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114476

ENHANCEMENT OF HEAT TRANSFER THROUGH A SUDDEN EXPANSION PIPE AIRFLOW USING PROPELLER SWIRL GENERATOR

Article

Last updated: 26 Dec 2024

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Subjects

-

Tags

Mechanical, Power, Production, Design and Mechatronics Engineering.

Abstract

This investigation is aimed to study the heat transfer and pressure drop characteristics for turbulent airflow in a sudden expansion pipe (d/D = 0.72) equipped with propeller swirl generator with different blade angles. The investigation is performed for the Reynolds number ranging from 10,000 to 40,000 under a uniform heat flux condition. Four propeller fans of five blades with swirl angles, Ө = 15, 30, 45° for upstream flow, and 45° for downstream flow are inserted separately inside the test section. The swirl propeller fan is located at different locations inside the tested pipe, where S =10H, 20H and 40H for both upstream and downstream flows. The experimental results indicate that inserting the propeller upstream of the tube provides considerable improvement of the heat transfer rate up to 190% for all swirler angles with higher values obtained at Ө = 45°. Inserting the propeller downstream of the tube provides more improvement in heat transfer rate than inserting the propeller upstream of the tube at swirl angle of Ө = 45°, the heat transfer rate increased up to 225%. The maximum enhancement efficiency (η) for the downstream swirler is about 326% while it is about 213% for the upstream one. Correlations for relative mean Nusselt number and enhancement efficiency are presented for different fan locations, swirl angles and Reynolds numbers.

DOI

10.21608/jesaun.2012.114476

Keywords

Sudden Expansion, Swirl flow, Heat transfer augmentation

Authors

First Name

A. E.

Last Name

Zohir

MiddleName

-

Affiliation

Mechanical Engineering Department, Tabbin Institute for Metallurgical Studies, Cairo, Egypt,

Email

alaa_sadegh@yahoo.com

City

-

Orcid

-

First Name

A.G.

Last Name

Gomaa

MiddleName

-

Affiliation

Mechanical Eng. Dept., Industrial education College, Helwan University

Email

-

City

-

Orcid

-

Volume

40

Article Issue

No 4

Related Issue

16870

Issue Date

2012-07-01

Receive Date

2012-04-01

Publish Date

2012-07-01

Page Start

1,039

Page End

1,055

Print ISSN

1687-0530

Online ISSN

2356-8550

Article File

JESAUN_Volume 40_Issue No 4_Pages 1039-1055.pdf

PDF . 529.4kB

Link

https://jesaun.journals.ekb.eg/article_114476.html

Detail API

https://jesaun.journals.ekb.eg/service?article_code=114476

Order

6

Type

Research Paper

Type Code

1,438

Publication Type

Journal

Publication Title

JES. Journal of Engineering Sciences

Publication Link

https://jesaun.journals.ekb.eg/

MainTitle

ENHANCEMENT OF HEAT TRANSFER THROUGH A SUDDEN EXPANSION PIPE AIRFLOW USING PROPELLER SWIRL GENERATOR

Details

Type

Article

Created At

23 Jan 2023