کاربرد دینامیک سیالات محاسباتی (CFD) برای مدل سازی سامانه نمک زدایی فراصوت

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران، ایران

چکیده

چکیده
به دلیل کاهش منابع آب شیرین، رشد روزافزون جمعیت، افزایش فعالیت ­های صنعتی و تغییر استانداردهای زندگی مردم، افزایش مصرف آب و به تبع آن، بحران آب به سرعت در جهان و به ­خصوص در ایران در حال رشد است. انواع سیستم­های نمک­زدایی از آب ساخته و استفاده شده است که هرکدام معایب و مزایای خاص خود را دارند که در اکثر این سیستم­ها، میزان مصرف انرژی بالا مشکل اساسی به حساب می ­آید. ترکیب دستگاه­ های آب­شیرین­کن با فناوری فراصوت، یکی از تکنولوژی­ های جدید برای بهبود وضعیت مصرف انرژی این دستگاه ­ها است. در این تحقیق شبیه­ سازی سیالاتی-دینامیکی سامانه آب­ شیرین­ کن فراصوت توسط نرم­ افزار ANSYSCFX انجام پذیرفت. نتایج حاصل از شبیه ­سازی عددی با نتایج آزمایش­های تجربی صحه ­گذاری شدند. دو نوع سیال یکی هوای داغ ورودی به سامانه و دیگری سیال حاوی مخلوط بخار آب و NaCl به عنوان ورودی ­های سامانه در شبیه ­سازی عددی تعریف شدند. هدف اصلی از این تحقیق بررسی میزان املاح موجود در خروجی سامانه آب­ شیرین­ کن فراصوت بود  با توجه به نتایج عددی مقدار این املاح در خروجی تقریبا مقدار ­­­2­% از کل املاح اولیه موجود در آب بود. همینطور نتیجه شد که به منظور عملکرد بهینه آب ­شیرین ­کن فراصوت باید مقدار سرعت هوای داغ ورودی به سامانه کاهش یابد. به­ منظور صحه ­گذاری از دماهای ورودی و خروجی سیال حاوی مخلوط بخار آب و NaCl استفاده شد که اختلاف بین نتیجه حاصل از شبیه­ سازی عددی با نتیجه حاصل از آزمایش تجربی، مقدار 15­% شد که این مقدار خطا نشان می­دهد که می­توان از نتایج شبیه­ سازی با اطمینان استفاده کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Computational Fluid Dynamics (CFD) Application for Ultrasonic Desalination System Modeling

نویسندگان [English]

  • Behnam Hosseingholilou
  • Ahmad Benakar
Department of Mechanical Engineering of Biosystems, Faculty of Agricultural, University of Tarbiat Modares, Tehran, Iran
چکیده [English]

Abstract
Due to the reduction of fresh water resources, increasing population growth, increasing industrial activities and changing people's living standards, water consumption increases consequently and water crisis is rapidly growing around the world, especially in Iran. A variety of desalination systems have been developed and used with their common advantages and disadvantages. High energy consumption is a major problem in most of the desalination systems. Linking desalination systems with ultrasound technology is one of the novel technologies to improve the energy consumption of these systems. In this research, fluid-dynamic simulation of ultrasound desalination system was performed by ANSYSCFX software. The results of numerical simulations were validated with the results of experimental tests. Two types of fluids: hot air entering the system and a mixture of vapor and NaCl were defined as the system inputs in the numerical simulation. Investigating the solutes amount in system's output of the ultrasound desalination system was the aim of this research. It was shown that according the numerical results, the amount of these solutes in the output was approximately 2% of the total primary solutes in the water. It was also concluded that in order to increase the efficiency of the system, the hot air amount entering the system should be decreased. In order to validate the inlet and outlet temperature, fluid containing a mixture of vapor and NaCl was used. The difference in results of the numerical simulation and the experimental tests was just 15%, which indicates that the simulation results are trustful.

کلیدواژه‌ها [English]

  • Keywords: ANSYSCFX
  • CFD
  • desalination
  • Ultrasound
  • Validation
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