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Pressure drop and heat transfer characteristics of nanofluids in horizontal microtubes under thermally developing flow conditions

عنوان	Pressure drop and heat transfer characteristics of nanofluids in horizontal microtubes under thermally developing flow conditions
نویسنده	Karimzadehkhouei, M., Yalçın, S. E., Şendur, K., Mengüç, Mustafa Pınar, Koşar, A.
تاریخ انتشار:	2015-10
محل انتشار	- Elsevier
موضوع	Nanoparticle, Nanofluid, Single-phase flow, Friction factor, Heat transfer coefficient
نوع	دوره ای
زبان	انگلیسی
دیجیتال	بله
نسخه خطی	خیر
کتابخانه:	دانشگاه اوزیغین
شناسه دارایی کتابخانه	0894-1777
شماره ثبت	8d18b632-66ed-4d17-9728-818730a2c602
محل کتابخانه	Mechanical Engineering
تاریخ	2015-10
یادداشت‌ها	Due to copyright restrictions, the access to the full text of this article is only available via subscription.
متن نمونه	This study presents pressure drop and heat transfer characteristics of water based nanofluids with TiO2 and Al2O3 nanoparticles of various mass fractions in horizontal smooth hypodermic microtubes with an outer diameter of ∼717 μm and an inner diameter of ∼502 μm over a wide variety of Reynolds numbers under hydrodynamically fully developed and thermally developing conditions. For this purpose, TiO2 and Al2O3 nanoparticles of 20 nm average solid diameters were added to deionized water to prepare nanofluids with mass fractions of 0.01–3 wt.%, and prepared nanofluids were characterized by standard methods such as Dynamic Light Scattering (DLS), Scanning Electron Microscopy (SEM), and zeta potential measurements. Experimental friction factor coefficients were predicted within ±10% and are in good agreement with existing analytical predictions, while experimental heat transfer coefficients were predicted within ±15% with existing correlations for single phase flow. Our results show that there is no considerable heat transfer enhancement for Re < 1000. A consistent enhancement in heat transfer was observed (for average heat transfer coefficient up to 25%), once Reynolds number goes beyond 1500. At low Reynolds numbers, flow is mainly laminar. However, at higher Reynolds numbers, flow starts to transition to turbulent flow, when heat transfer enhancement is also observed. Under these conditions, the enhancement in heat transfer increases with mass fraction.
DOI	10.1016/j.expthermflusci.2014.10.013
Cilt	67

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دانشگاه اوزیغین

Pressure drop and heat transfer characteristics of nanofluids in horizontal microtubes under thermally developing flow conditions

نویسنده Karimzadehkhouei, M., Yalçın, S. E., Şendur, K., Mengüç, Mustafa Pınar, Koşar, A.

تاریخ انتشار 2015-10

محل انتشار - Elsevier

موضوع Nanoparticle, Nanofluid, Single-phase flow, Friction factor, Heat transfer coefficient

نوع دوره ای

زبان انگلیسی

دیجیتال بله

نسخه خطی خیر

کتابخانه دانشگاه اوزیغین

شناسه دارایی کتابخانه 0894-1777

شماره ثبت 8d18b632-66ed-4d17-9728-818730a2c602

محل کتابخانه Mechanical Engineering

تاریخ 2015-10

یادداشت‌ها Due to copyright restrictions, the access to the full text of this article is only available via subscription.

متن نمونه This study presents pressure drop and heat transfer characteristics of water based nanofluids with TiO2 and Al2O3 nanoparticles of various mass fractions in horizontal smooth hypodermic microtubes with an outer diameter of ∼717 μm and an inner diameter of ∼502 μm over a wide variety of Reynolds numbers under hydrodynamically fully developed and thermally developing conditions. For this purpose, TiO2 and Al2O3 nanoparticles of 20 nm average solid diameters were added to deionized water to prepare nanofluids with mass fractions of 0.01–3 wt.%, and prepared nanofluids were characterized by standard methods such as Dynamic Light Scattering (DLS), Scanning Electron Microscopy (SEM), and zeta potential measurements. Experimental friction factor coefficients were predicted within ±10% and are in good agreement with existing analytical predictions, while experimental heat transfer coefficients were predicted within ±15% with existing correlations for single phase flow. Our results show that there is no considerable heat transfer enhancement for Re < 1000. A consistent enhancement in heat transfer was observed (for average heat transfer coefficient up to 25%), once Reynolds number goes beyond 1500. At low Reynolds numbers, flow is mainly laminar. However, at higher Reynolds numbers, flow starts to transition to turbulent flow, when heat transfer enhancement is also observed. Under these conditions, the enhancement in heat transfer increases with mass fraction.

DOI 10.1016/j.expthermflusci.2014.10.013

Cilt 67