Beta
ManageSearchChatDiscover
144809

Heat Transfer in Laminar Pulsating Annular Flow of Drag Reducing Dilute Polymer Solutions.

Article

Last updated: 04 Jan 2025

OverviewSimilar Items

Subjects

-

Tags

Mechanical Power Engineering

Abstract

Heat transfer in pulsating laminar flow is experimentally investigated for the flow of drag reducing polyacrylamide dilute solutions in the annulus of a tubular heat exchanger. Drag reducing polymer solutions flow through the annulus of the tubular heat exchanger, while hot water as a heating source flows steadily through the inner pipe. Different polymer concentrations are considered; 10, 25, 50 and 100 wppm. Experiments are carried out at a flow pulsation of frequency of 1 Hz. This work covers a range of Reynolds number from Re=200 ̶ 1200. Steady and pulsating flows of drag reducing polymer solutions as well as steady and pulsating water flows are considered for the sake of comparison. The data of experimental measurements are supplied to a personal computer via a data acquisition system, for further analysis. 
The results of this work show that for steady laminar annular flow, it is hardly to detect any difference between Nusselt numbers of polymer solution flow and those of water flow. For the pulsating flow of drag reducing polymer solutions, a noticeable increase in Nusselt number of laminar annular flow is found compared with those of steady flow. Such increase in Nusselt number is slightly dependent on Reynolds number, such that for pulsating flow Nu α Re0.55 compared with Nu α Re0.55 for steady flow. When these results are compared with those of the pulsating low of water. a reduction in Nusselt number is found. This means that drag reducing additives dampen the influence of flow pulsation on heat transfer due to the damping of sueh local turbulent eddies produced by drag reducing additives. 
 

DOI

10.21608/bfemu.2021.144809

Keywords

heat transfer, Drag reducing, Laminar, and Pulsating flow

Authors

First Name

Lotfy

Last Name

Rabie

MiddleName

H.

Affiliation

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

Email

-

City

Mansoura

Orcid

-

First Name

Hesham

Last Name

Mostafa

MiddleName

-

Affiliation

Higher Technological Institute., Ramadan Tenth City., Egypt.

Email

dr.heshammostafa@yahoo.com

City

Ramadan Tenth

Orcid

-

Volume

26

Article Issue

2

Related Issue

21250

Issue Date

2001-06-01

Receive Date

2001-02-11

Publish Date

2021-01-30

Page Start

15

Page End

27

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 26_Issue 2_Pages 15-27.pdf

PDF . 131.2kB

Link

https://bfemu.journals.ekb.eg/article_144809.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=144809

Order

13

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

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

MainTitle

Heat Transfer in Laminar Pulsating Annular Flow of Drag Reducing Dilute Polymer Solutions.

Details

Type

Article

Created At

22 Jan 2023