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144800

Augmentation of Natural Convection Heat Transfer in Vertical Cylindrical Annulus.

Article

Last updated: 22 Jan 2023

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Tags

Mechanical Power Engineering

Abstract

In the present work, the natural convection heat transfer through vertical cylindrical annular tubes was experimentally investigated the inner cylinder is heated electrically with constant heat flux, while the outer one is subjected to ambient air. Rayleigh number was varied between 80 and 1500 throughout this investigation Aspect ratio of 50 and radius ratio of 1 5 were used. The annular gap was provided with helical-wire-eoil rings wound around the outer surface of the inner cylinder as augmentation devices. The effects of coil pitch, ring pitch, coil diameter and wire diameter were investigated from the results of the present investigation it is concluded that the heal transfer rate increases with increase of coil diameter and wire diameter and decrease of ring pitch, while it has a peak value at coil pitch to gap thickness nearly equal 0.125. It is eoncluded (rom the experimental results that the heat transferred through the annular gap is not only by convection but also by radiation and conduction. The helical-wire-coil rings are found to enhance heat transfer by a factor of 8.25. A general eorrelation is presented in order 10 help in the design of such devices 

DOI

10.21608/bfemu.2021.144800

Authors

First Name

Ahmed

Last Name

Ahmed Sultan

MiddleName

Abd El-Razik

Affiliation

Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., PO 35516, Mansoura., Egypt.

Email

-

City

Mansoura

Orcid

-

First Name

Y.

Last Name

Hassan

MiddleName

Z.

Affiliation

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

Email

-

City

Mansoura

Orcid

-

Volume

26

Article Issue

2

Related Issue

21250

Issue Date

2001-06-01

Receive Date

2001-02-11

Publish Date

2021-01-30

Page Start

1

Page End

14

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 26_Issue 2_Pages 1-14.pdf

PDF . 194.4kB

Link

https://bfemu.journals.ekb.eg/article_144800.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=144800

Order

12

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

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

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-

Details

Type

Article

Created At

22 Jan 2023