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Inward Melting inside a Horizontal Multilobed Capsule with Conductive Wall Affected by Ag-MgO/Water Hybrid and MgO/Water Nanofluids | ||
| Journal of Heat and Mass Transfer Research | ||
| دوره 8، شماره 2 - شماره پیاپی 16، بهمن 2021، صفحه 205-223 اصل مقاله (2.68 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2021.22194.1326 | ||
| نویسندگان | ||
| Mohammad Hassan Shojaeefard1؛ Mahmoud Jourabian* 2؛ Ahmad Ali Rabienataj Darzi3؛ Ali Bayat4 | ||
| 1Mechanical Engineering Department, Iran University of Science and Technology (IUST) | ||
| 2Department of Mechanical Engineering, Iran University of Science and Technology (IUST) | ||
| 3Department of Mechanical Engineering, University of Mazandaran, Babolsar, Mazandaran, Iran | ||
| 4Department of Civil Engineering, Islamic Azad University, Arak Branch, Arak, Markazi, Iran | ||
| تاریخ دریافت: 04 دی 1399، تاریخ بازنگری: 05 آذر 1400، تاریخ پذیرش: 09 آذر 1400 | ||
| چکیده | ||
| We scrutinize the possibility of boosting the functionality of an isothermally heated horizontal capsule filled with the phase change material (PCM) as the thermal energy storage (TES) system. There is the conjugate heat transfer at the wall. The constrained inward melting of the water/ice (Pr=6.2) at Ra=105 in this system should be improved since the thermal conductivity of the base PCM is low. The thermal performance of the PCM may be manipulated by adding the magnesia (MgO) and hybrid Ag/MgO nanoparticles and by using the multilobed capsules. The iterative explicit lattice Boltzmann method (LBM) is implemented to investigate the effects of the nanoparticle loading, aspect ratio (AR) and circumference of the cross-section on the full melting time. The use of the 2-lobe capsule with the highest AR and increased circumference reduces the full melting time by 37% in contrast to the pure PCM melting in the cylindrical tube. Using the MgO nanoparticles with a lower loading (0.01) within the 2-lobe capsule diminishes the complete melting time for the pure PCM by 55%. It is the best nanofluid-based case when we consider the price of nanoparticles and the capacity of the TES system. The hybrid nanoparticles/PCM composites with (50:50) weight proportions are not prescribed as the increment of the viscosity of the PCM is further than that of the thermal conductivity of the PCM. To decrease the thermal conduction resistance at the bottom section of the horizontal cylindrical capsule, it is suggested to use the multilobed capsule for the pure PCM melting instead of the expensive single nanoparticles. | ||
| کلیدواژهها | ||
| Lattice Boltzmann؛ Conjugate heat transfer؛ Constrained inward melting؛ Multilobed capsule؛ Hybrid nanoparticles؛ Conductive wall | ||
| عنوان مقاله [English] | ||
| ذوب به سمت داخل درون یک کپسول افقی چندلوبی با دیواره هدایتی تحت تاثیر نانوسیال ترکیبی Ag-MgO/water و نانوسیال MgO /water | ||
| چکیده [English] | ||
| ما امکان تقویت عملکرد یک کپسول افقی که به صورت همدما گرما داده شده است و توسط ماده تغییر فاز (PCM) پر شده است را به عنوان سیستم ذخیره انرژی حرارتی (TES) بررسی می کنیم. انتقال حرارت مزدوج در دیواره وجود دارد. ذوب محدودشده به سمت داخل آب/یخ (Pr=6.2) در عدد رایلی Ra=105 در این سیستم باید بهبود یابد زیرا هدایت حرارتی ماده تغییر فاز پایه کم است. عملکرد حرارتی ماده تغییر فاز ممکن است با افزودن نانوذرات (MgO) و نانوذرات ترکیبی Ag/MgO و با استفاده از کپسول های چند لوبی تحت تاثیر قرار بگیرد. روش شبکه بولتزمن صریح تکراری (LBM) برای بررسی اثرات بارگذاری نانوذرات، نسبت ابعاد (AR) و محیط سطح مقطع بر زمان کامل ذوب به کار برده میشود. استفاده از کپسول 2 لوبی دارای بالاترین AR و محیط سطح مقطع افزایش یافته، زمان ذوب کامل را تا 37 درصد نسبت به ذوب PCM خالص در یک لوله استوانهای کاهش میدهد. استفاده از نانوذرات MgO با بارگذاری کمتر (0.01) در کپسول 2 لوبی، زمان ذوب کامل PCM خالص را تا 55 درصد کاهش میدهد. وقتی قیمت نانوذرات و ظرفیت سیستم TES را در نظر بگیریم، این بهترین مورد مبتنی بر نانوسیال است. مخلوط PCM و نانوذرات ترکیبی با نسبت وزنی (50:50) توصیه نمی شوند زیرا افزایش ویسکوزیته PCM بیشتر از هدایت پذیری حرارتی PCM است. برای کاهش مقاومت هدایتی حرارتی در بخش پایینی کپسول استوانهای افقی، پیشنهاد میشود از کپسول چند لوبی برای ذوب PCM خالص به جای نانوذرات گران قیمت تنها استفاده شود. | ||
| کلیدواژهها [English] | ||
| شبکه بولتزمن, انتقال حرارت مزدوج, ذوب به سمت داخل محدود شده, کپسول چندلوبی, نانوذرات ترکیبی, دیواره هدایتی | ||
| مراجع | ||
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