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Hydro-Thermal Performance Evaluation of Nanofluids Flow in Double Pipe Heat Exchanger: Effects of Inner Pipe Cross Section, Circular or Cam-Shaped | ||
| Journal of Heat and Mass Transfer Research | ||
| دوره 8، شماره 2 - شماره پیاپی 16، بهمن 2021، صفحه 283-299 اصل مقاله (1.42 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2021.22159.1327 | ||
| نویسندگان | ||
| Aso Rezaei؛ Zahra Baniamerian* | ||
| Department of Mechanical Engineering, Tafresh University, Tafresh, Iran | ||
| تاریخ دریافت: 30 دی 1399، تاریخ بازنگری: 04 تیر 1400، تاریخ پذیرش: 07 تیر 1400 | ||
| چکیده | ||
| This study investigates numerically the hydro-thermal behavior of nanofluids in double-pipe heat exchangers with two different cross-sections using four different nanofluids. Two types of different circular and cam-shaped cross-sections, four types of different nanofluid of various concentrations are assessed. The results show that cam-shaped cross-section has reduced the heat transfer rate and the pressure drop compared to the circular cross-section. The heat transfer rate has been increased in both types of heat exchanger by increasing the concentration of nanoparticles, but the pressure drop and friction coefficient has been increased compared to pure water. The results of investigating energy ratio show that the highest performance evaluation criterion (PEC) is related to the silver nanoparticles and the energy ratio (PR) increases by increasing the percentage of nanoparticle concentration. But the energy ratio has been decreased for other nanoparticles by increasing the volume percentage of nanoparticles. The results of thermal and hydraulic studies show that the highest PR value is related to water/TiO2 nanofluid and cam pipes have a higher energy loss. Maximum heat transfer improvement for circular pipes is 26.74% related to Ag nanoparticles while this value is 21.15% for cam-shaped pipes. | ||
| کلیدواژه‌ها | ||
| Double-pipe heat exchanger؛ Cam-shape cross-section؛ Nanofluid؛ Heat transfer coefficient؛ Pressure drop؛ Energy ratio (PEC and PR) | ||
| عنوان مقاله [English] | ||
| بررسی هیدرو حرارتی نانوسیالات در مبدلهای حرارتی دولوله ای : اثر تغییر مقطع دایروی به بادامکی | ||
| چکیده [English] | ||
| این مطالعه به بررسی عددی انتقال حرارت ، افت فشار، کارایی و نسبت انرژی (PEC ) در مبدلهای دولوله-ای با دو سطح مقطع متفاوت و با استفاده از چهار نانوسیال مختلف می‌پردازد. اثرات پارامترهای سطح مقطع (دایره‌ای و بادامکی برای لوله‌ی داخلی)، چهار نوع نانوسیال مختلف، نرخ جریان گرم و سرد و غلظت نانوذرات مورد بررسی قرار گرفته است. نتایج نشان می‌دهد که تغییر سطح مقطع باعث کاهش نرخ انتقال حرارت و کاهش افت فشارنسبت به سطح مقطع دایره‌ای گردیده است. هچنین با افزایش غلظت نانوذرات میزان انتقال حرارت در هر دو نوع مبدل افزایش پیدا کرده ولی افت فشار و ضریب اصطکاک نیز نسبت به آب خالص افزایش یافته است. بالاترین PEC مربوط به نانوذره‌ی نقره می باشد و در این نانوذره با افزایش درصد غلظت نانوذرات نسبت انرژی افزایش می‌یابد. ولی برای دیگر نانوذرات با افزایش درصد حجمی نانوذرات نسبت انرژی کاهش یافته است. بالاترین مقدار PR مربوط نانو سیال آب / TiO2 می‌باشد. هنگام استفاده از لوله‌ی بادامک شکل عدد ناسلت کمتر از عدد ناسلت لوله‌ی دایروی می‌باشد، که باعث کم بودن نسبت انرژی گردیده و نشان می‌دهد لوله‌های بادامکی افت انرژی بیشتری دارند. همچنین در مبدل حرارتی دو لوله‌ای نرخ انتقال گرما هنگام استفاده از نانوسیالات آب /CuO، آب / Ag، آب/TiO2 و آب Al2O3 به ترتیب 16.2%، 26.74%، 12.48% و 11.62% درصد نسبت به آب خالص افزایش پیدا کرده است. در مبدل حرارتی دو لوله‌ای لوله بادامکی نرخ انتقال حرارت برای نانوسیالات آب /CuO و آب / Ag، آب/TiO2 و آب Al2O3 به ترتیب 16.25%، 21.15%، 13 و 12.55% افزایش داشته اند، ولی نرخ انتقال حرارت در مبدل لوله بادامکی نسبت به مبدل لوله دایروی کاهش داشته است. همچنین افزایش افت فشار و کارایی مبدل در مبدلهای دایروی و بادامکی به ترتیب 68.5% ، 15.41% و 39.42% ، 23.3% نسبت به آب خالص افزایش داشته است. از دو نرم‌افزار Aspen EDR و Fluent برای شبیه‌سازی این دو مبدل استفاده گردیده است. | ||
| کلیدواژه‌ها [English] | ||
| مبدل دو لوله‌ای, لوله بادامکی, نانوسیال, ضریب انتقال حرارت, افت فشار, نسبت انرژی | ||
| مراجع | ||
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