Nano-suyuqliklarda issiqlik uzatish jarayonining viskoz dispersiv modellashtirilishi.
Abstract
mazkur tadqiqotda nano-suyuqliklarda issiqlik uzatish jarayonining viskoz-dispersiv modellashtirilishi termogidrodinamik nuqtayi nazardan chuqur o‘rganilgan. Tadqiqotning ilmiy yangiligi shundaki, unda issiqlik oqimini faqat konduktiv va konvektiv komponentlar orqali emas, balki viskoz dispersiv oqim orqali ham tahlil etish usuli taklif etiladi. Ushbu yondashuv nano-o‘lchamdagi zarrachalarning suyuqlik ichidagi mikroshearlanish, Brown harakati, termodiffuziya va nanoqurilmaviy interfaol qatlam hosil bo‘lishi bilan bog‘liq energiya almashinuvi mexanizmlarini o‘z ichiga oladi. Tadqiqotda Navye–Stoks va energiya tenglamalari asosida viskoz dispersiya koeffitsienti D_vnazariy jihatdan chiqarildi va uni hisoblash uchun o‘lchamsiz komplekslar (Reynolds, Prandtl, Peclet sonlari) bilan bog‘liqligi aniqlanadi. Model analitik va sonli metodlar integratsiyasida yechildi. Natijalar shuni ko‘rsatdiki, dispersiv ta’sir 1–3% hajmiy konsentratsiyali Al₂O₃–suv nano-suyuqligida issiqlik uzatish samaradorligini 18–27% gacha oshiradi, bu esa an’anaviy modellarga nisbatan yuqori moslikka ega bo‘ldi. Tadqiqot nano-issiqlik tizimlari, mikrokanalli issiqlik almashinish apparatlari va elektron sovitish tizimlari loyihalashda qo‘llanishi mumkin.
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