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131403

Experimental Investigation of Forced Convection Heat Transfer from Outer Surface of Annular Tube with Rotating Inner Tube.

Article

Last updated: 04 Jan 2025

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Tags

Mechanical Power Engineering

Abstract

The paper presents an experimental study of laminar forced convection heat transfer in different rotational speeds varies from 100 to 628 r.p.m to give rotational Reynolds number in the range 2000 ≤ Reω≤ 29400. The inner tube of the annulus is varied so as to give radii ratios of 0.3879, 0.614 and 0.8842. Water is flowed axially through the annular space with velocities ranged from 0.00414 to 0.27 m/s to give axial Reynolds number in the range 80 ≤ Reh ≤ 2700 to cover the laminar flow regime. The outer tube of the annulus is cooled under uniform temperature via the evaporation of refrigerant R 22 flowing through a refrigeration circuit while the inner tube of the annulus is thermally insulated. In the present work the effect of radius ratio, axial Reynolds number and rotational Reynolds number on the heat transfer are subjects of major inertest.
The experimental results of this work show that the heat transfer of the rotational as well as the stationary annular tubes increase with the increase of the radius ratio of the annulus. The results show also that heat transfer of the rotational annular tubes is higher than this of the stationary ones at the same radius ratio and axial Reynolds number. There are peak values of heat transfer at a rotational Reynolds number of nearly 12725 (rotational speed of 270 rpm nearly) for different radius ratio of the annulus. An increase as much as 44 % in the heat transfer is reported for annular tube of radius ratio of 0.8842 and rotational speed of 270 rpm. Excellent correlation is established between Nusselt number and axial Reynolds number, rotational Reynolds number and radius ratio of the annulus for both rotational and stationary annular tubes.

DOI

10.21608/bfemu.2020.131403

Authors

First Name

Y.

Last Name

Abdel-Ghaffar

MiddleName

E.

Affiliation

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

Email

yeghafar@mans.edu.eg

City

Mansoura

Orcid

-

First Name

Ahmed

Last Name

Ahmed Sultan

MiddleName

Abd El-Razek

Affiliation

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

Email

-

City

Mansoura

Orcid

-

Volume

30

Article Issue

2

Related Issue

19435

Issue Date

2005-06-01

Receive Date

2006-04-11

Publish Date

2020-12-21

Page Start

41

Page End

52

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 30_Issue 2_Pages 41-52.pdf

PDF . 422.5kB

Link

https://bfemu.journals.ekb.eg/article_131403.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=131403

Order

6

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

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

MainTitle

Experimental Investigation of Forced Convection Heat Transfer from Outer Surface of Annular Tube with Rotating Inner Tube.

Details

Type

Article

Created At

22 Jan 2023