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147084

Enhancing Forced Convection Heat Transfer in Annular Tubes by Using Aluminum Mesh Layers.

Article

Last updated: 04 Jan 2025

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Tags

Mechanical Power Engineering

Abstract

An experimental investigation of heat transfer and pressure drop for turbulent flow of air in an annular tube of 48.1 mm outside diameter and 24.4 mm inside tube diameter are conducted. The inner tube, which is made of polished aluminum, heated under constant heat flux and winded by aluminum mesh-layers, while the outer tube is made of plastic (PVC) and insulated from outside with glass wool. Mesh-layers are used as an augmentative device with different thickness (2.3 ≤ t ≤11.9 mm). Reynolds number varied between 3000 and 20000 and Prandtle number was about 0.7. Friction factor are found to be 2.14 : 106.8 times the empty annular tube values, while Nusselt number are found to be 1.8: 3.7 times the empty annular tube at the same Reynolds number. The Nusselt numbers are found to be 1.29: 5.2 times the empty annular tube values based on constant pumping power and constant heat transfer area, a maximum reduction in pumping power of 76% can be achieved with augmented annular tubes. It is concluded that the use of this class of augmentative device is generally more effective for the case when mesh-layers thickness (t) is nearly equal to 2.3 mm (t/ᵟ = 0.1925, where ᵟ is annular gap thickness). Finally, correlations are developed for the prediction of friction factors and Nusselt number.

DOI

10.21608/bfemu.2021.147084

Authors

First Name

Ahmed Abd El-Razik

Last Name

Sultan

MiddleName

Ahmed

Affiliation

Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Email

-

City

Mansoura

Orcid

-

First Name

Gamal

Last Name

Sultan

MiddleName

Ibrahim Ahmed

Affiliation

Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Email

gisultan@mans.edu.eg

City

Mansoura

Orcid

-

Volume

25

Article Issue

4

Related Issue

21256

Issue Date

2000-12-01

Receive Date

2000-08-11

Publish Date

2021-02-07

Page Start

15

Page End

28

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 25_Issue 4_Pages 15-28.pdf

PDF . 194.5kB

Link

https://bfemu.journals.ekb.eg/article_147084.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=147084

Order

5

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

Enhancing Forced Convection Heat Transfer in Annular Tubes by Using Aluminum Mesh Layers.

Details

Type

Article

Created At

22 Jan 2023