب کرده است. در این پژوهش، یک نمونه آزمایشگاهی AGMD طراحی و ساخته شده و عملکرد آن در شرایط عملیاتی با عدد رینولدز بسیار پایین مورد بررسی قرار گرفته است؛ آزمایش‌ها با سه پارامتر کلیدی شامل دمای آب تغذیه، شوری آب و ضخامت فاصله هوایی در سطوح مختلف انجام شده‌اند. نتایج نشان می‌دهند که افزایش دمای آب تغذیه منجر به افزایش دبی آب شیرین تولیدی می‌شود، در حالی‌که افزایش شوری و ضخامت فاصله هوایی تأثیر منفی بر روی دبی آب شیرین تولیدی دارند. اما این کاهش در دبی آب تولیدی بسیار محدود بوده و حتی در شوری‌های بسیار بالا (دو برابر شوری آب دریا) نیز افت عملکرد کمتر از ۲۰٪ مشاهده می شود. همچنین مشاهده شد کاهش کارایی سسیستم در شوری های بالا و در فواصل هوایی بالاتر، کمتر است. از سوی دیگر، اگر چه افزایش صخامت فاصله هوایی موجب کاهش عملکرد سیستم نمک زدایی AGMD می شود اما این کاهش با افزایش ضخامت فاصله هوایی کمتر می شود.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental Investigation of an Air Gap Membrane Distillation Desalination System Performance at very Low Reynolds Number

نویسندگان [English]

  • Mehdi Jamali Ghahderijani 1
  • Ali Meshkinfar 2
  • Arash Karimipour 3
1 Assistant Professor,Department of Mechanical Engineering, Na.C.,Islamic Azad University, Najafabad, Iran
2 Master's degree,Department of Mechanical Engineering, Na.C.,Islamic Azad University, Najafabad, Iran
3 Associate Professor,Department of Mechanical Engineering, Na.C.,Islamic Azad University, Najafabad, Iran
چکیده [English]

Membrane Distillation (MD) is an emerging method for desalinating saline and hypersaline waters, which utilizes the vapor pressure difference across a hydrophobic membrane for separation. Among various configurations, Air Gap Membrane Distillation (AGMD) has gained increased attention due to its reduced heat loss and simpler structure. In this study, a laboratory-scale AGMD system was designed and constructed, and its performance was evaluated under operating conditions with very low Reynolds numbers. Experiments were conducted using three key parameters: feed water temperature, salinity, and air gap thickness, each tested at different levels. The results show that increasing the feed water temperature leads to an increase in the production rate of fresh water, while higher salinity and greater air gap thickness negatively affects the performance. However, the reduction in permeate flux is quite limited, and even at salinities twice that of seawater, the performance drop is less than 20%. Furthermore, the decline in system efficiency at high salinity and with larger air gaps is relatively mild. On the other hand, although increasing the air gap thickness reduces the desalination performance of the AGMD system, this negative effect becomes less significant as the air gap thickens further.

کلیدواژه‌ها [English]

  • Membrane distillation
  • air gap
  • desalination
  • operational parameters

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مقالات آماده انتشار، پذیرفته شده
انتشار آنلاین از تاریخ 18 بهمن 1404

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  • تاریخ دریافت: 23 آبان 1404
  • تاریخ بازنگری: 09 دی 1404
  • تاریخ پذیرش: 30 دی 1404
  • تاریخ انتشار: 18 بهمن 1404

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