Open AccessAssessment the Effect of Nanofluid on Turbulent Heat Transfer and Pressure Drop in Bend Finned Tube
Author(s) -
Nabil J. Yasin,
Kadhum Audaa Jehhef,
Zahraa A. Mohsen
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/518/3/032003
Subject(s) - nanofluid , nusselt number , materials science , pressure drop , heat exchanger , concentric tube heat exchanger , laminar flow , heat transfer , turbulence , mechanics , reynolds number , shell and tube heat exchanger , dynamic scraped surface heat exchanger , thermodynamics , heat transfer enhancement , micro heat exchanger , plate heat exchanger , heat transfer coefficient , critical heat flux , physics
An experimental study of using Al 2 O 3 -water nanofluid that flows in a finned bend tube cross flow heat exchanger on heat transfer and pressure drop was implemented. The experimental part consists of closed loop of water or nanofluid that flows in the bend tube heat exchanger that inserted in an air wind tunnel. The effect of different nanoparticles volume fraction of (0, 0.01, 0.05, 0.1 and 0.2%Vol.) were depressed in deionized water. The hot water or nanofluid flow in the two types of smooth and finned bend tube heat exchanger with different inlet Reynolds numbers for the range of (450-920) for laminar flow and (6900-10000) for turbulent flow. The experimental results were presented as a friction factor, local and average Nusselt number for the water and air side respectively for the smooth and finned bend tubes. The results show that the inner average Nusselt number of Al 2 O 3 -water nanofluid that flows in heat exchanger enhanced by up (34.6 %) for smooth tube heat exchanger and about (44.1 %) for finned bend tube heat exchanger compared to pure water. Also, the friction factor of the nanofluid flow inside the heat exchanger increase by up (13.9 %) for smooth bend tube heat exchanger and (22%) for finned bend tube as compared with the use of pure water.