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177190

An Experimental Study for the Flow of Dilute Polymer Solutions in Nozzles and Diffusers.

Article

Last updated: 04 Jan 2025

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Tags

Mechanical Power Engineering

Abstract

This work presents an experimental study for the effect of drag reducing polymer additives upon a water flow in nozzles and diffusers. Five circular nozzles and diffusers of constant area ratio of 4 and half angle α = 4o ,6o , 10o, and 12o respectively are used. Two polymer types; Polyox coagulant and polyacrylamide are used at different concentrations. 
The results show that both polyacrylamide and polyox have no effect on the flow through nozzles at any flow rate and polyner concentrations. However, for diffuser flow, polymer additives results in a substantial increase in the pressure recovery of the diffuser. This effect increases with the flow rate and polymer concentration up to 10 wppm. For higher concentrations as 50 wppm, the effect is complicated and more interesting especially with polyacrylamide additives. The pressure recovery of the diffuser begins to decrease at some value of the flow rate. The decrease becomes more pronounced as the diffuser half angle increases. This is thought to be due to the increase of the viscoelastic properties with con centration and the elongation strains with the flow rate and diffuser half angle. The results also show that the pressure recovery increases with the diffuser half angle. They also show that polymer effect starts at a certain flow rate similar to the onset of drag reduction in pipe flow. 

DOI

10.21608/bfemu.1985.177190

Authors

First Name

Lotfi

Last Name

Rabie

MiddleName

H.

Affiliation

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

Email

-

City

Mansoura

Orcid

-

First Name

B.

Last Name

Khalifa

MiddleName

A.

Affiliation

Faculty of Engineering and Technology., Menofia University., Shebeen El-Koum., Egypt.

Email

-

City

-

Orcid

-

First Name

A.

Last Name

El-Haroun

MiddleName

A.

Affiliation

Faculty of Engineering and Technology., Menofia University., Shebeen El-Koum., Egypt.

Email

-

City

-

Orcid

-

Volume

10

Article Issue

1

Related Issue

25502

Issue Date

1985-06-01

Receive Date

1985-04-16

Publish Date

2021-06-01

Page Start

21

Page End

36

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 10_Issue 1_Pages 21-36.pdf

PDF . 184.4kB

Link

https://bfemu.journals.ekb.eg/article_177190.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=177190

Order

11

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

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

MainTitle

An Experimental Study for the Flow of Dilute Polymer Solutions in Nozzles and Diffusers.

Details

Type

Article

Created At

22 Jan 2023