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Thermal Performance Evaluation of a Tubular Heat Exchanger Fitted with Combined Basket–Twisted Tape Inserts

Khafaji, Hayder Q. A. ; Abdul Wahhab, Hasanain Adnan ; Alsaedi, Sajda S. ; Al-Maliki, Wisam Abed Kattea ; Alobaid, Falah ; Epple, Bernd (2022)
Thermal Performance Evaluation of a Tubular Heat Exchanger Fitted with Combined Basket–Twisted Tape Inserts.
In: Applied Sciences, 2022, 12 (10)
doi: 10.26083/tuprints-00021373
Article, Secondary publication, Publisher's Version

Abstract

Features of the tubular type of heat exchanger were examined experimentally in the current study. A rig is fitted with a novel insert as a negative heat transfer increase technique. The core fluid used is air under steady heat flux and a turbulent discharge state (6000 ≤ Re ≤ 19,500) conditions. Two heat transfer augmentation inserts are employed; one is the basket turbulators utilized as a turbulator and placed inside the heat exchanger with a constant pitch ratio (PR = 150 mm), and the other is the basket turbulators together with twisted tape that are installed at the core of the basket turbulators. The measurements illustrated that the Nusselt number (Nu) was found to be higher by about 131.8%, 169.5%, 187.7%, and 206.5% in comparison with the plain heat exchanger for basket turbulators and the combined basket–twisted tape inserts with y/w = 6, 3, and 2, respectively. The highest thermal efficiency factor of the increased tubular heat exchanger is 1.63 times more elevated than that of the simple heat exchanger on average, due to a binary basket-quirky strip for a twisting percentage y/w equal to 2 under steady pumping energy. Further, practical correlations for the Nusselt number, as well as friction characteristics, were established and presented.

Item Type: Article
Erschienen: 2022
Creators: Khafaji, Hayder Q. A. ; Abdul Wahhab, Hasanain Adnan ; Alsaedi, Sajda S. ; Al-Maliki, Wisam Abed Kattea ; Alobaid, Falah ; Epple, Bernd
Type of entry: Secondary publication
Title: Thermal Performance Evaluation of a Tubular Heat Exchanger Fitted with Combined Basket–Twisted Tape Inserts
Language: English
Date: 2022
Year of primary publication: 2022
Publisher: MDPI
Journal or Publication Title: Applied Sciences
Volume of the journal: 12
Issue Number: 10
Collation: 13 Seiten
DOI: 10.26083/tuprints-00021373
URL / URN: https://tuprints.ulb.tu-darmstadt.de/21373
Corresponding Links:
Origin: Secondary publication via sponsored Golden Open Access
Abstract:

Features of the tubular type of heat exchanger were examined experimentally in the current study. A rig is fitted with a novel insert as a negative heat transfer increase technique. The core fluid used is air under steady heat flux and a turbulent discharge state (6000 ≤ Re ≤ 19,500) conditions. Two heat transfer augmentation inserts are employed; one is the basket turbulators utilized as a turbulator and placed inside the heat exchanger with a constant pitch ratio (PR = 150 mm), and the other is the basket turbulators together with twisted tape that are installed at the core of the basket turbulators. The measurements illustrated that the Nusselt number (Nu) was found to be higher by about 131.8%, 169.5%, 187.7%, and 206.5% in comparison with the plain heat exchanger for basket turbulators and the combined basket–twisted tape inserts with y/w = 6, 3, and 2, respectively. The highest thermal efficiency factor of the increased tubular heat exchanger is 1.63 times more elevated than that of the simple heat exchanger on average, due to a binary basket-quirky strip for a twisting percentage y/w equal to 2 under steady pumping energy. Further, practical correlations for the Nusselt number, as well as friction characteristics, were established and presented.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-213737
Additional Information:

This article belongs to the Special Issue Thermochemical Conversion Processes for Solid Fuels and Renewable Energies: Volume II (s. verwandtes Werk).

Keywords: heat transfer enhancement; binary basket–twisted strip inserts; friction characteristics; thermal performance characteristics; turbulent flow

Classification DDC: 600 Technology, medicine, applied sciences > 600 Technology
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institut für Energiesysteme und Energietechnik (EST)
Date Deposited: 17 May 2022 12:36
Last Modified: 18 May 2022 04:48
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