Rheology and Efficacy Analysis of Nanofluids

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

Cooling has become a major challenge for system design and performance in the fast growing technology. This development is pushing the conventional cooling methods to its limitation and there is an ever increasing call for new cooling methods to cope with current technologies. One of the possible ways of satisfying this demand is by introducing nanofluids as heat transfer fluids. Nanofluids are colloidal suspension of nanoparticles with enhanced thermal conductivity engineered for heat transfer application. Understanding the thermophysical property of nanofluids is crucial for their practical applications. The main objective of the present study is to investigate the viability of nanofluids for heat transfer applications. The applicability of Pump-probe technique for measurement of nanoscale thermal transport in nanofluids was investigated. Stable nanofluids of Copper, Zirconia, Silicon Carbide and Yttria in water and ethylene glycol base fluids were prepared by the conventional two step method without addition of surfactants. Particle size and zeta potential characterization of the nanofluids were carried out by electro-acoustic and DLS techniques. Yttria based nanofluids were found promising for their stability and dielectric properties. The viscosity of yttria nanolfuids increased with concentration almost linearly and showed an increment of around 3% at 0.1 vol% to 45 % at 5 vol% of particle. This increment was found beyond the prediction of Einstein or Batchelor theoretical models. The effective viscosity of these nanofluids showed non-linear dependence on temperature and this was due to particle-particle interaction which is observed from the higher orders fitting values of Arrhenius model. Theoretical analyses for the efficacy of Yttria and copper nanofluids are made for laminar and turbulent flow regimes. In laminar flow regimes, Yttria nanofluids showed promising results above 37oC and a maximum of 16% increase in efficiency was gained at working temperatures of 100oC. Similarly, Copper nanofluids were found viable for temperatures above 50oC with an efficiency gain of 7.5% maximum. In case of turbulent flow applications, Yttria nanofluids remain better coolants for temperature above 45oC despite of Copper nanofluids incompetence in the experimental range of temperature.

روابط وملفات

التعريف والنوع

رقم الوثيقة

01d5109d-1573-4aa9-bc93-3c832a617f0f

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

2284201_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Waka Tesfai","title_ar":"اعداد","title_en":"Preparation"},{"name_ar":"Youssef Shatilla","title_ar":"اشراف","title_en":"Supervision"}]

اللغة

English

المصدر والدورية

اسم المصدر

Rheology and Efficacy Analysis of Nanofluids

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

Biomedical Materials

إشراف وإعداد

الإشراف

Youssef Shatilla

الإعداد

Waka Tesfai

الاقتباسات الببليوغرافية