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128938

Boiling Heat Transfer in Closed Loop Heat Pipe.

Article

Last updated: 04 Jan 2025

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Subjects

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Tags

Mechanical Power Engineering

Abstract

An experimental study for the boiling heat {transfer in a closed loop heat pipe was achieved by using saturated porous medium instead of pure water in the evaporator section. An experimental test loop equipped with the required measuring devices was designed and constructed to assess the effects of applied heat flux, porosity of porous medium in the evaporator section on the boiling heat transfer process. The tested porous media are balls made from iron coated with nickel. Four porous media are tested, each one consists of balls of diameter 4.73, 3.94, 3.12, and 2.47 mm respectively. The experimental measurements of temperature. pressure and volume flow rate are recorded and manipulated to calculate the boiling heat transfer coefficient and the enhancement factor for the boiling heat transfer coefficient when using porous media instead of water only in the evaporator section of heat pipe, 
The obtained experimental results show that, the evaporator wall temperature was reduced by using porous media compared with water only. Accordingly, the boiling heat transfer coefficient increased for closed loop heat pipe when using porous media and increased also with increasing heat flux. The enhancement factor of the boiling heat transfer coefficient increased with decreasing porosity up to the value of 0.4 then it decreased. The optimum operating conditions for the studied closed loop heat pipe when using porous media in the evaporator section al porosity about 0.4 and heat flux about 38600 W/m2 There. the enhancement factor lakes the highest value equal to about 2.5. Comparison with the previous work gave the same trend

DOI

10.21608/bfemu.2020.128938

Keywords

Closed loop heat pipe, Porous medium, Boiling heat transfer

Authors

First Name

Hesham

Last Name

Mostafa

MiddleName

-

Affiliation

Assistant Professor., Mechanical Engineering Department., Higher Technological Institute., Tenth of Ramadan City., Egypt.

Email

mostafa@yahoo.com

City

Tenth of Ramadan

Orcid

-

First Name

Kamel

Last Name

Abd_elsalam

MiddleName

-

Affiliation

Professor of Mechanical Engineering Department., Higher Technological Institute., Tenth of Ramadan City., Egypt.

Email

-

City

Tenth of Ramadan

Orcid

-

Volume

32

Article Issue

4

Related Issue

19078

Issue Date

2007-12-01

Receive Date

2007-09-11

Publish Date

2020-12-01

Page Start

1

Page End

12

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 32_Issue 4_Pages 1-12.pdf

PDF . 446.3kB

Link

https://bfemu.journals.ekb.eg/article_128938.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=128938

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/

MainTitle

Boiling Heat Transfer in Closed Loop Heat Pipe.

Details

Type

Article

Created At

22 Jan 2023