fa بررسی عددی مبدل حرارتی یک هواپیمای تجاری و بهینه‌سازی آن با استفاده از مولد گرداب مبدل های حرارتی Heat exchangers پژوهشي Research <div style="text-align: justify;"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><span lang="FA" dir="RTL" style="font-family:"B Nazanin""></span></span></span> <div style="border-bottom:solid windowtext 1.0pt; padding:0in 0in 1.0pt 0in"><span style="font-size:9pt"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">مبدل‌های</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">حرارتی</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">خنک</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">شونده</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">با</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">هوا</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">بخش</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">مهمی</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">از</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">فناوری</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">صنعتی</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">در</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">حوزه</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">انتقال</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">حرارت</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">را</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">شامل</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">می &shy;شوند</span></span><span dir="LTR" style="font-size:10.0pt">.</span><span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">در</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">میان</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">انواع</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">مختلف</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">مبدل‌های</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">حرارتی</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">که</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">در</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">صنایع</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">مختلف</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">برای</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">سرمایش</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">یا</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">گرمایش</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">سیالات</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">مورد</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">استفاده</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">قرار</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">می‌گیرند مبدل‌های</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">حرارتی</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">صفحه‌ای</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">از</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">جایگاه</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">ویژه‌ای</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">برخوردار</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">هستند.</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">مبدل&shy; های</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">حرارتی صفحه &shy;ای</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">به‌خاطر</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">مزیت‌های</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">خاص</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">خود</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">مانند</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">بازده</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">و انعطاف&shy; پذیری</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">بالا،</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">تلفات</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">حرارتی</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">و</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">هزینه‌ی</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">تعمیر</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">و نگهداری</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">کم،</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">تمیزکاری</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">راحت</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">و</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">جمع</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">و</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">جور</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">بودن نسبت</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">به</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">سایر مبدل &shy;ها دامنه</span></span><span dir="LTR" style="font-size:10.0pt">&shy;</span><span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">ی نفوذ</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">گسترده &shy;تری</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">داشته &shy;اند</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">که</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">این</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">امر</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">باعث</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">انجام اقدامات</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">زیادی</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">در</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">حوزه &shy;ی</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">تحقیق</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">و</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">توسعه&shy; ی مبدل‌های</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">صفحه &shy;ای</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">شده</span></span> <span lang="FA" style="font-size:11.0pt"><span b="" nazanin="" style="font-family:">است. در این مقاله برای افزایش عملکرد انتقال حرارت مبدل حرارتی صحفه‌ای پره‌دار با استفاده از مولد گرداب، تغییر در شکل هندسی پره‌ها و تغییر در مسیر صفحات مبدل حرارتی بررسی شده است. هنگامی‌که جریان سیال از مولد گرداب عبور می‌کند، با توجه به جدایی جریان در لبه مولد گرداب، گرداب‌هایی در جهت جریان در میدان جریان تولید می‌شود که باعث اختلاط در بخش عمده جریان و تغییر در لایه مرزی و بی ثباتی آن می‌شود. در این تحقیق انتقال حرارت در یک مبدل حرارتی صفحه‌ای پره‌دار با استفاده از نرم‌افزار کانورج استودیو شبیه‌سازی و محاسبه عددی شده است. از میان مدل‌های توربولانسی مدل </span></span><span dir="LTR" style="font-size:10.0pt">k-ɛ</span><span style="font-size:11.0pt"><span b="" nazanin="" style="font-family:"> استفاده شده است که نتایج بهتری را ارائه می‌دهد و نتایج آن با یک نمونه از مبدل‌های حرارتی صفحه‌ای که طراحی و ساخته شده، مقایسه شده است. با تغییر در شکل هندسی پره‌ها و با تغییر در مسیر صفحات مبدل حرارتی، تغییر رژیم جریان هوای عبوری از صفحات مبدل حرارتی بررسی شده است. نتایج نشان می‌دهد در محدوده رینولدز 1965324با دمای هوای گرم ورودی 616 درجه کلوین و دمای هوای سرد ورودی 222 درجه کلوین در ارتفاع 10000 پا از سطح دریا راندمان 52 درصد به‌دست آمده است.</span></span></span></span></span></span></div> </div> <div style="text-align: justify;"> <div><span style="font-size:11pt"><span style="line-height:120%"><span style="font-family:Calibri,sans-serif"><span style="font-family:"Times New Roman",serif"></span></span><span b="" nazanin="" style="font-family:"><span style="font-size:10.0pt"><span style="line-height:120%"><span new="" roman="" style="font-family:" times="">Air-cooled heat exchangers are an important part of industrial technology in the field of heat transfer. Among the different types of heat exchangers used in various industries for cooling or heating fluids, plate heat exchangers have a special place. Plate heat exchangers have a wider scope of influence than other exchangers due to their specific advantages such as high efficiency and flexibility, low heat losses and maintenance costs, easy cleaning and compactness, which has led to many efforts in the field of research and development of plate</span></span></span><b> </b><span style="font-size:10.0pt"><span style="line-height:120%"><span new="" roman="" style="font-family:" times="">heat exchangers.</span></span></span></span></span></span></div> <div style="border-bottom:solid windowtext 1.0pt; padding:0in 0in 1.0pt 0in"><span style="font-size:11pt"><span style="line-height:120%"><span b="" nazanin="" style="font-family:"><span style="font-size:10.0pt"><span style="line-height:120%"><span new="" roman="" style="font-family:" times="">In this paper, in order to increase the heat transfer performance of a plate-fin heat exchanger using a vortex generator (Eddy), changes in the geometric shape of the fins and changes in the direction of the heat exchanger plates have been investigated. When the fluid flow passes through the vortex generator, due to the flow separation at the edge of the vortex generator, vortices are generated in the flow direction in the flow field, which causes mixing in the bulk of the flow and changes in the boundary layer and its instability.In this study, heat transfer in a finned plate heat exchanger has been simulated and calculated numerically using Converge Studio software. Among the turbulence models, the k-ɛ model has been used, which provides better results, and its results have been compared with a sample of plate heat exchangers that have been designed and manufactured. By changing the geometric shape of the fins and changing the direction of the heat exchanger plates, the change in the air flow regime passing through the heat exchanger plates has been investigated. The results show that in the Reynolds number range of 1965324 with a hot air inlet temperature of 616 degrees Kelvin and a cold air inlet temperature of 222 degrees Kelvin at an altitude of 10,000 feet above sea level, an efficiency of 52 percent has been achieved.</span></span></span></span></span></span></div> </div> محاسبه عددی–مبدل حرارتی–گرداب مولد- مبدل حرارتی صفحه‌ای پره‌دار Numerical calculation, heat exchanger, vortex generator(Eddy), finned plate heat exchanger 1 16 http://jeed.dezful.iau.ir/browse.php?a_code=A-10-405-1&slc_lang=fa&sid=1 Mohammad hassan Nobakhti محمدحسن نوبختی m.nobakhti@srbiau.ac.ir 10031947532846005456 10031947532846005456 Yes Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran گروه مکانیک، دانشکده مکانیک،برق و کامپیوتر، واحد علوم و تحقیقات تهران، دانشگاه آزاد اسلامی ،ایران Kayvan Akbarirad کیوان اکبری راد kayvan628@gmail.com 10031947532846005457 10031947532846005457 No Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran گروه مکانیک، دانشکده مکانیک،برق و کامپیوتر، واحد علوم و تحقیقات تهران، دانشگاه آزاد اسلامی ،ایران Ali Alinia علی علی نیا alialinia@srbiau.ac.ir 10031947532846005458 10031947532846005458 No Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran گروه مکانیک، دانشکده مکانیک،برق و کامپیوتر، واحد علوم و تحقیقات تهران، دانشگاه آزاد اسلامی ،ایران