مروری بر مطالعات پیشین بهبود عملکرد انتقال حرارت درون لوله دریافت کننده برج خورشیدی توسط تعبیه المان هایی درون لوله‌های دریافت کننده
Subject Areas : Journal of New Applied and Computational Findings in Mechanical Systems
Hadi
Farjadmehr
1
(گروه مهندسی مکانیک، موسسه آموزش عالی اروندان خرمشهر، خرمشهر، ایران)
Navid
Bozorgan
2
(Department of Mechanical Engineering, Abadan Branch, Islamic Azad University, Abadan, Iran)
Alireza
Daneh-Dezfuli
3
(Department of Mechanical Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz,
Ahvaz, Iran.)
Keywords: شار حرارتی متغیر, مبدل‌های حرارتی, اینسرت, ضریب کارایی,
Abstract :
مبدل‌های حرارتی که به‌طور گسترده در حوزه‌های زیادی از قبیل صنابع نفت و گاز، صنایع شیمیایی، تبرید، تهویه مطبوع، برج های خورشیدی، انرژی زمین گرمایی و ... استفاده می‌شود، تجهیراتی مهم و حیاطی جهت انتقال حرارت به شمار می‌روند. مهم‌ترین پارامترها جهت طراحی وبکارگیری مبدل حرارتی کاهش اندازه و هزینه‌ی آن، ضریب انتقال حرارت و افت فشار یا مقاومت در برابر جریان می‌باشد. اغلب افزایش ضریب انتقال حرارت، افزایش ضریب اصطکاک جریان و متعاقب آن افزایش افت فشار یا مقاومت در برابر جریان را در پی دارد که این امر باعث کاهش بازدهی سیستم می گردد .اساسی ترین چالش اصلی در طراحی مبدل‌های حرارتی کمینه کردن مقاومت در برابر جریان در حین افزایش ضریب انتقال می باشد. بنابراین، ایجاد یک نظریه و روش برای تقویت انتقال حرارت در جریان لوله برای بالا بردن عملکرد مبدل حرارتی ضروری است. اصول تقویت انتقال حرارت در جریان مرکزی لوله برای بهبود یکنواختی دما و کاهش مقاومت در برابر جریان که با تقویت انتقال حرارت در جریان مرزی درون لوله متفاوت است. بدین منظور ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ اﺛﺮ دوﮔﺎﻧﻪ میدان ﺑﺮ رﻓﺘﺎر ﺗﺮﻣﻮﻫﯿﺪروﻟﯿﮑﯽ ﺳﯿﺴﺘﻢ، از ﻣﻔﻬﻮم کارایی ﮐﻪ در ﺑﺮ دارﻧﺪه ﻫﻤﺰﻣﺎن اﺛﺮ ﺿﺮﯾﺐ اﻧﺘﻘﺎل ﺣﺮارت و ﺿﺮﯾﺐ اﺻﻄﮑﺎک جریان اﺳﺖ، جهت انتخاب مبدل های حرارتی کاربرد دارد .
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