Experimental study of heat tranfer augmentation using air bubble injection and (Al2O3 water)‎ nanofluid flow in double pipe heat exchangers

Other Title(s)

دراسة تجريبية لزيادة نقل الحرارة باستخدام حقن الفقاعات الهوائية و تدفق النانوفلويد Al2O3 Water في مبادلات حرارة مزدوجة الأنابيب

Joint Authors

al-Khafaji, Dirgham Abd al-Husayn Abd al-Hasan
Hadi, Haydar Shakir
Hamzah, Hamid Kazim

Source

The Iraqi Journal for Mechanical and Materials Engineering

Issue

Vol. 21, Issue 2 (30 Jun. 2021), pp.96-117, 22 p.

Publisher

University of Babylon College of Engineering

Publication Date

2021-06-30

Country of Publication

Iraq

No. of Pages

22

Main Topic

Mechanical Engineering

Topics

Abstract EN

In the present work, an experimental study on how to increase the heat transfer coefficient (HTC) in double pipe heat exchanger (DPHE) use of a variety of Al2O3 Nano-dispersion concentrations mixed in water as base fluid with air bubble injection for counter flow arrangement under turbulent flow conditions with (Re) Reynold number range from (6000 t0 45000) .

The thermal performance of (DPHE) has been enhanced with the use of two techniques.

The first, is represented by adding nanoparticles to hot water (inner pipe) raising the (HTC) inside the inner tube.

Increase the volume concentration cause increase in the viscosity of the nanofluid leading to increase in friction factor .Secondly is represented by Air bubble injection in outer pipe with cold water to enhance the (HTC).

The mobility of air bubbles inside the water from down to up by the force of the buoyancy, and the movement of these air bubbles results in significant mixture and turbulence within the water.

The variations of number of thermal units (NTU), exergy loss, dimensionless exergy and (Nu) are evaluated.

The investigated parameters were cold water volume flow rates (8, 10, 12 and14) l/min, flow in outer tube.

Also, three different volume flow rates of air (12, 16 and 20) l/min mixed with water in outer tube.

The volume flow rates of hot water remains constant at (8 l/min) flow in inner pipe with three volumetric concentrations of given nanofluid.

The results showed that the air bubble injection throughout the tube gave maximum enhancement in heat transfer characteristics followed by the no air bubble injection.

Since the enhancement in heat transfer characteristics varies linearly with the volumetric concentration of Nanofluids, Nanofluids with 0.3% of Al2O3 nanoparticles gave more enhancements in (HTC) than the case without nanofluid.

The Nusselt number increased about (8% - 45%).

American Psychological Association (APA)

al-Khafaji, Dirgham Abd al-Husayn Abd al-Hasan& Hamzah, Hamid Kazim& Hadi, Haydar Shakir. 2021. Experimental study of heat tranfer augmentation using air bubble injection and (Al2O3 water) nanofluid flow in double pipe heat exchangers. The Iraqi Journal for Mechanical and Materials Engineering،Vol. 21, no. 2, pp.96-117.
https://search.emarefa.net/detail/BIM-1258552

Modern Language Association (MLA)

Hamzah, Hamid Kazim…[et al.]. Experimental study of heat tranfer augmentation using air bubble injection and (Al2O3 water) nanofluid flow in double pipe heat exchangers. The Iraqi Journal for Mechanical and Materials Engineering Vol. 21, no. 2 (Jun. 2021), pp.96-117.
https://search.emarefa.net/detail/BIM-1258552

American Medical Association (AMA)

al-Khafaji, Dirgham Abd al-Husayn Abd al-Hasan& Hamzah, Hamid Kazim& Hadi, Haydar Shakir. Experimental study of heat tranfer augmentation using air bubble injection and (Al2O3 water) nanofluid flow in double pipe heat exchangers. The Iraqi Journal for Mechanical and Materials Engineering. 2021. Vol. 21, no. 2, pp.96-117.
https://search.emarefa.net/detail/BIM-1258552

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references : p. 116-117

Record ID

BIM-1258552