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Article
Experimental Comparison Between Conventional Coolants and (TiO2/Water) Nano fluid to select the best Coolant for Automobiles in Iraq's Summer Season

Author: Abdulmunem R. Abdulmunem
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 5 Part (A) Engineering Pages: 912-926
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This work, presentsnanofluids as a new coolant technology in automobile engines compared with other conventional coolants (Ethylene glycol/water(antifreeze), distilled water) experimentally.The increase in thermal conductivity of the base fluid (water) by adding nanoparticles in certain ratios led to more absorption of heat from engine block. The experimental results indicated that the drooping in exit engine coolant temperatures was about(18.5%) by using (0.3%TiO2/water)nanofluid, and about (9%) by using distilled water comparative with Ethylene glycol/water(50/50) at the test end. The increasing in radiator(heat exchanger) effectiveness was about (51%) with using nanofluid, and about (29%) with using distilled water comparative with Ethylene glycol/water(50/50) at the test end. The results indicated also that the increasing in Nusselt’s number at entrance of radiator hose was about (42.8%) with usingnanofluid and about (30.5%) with using distilled water compared with Ethylene glycol/water(50/50).This led to increase convection heat transfer coefficient at entrance of radiator hoseby about (65%) with using nanofluidand about (49.5%) with using distilled water compared with Ethylene glycol/water (50/50).


Article
Study and Analysis of Concentric Shell and Double Tube Heat Exchanger Using Tio2 Nanofluid

Authors: Bassma Abbas Abdulmajeed --- Noor Sabih Majeed
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2017 Volume: 18 Issue: 4 Pages: 15-23
Publisher: Baghdad University جامعة بغداد

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Abstract

In this paper, nanofluid of TiO2/water of concentrations of 0.002% and 0.004% volume was used. This nanofluid was flowing through heat exchanger of shell and concentric double tubes with counter current flow to the hot oil. The thermal conductivity of nanofluid is enhanced with increasing concentrations of the TiO2, this increment was by 19% and 16.5% for 0.004% and 0.002% volume respectively relative to the base fluid (water). Also the heat transfer coefficient of the nanofluid is increased as Reynold's number and nanofluid concentrations increased too. The heat transfer coefficient is increased by 66% and 49% for 0.004% and 0.002% volume respectively relative to the base fluid. This study showed that the friction factor of nanofluid was decreased as Reynold's number increased.

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