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157717

Augmentation of Laminar Flow Heat Transfer in Annular Flat Tubes by Means of Helical Screw-tape Inserts in the Inner Tube.

Article

Last updated: 22 Jan 2023

Subjects

-

Tags

Mechanical Power Engineering

Abstract

The heat transfer characteristics and friction factor in horizontal double pipes of flat tubes with full length helical screw element of different twist ratio and helical screw inserts with different spacer length are investigated. Cold and hot water are used as working fluid in tube side and shell side respectively. The experiments covered a range of Reynolds numbers 5.7*102 ≤ Re ≤ 1.31*103. The effect of spacer length and twist ratio on the heat transfer augmentation and friction factor on heat transfer have been presented separately. The study shows that, Nusslet number (Nu) and friction factor (f) decrease with the increase of spacer length (S) and twist ratio (Y) for flat tube. The comparison between the data of present plain circular tube with that of previous plain circular tubes showed good agreement but the data of present plain flat tube showed a higher in heat transfer and pressure drop than that of plain circular tube. The correlations of average Nusselt number and friction factor with Re, S and Y are presented.

DOI

10.21608/bfemu.2021.157717

Authors

First Name

Emad

Last Name

Ibrahim

MiddleName

Zidan

Affiliation

Professor of Mechanical Power Engineering Department., Faculty of Engineering., Zagazig University., Zagazig., Egypt.

Email

emadz20022000@yahoo.com

City

Zagazig

Orcid

-

Volume

34

Article Issue

3

Related Issue

18584

Issue Date

2009-09-01

Receive Date

2009-06-11

Publish Date

2021-03-18

Page Start

44

Page End

71

Print ISSN

1110-0923

Online ISSN

2735-4202

Link

https://bfemu.journals.ekb.eg/article_157717.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=157717

Order

10

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

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

MainTitle

-

Details

Type

Article

Created At

22 Jan 2023