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Natural Convection between a Pair of Elliptical Cylinders in Blunt and Slender Situations.

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Last updated: 04 Jan 2025

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Mechanical Power Engineering

Abstract

In this paper, natural convection heat transfer between pairs of elliptical cylinders having different elliptical ratios in blunt and slender situations was studied experimentally and numerically. Three pairs of elliptical cylinders having the same axes ratio of 2 and elliptical ratios of 0.662, 0.866 and 0.968 were cut using CNC wire-cut machining. The tests were carried out by keeping the inner cylinder at a constant heat flux while cooling the outer one. The effects of vertical eccentricity, horizontal eccentricity and angle of attack of the inner cylinder on natural convection for both blunt and slender situations of each pair were stated, Empirical correlation was deduced within acceptable uncertainty for the experimental results. A validated numerical CFD model was conducted with the case study to clarify the thermal behavior of air inside the elliptical annulus space between the two elliptical cylinders. Compatible and satisfactory to the conscience agreement was found in the comparison among present and corresponding previous works. In the vision of the comparison among the results of present work, it was found that the vertical eccentricity can enhance natural convection by about 15% than the concentric case, the horizontal eccentricity can enhance, natural convection by about 10% than concentric case and slender situation leads to about 30% - 40% enhancement in natural convection than the blunt situation for the same elliptical ratio. 

DOI

10.21608/bfemu.2020.126582

Keywords

Elliptical cylinders, blunt, slender, Eccentric, angle of attack and CFD modeling

Authors

First Name

El-Desouki

Last Name

Eid

MiddleName

Ibrahim

Affiliation

Associate Professor., Mechanical Power Engineering Department., Faculty of Industrial Education., Suez Canal University, 43515 Suez., Egypt.

Email

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City

Suez

Orcid

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Volume

34

Article Issue

4

Related Issue

18585

Issue Date

2009-12-01

Receive Date

2009-11-11

Publish Date

2020-11-30

Page Start

1

Page End

15

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 34_Issue 4_Pages 1-15.pdf

PDF . 704.5kB

Link

https://bfemu.journals.ekb.eg/article_126582.html

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https://bfemu.journals.ekb.eg/service?article_code=126582

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

Natural Convection between a Pair of Elliptical Cylinders in Blunt and Slender Situations.

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Type

Article

Created At

22 Jan 2023