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Unsteady Heat Transfer in Cylindrical Encapsulated Phase Change Materials with Buoyancy Effect | ||
| Journal of Heat and Mass Transfer Research | ||
| دوره 11، شماره 2 - شماره پیاپی 22، بهمن 2024، صفحه 225-236 اصل مقاله (3.75 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2024.33230.1522 | ||
| نویسنده | ||
| Javad Rostami* | ||
| Razi University | ||
| تاریخ دریافت: 19 بهمن 1402، تاریخ بازنگری: 18 خرداد 1403، تاریخ پذیرش: 18 خرداد 1403 | ||
| چکیده | ||
| In this paper, the effect of buoyancy force on the temperature change of the phase change materials which has been encapsulated in two pipes in a channel, is simulated numerically using Boussinesq approximation. An application of this topic is in air-conditioning, which uses ice in the pipes as PCM for coolant and the aim is calculating the PCM discharging time. The unsteady governing equations including continuity, momentum and energy in the fluid flow and phase change material for laminar flow regime, have been solved by the well-known SIMPLE method. The needed time to phase change material reach the inlet temperature of the fluid flow has been obtained and compared to the results of the lumped temperature assumption. The results show that the discharging time is 4,000 for Gr=5,000 and 70,000 for Gr=200,000. It is 25,000 for kr=0.5 and 34,000 for kr=1.5. Also, it is 11,000 for Cpr=103 and 28,000 for Cpr=104. Finally, it has been concluded that due to the fine mixing of PCM because of buoyancy force, the results are so closed to the results of the lumped temperature assumption for PCM. | ||
| کلیدواژهها | ||
| PCM؛ Convective heat transfer؛ CFD؛ Latent heat, Sensible heat | ||
| عنوان مقاله [English] | ||
| انتقال حرارت گذرا در مواد تغییر فاز دهنده موجود در کپسولهای استوانهای با در نظر گرفتن نیروی شناوری | ||
| چکیده [English] | ||
| در این مقاله، اثر نیروی شناوری بر تغییر دمای مواد تغییر فاز که در دو لوله در یک کانال محصور شدهاند، به صورت عددی با استفاده از تقریب بوسینسک شبیهسازی شده است. این شبیه سازی در تهویه مطبوع کاربرد دارد. معادلات حاکم گذرا شامل پیوستگی، تکانه و انرژی در جریان سیال و مواد تغییر فاز برای جریان رژیم آرام، با روش معروف SIMPLE حل شده است. زمان لازم برای رسیدن مواد تغییر فاز به دمای ورودی جریان سیال بدست آمده و با نتایج حاصل از فرض دمای یکنواخت برای ماده تغییر فاز مقایسه شده است. نتایج نشان می دهد که زمان بی بعد ذوب برای Gr=5000 برابر با 4000 و برای Gr=200000 برابر با 70000 است. برای kr=0.5 برابر 25000 و برای kr=1.5 برابر 34000 است. همچنین برای Cpr=103 برابر 11000 و برای Cpr=104 برابر 28000 است. در نهایت نتایج نشان دادند که به علت اختلاط ماده تغییر فاز دهنده ناشی از نیروی شناوری، نتایج با نتایج روش ظرفیت کلی نزدیک و همخوانی داشت. | ||
| کلیدواژهها [English] | ||
| مواد تغییر فاز دهنده, انتقال حرارت جابهجایی, دینامیک سیالات محاسباتی, گرمای نهان, گرمای محسوس | ||
| مراجع | ||
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