شبیه‌سازی جریان گرما-شاره در مبدل گرمایی با صفحۀ میانی الاستیک در شرایط کاری مختلف

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، دانشگاه تبریز، تبریز، ایران.

2 استادیار، گروه مهندسی مکانیک، دانشگاه بناب، بناب، ایران

چکیده

در این مقاله یک مبدل گرمایی صفحه‏ای با جریان ناهمسو در شرایط کاری مختلف بررسی شده است. 4حالت مختلف در جریان‏های لایه‏ای و آشفته با صفحۀ میانی صلب و الاستیک در اعداد رینولدز مختلف مطالعه شده و تأثیر الاستیک‌کردن صفحۀ جداکننده روی انتقال گرما و کارایی مبدل بررسی شده است. پروفیل سرعت سینوسی در ورودی کانال سرد به کار رفته است. نتایج این پژوهش نشان داد که الاستیک‌کردن صفحۀ میانی در هر 2جریان لایه‏ای و آشفته باعث بهبود انتقال گرما در مبدل گرمایی می‏شود. همچنین نتایج نشان داد که ضریب اصطکاک متوسط در مبدل گرمایی با صفحۀ میانی الاستیک از ضریب اصطکاک متوسط نسبت به مبدل گرمایی با صفحۀ میانی صلب بیشتر است. با تعریف کارایی و درنظرگرفتن هر 2عامل افزایش انتقال گرما و افزایش افت فشار، حالت‌هایی که کارایی کل مبدل گرمایی با صفحۀ الاستیک بیشتر از یک بود، تعیین شد. نتایج نشان داد که در اکثر مواقع این کارایی برای مبدل گرمایی با صفحۀ الاستیک بیشتر از یک است. نتایج نشان داد که حداکثر کارایی 2/5 است که در عدد رینولدز 3000 مشاهده شد و حداقل کارایی 9/0  است که در عدد رینولدز 200 اتفاق می افتد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Simulation of fluid flow in a heat exchanger with elastic intermediate separator at different working conditions

نویسندگان [English]

  • Seyed Esmael Razavi 1
  • Tohid Adibi 2
1 Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran
2 Department of Mechanical Engineering, University of Bonab, Bonab, Iran
چکیده [English]

In this work, a plate heat exchanger with an inconsistent flow is investigated in different working conditions. Four different models in laminar and turbulent flows with rigid and elastic plates at different Reynolds numbers have been studied, and the effect of the separator plate elasticity on the heat transfer rate and the efficiency of the heat exchanger has been investigated. A sinusoidal profile is used at the entrance to the cold passage. The results of this study showed that the elasticity of the intermediate plate in both laminar and turbulent flow has raised the heat transfer rate. Of course, in cases where the middle plane was elastic, the friction coefficient increased relative to the rigid plate. The efficiency of the heat exchanger is defined and is obtained for the heat exchanger to consider both heat transfer rate and pressure drop. Results showed that in most cases, the efficiency of the heat exchanger with elastic separator is more than one. The results showed that the maximum efficiency is 5.2 which was observed in Re=3000 and the minimum efficiency is 0.9 which occurs in Re=200.

کلیدواژه‌ها [English]

  • Heat exchanger
  • Elastic plate
  • Nusselt number
  • sinusoid velocity
  • Reynolds number

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