THERMAL SCIENCE

International Scientific Journal

Qusay Kamel Jasim

,

Noah Mohammed Saleh

,

Adnan Mohammed Hussein

IMPROVING THERMAL PERFORMANCE USING AL2O3-WATER NANOFLUID IN A DOUBLE PIPE HEAT EXCHANGER FILLING WITH POROUS MEDIUM

ABSTRACT
A double pipe heat exchanger is significant device for many industrial applications. In this paper, an experimental study using both porous media and nanofluid to enhance heat transfer in a double pipe heat exchanger is performed. The test rig has been fabricated with inner copper pipe of 1.10 m length, 16 mm, and 14 mm outside and inside diameter, respectively. While, the outer PVC pipe is 1 m length, 31 mm, and 27 mm outside and inside diameter, respectively. The inner pipe has been filling with 3 mm diameters of steel balls porous media. The experimental tests were performed utilizing alumina nanofluid (Al2O3-water) with two volume concentrations 0.5% and 1%. The volume flow-rates are in the range of (2-5) Lpm and 10 Lpm through inner and outer pipe, respectively. It was conducted with a constant 28ᵒC inlet temperature of cold fluid-flow inside the inner pipe and 50ᵒC inlet temperature of hot fluid-flow inside the outer pipe. Results indicated that the heat transfer enhanced as nanofluid volume concentrations and volume flow-rates increase. It was observed that effectiveness increases as increase of flow-rate and nanofluid concentrations.
KEYWORDS
heat exchanger, effectiveness, NTU, nanofluid, porous media
PAPER SUBMITTED: 2019-06-02
PAPER REVISED: 2019-10-12
PAPER ACCEPTED: 2020-01-29
PUBLISHED ONLINE: 2020-02-08
DOI REFERENCE: https://doi.org/10.2298/TSCI190602056J
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 6, PAGES [4267 - 4275]
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Improving thermal performance using Al2O3-water nanofluid in a double pipe heat exchanger filling with porous medium

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