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Licensed Unlicensed Requires Authentication Published by De Gruyter June 27, 2022

New flow boiling frictional pressure drop multipliers for smooth and microfin tubes

Ali Celen and Ahmet Selim Dalkılıç ORCID logo
From the journal Kerntechnik

Abstract

The accurate calculation of pressure drop of evaporators/condensers are crucial and related with the pumping power, performance coefficient and energy consumption in a refrigeration equipment. This work aligns frictional pressure drop models/correlations with the experimental outcomes of boiling pressure drop of R134a in horizontal smooth and microfin copper tubes with equivalent outer diameter of 9.52 mm. The pressure drop through the test tube is obtained with a differential pressure transducer directly. Effective parameters are specified for smooth and microfin tubes and the most compatible models/correlations, 12 for smooth tubes and 9 for microfin ones, are determined accurately in relation to the consequences of investigation during intermittent and annular flow regime. Moreover, new two-phase multipliers have been developed by using regression analyses of 182 data points based on Lockhart-Martinelli parameter for each test tubes separately, and their predictability are found to be better than others in the literature as novel ones. Average errors of the developed empirical correlations are 11% for smooth and for 7% for microfin tubes. Finally, the measured data is given for the validation issues of researchers who can benefit from most of the investigated pressure drop models with tolerable accuracy regarding with their HEX design analyses.


Corresponding author: Ahmet Selim Dalkılıç, Department of Mechanical Engineering, Heat and Thermodynamics Division, Faculty of Mechanical Engineering, Yildiz Technical University, Yildiz, Besiktas, Istanbul 34349, Turkey, E-mail:

Funding source: Yildiz Teknik Ãœniversitesi

Award Identifier / Grant number: 2013-06-01-KAP01

Acknowledgments

The authors also wish to thank Bilkar Soğutma Isıtma Klima ve Elektrik Malzemeleri San. Tic. Ltd. Şti. in Istanbul-Turkey (http://www.bilkarsogutma.com/) for valuable donation of the microfin tube used in the present study.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This study has been financially supported by Yildiz Technical University Scientific Research Projects Coordination Department, Project Number: 2013-06-01-KAP01.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-02-08
Published Online: 2022-06-27
Published in Print: 2022-08-26

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