Effect of Wavy (Corrugated) Twisted Tape Inserts on Heat Transfer in a double Pipe Heat Exchanger
Main Article Content
Abstract
re experimentally investigated by using copper
wavy (corrugated) twisted tape inserts. The turbulent flow w
as created by inserting the wavy twisted tape inserts
into the inner tube of heat exchanger creating high rate of t
urbulence in pipe, which results in increasing heat
transfer enhancement and pressure drop. The tape consists of the cor
rugations and the twisting with various twist
ratios (TR=10.7, 8.5, 7.1). The length and width of insert was 1 meter an
d 14 mm respectively. The outer tube of
heat exchanger is made up of mild steel with outside diameter
0.0198 m & 0.0142 m inside diameter and the inner
tube is made up of copper with 0.038 m outside diameter and 0.032 m inside di
ameter. The length of pipe in pipe
heat exchanger is 1.4 m. The bulk mean temperatures at various posit
ions are used for different flow rate of water.
From the obtained results the new Correlations for Nusselt number and
friction factor are developed for twisted
tape inserts. The Reynolds number is varied from 5000 to 17000. The results
of varying twists in wavy twisted
tape inserts with different pitches have been compared with the val
ues for the smooth tube. It showed that the
highest heat transfer rate was achieved for the wavy twis
ted tape with twist ration 7.1. The Nusselt number value
increased by 172 % and friction factor value increased by 32.11% as compared to the sm
ooth tube values.
Downloads
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0 DEED).
You are free to:
- Share — copy and redistribute the material in any medium or format
- The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
- Attribution — You must give appropriate credit , provide a link to the license, and indicate if changes were made . You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- NonCommercial — You may not use the material for commercial purposes .
- NoDerivatives — If you remix, transform, or build upon the material, you may not distribute the modified material.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
Notices:
You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation .
No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.
Rights of Authors
Authors retain the following rights:
1. Copyright and other proprietary rights relating to the article, such as patent rights,
2. the right to use the substance of the article in future works, including lectures and books,
3. the right to reproduce the article for own purposes, provided the copies are not offered for sale,
4. the right to self-archive the article.